Dodge Pickup D150 1990 - 1990 ENGINE PERFORMANCE Self-Diagnostics - 3.9L, 5.2L & 5.9L TBI Models

Dodge Pickup D150 1990 - INTRODUCTION

If no faults were found while performing the Basic Diagnostic Procedures in the BASIC TESTING article, proceed with ENTERING ON-BOARD DIAGNOSTICS in this article. If no fault codes or only pass codes are present, proceed to TESTS W/O CODES article in this section for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).

Dodge Pickup D150 1990 - MODEL IDENTIFICATION

Dodge Pickup D150 1990 VEHICLE BODY IDENTIFICATION

Model Name	(1) Body Type
Dakota	AN
Pickup & Ramcharger	AD
Van	AB
(1) Some trouble shooting charts refer to body type without the "A" prefix.

Dodge Pickup D150 1990 - SYSTEM DIAGNOSIS INTRODUCTION

The self-diagnostic capabilities of this system, if used properly, can simplify testing. The Single Board Engine Controller (SBEC) monitors several different engine control system circuits.

If a problem is sensed with a monitored circuit, a fault code is stored in the SBEC, the CHECK ENGINE light illuminates and SBEC enters limp-in mode. In limp-in mode, SBEC compensates for component failure by substituting information from other sources. This allows vehicle operation until repairs can be made.

Once codes are known, refer to FAULT CODES listed in this article to determine the questionable circuit. Test circuits and repair or replace components as required. If a problem is repaired or no longer exists, SBEC cancels fault code after 50 ignition on/off cycles. To clear codes, refer to CLEARING CODES in this article.

A specific fault code indicates a particular system failure, but it DOES NOT indicate that cause of failure is necessarily within system. The fault code DOES NOT condemn any specific component; it simply points out a probable malfunctioning area.

Dodge Pickup D150 1990 - HARD FAILURES

Hard failures cause CHECK ENGINE light to illuminate and remain on until malfunction is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, SBEC will use a substitute value in its calculations, allowing engine operation in limp-in mode. In this condition, vehicle will run but driveability may be poor.

Dodge Pickup D150 1990 - INTERMITTENT FAILURES

Intermittent failures may cause malfunction light to flicker or stay on until intermittent fault goes away. The corresponding trouble code, however, will be retained in SBEC memory. If fault does not reoccur within a certain time frame, trouble code will be erased from SBEC memory. Intermittent failures can be caused by faulty sensor, bad connector or other wiring-related problems. See INTERMITTENTS in TESTS W/O CODES article in this section.

Dodge Pickup D150 1990 - DIAGNOSTIC PROCEDURE

- ENTERING ON-BOARD DIAGNOSTICS to retrieve fault codes. If fault codes are NOT present and/or Diagnostic Readout Box II (DRB-II) is used, proceed to one of the following tests:

• Go to NO START TESTS 1 (NS1) chart if a no-start condition exists or engine stalls after start-up. Perform indicated VERIFICATION PROCEDURE chart after repairs. Ensure charts apply to engine being tested.
• Go to DRIVEABILITY TESTS 1 (DR1) chart if engine runs but has performance problems. Perform indicated VERIFICATION PROCEDURE chart after repairs. Ensure charts apply to engine being tested.

NOTE:

When using trouble shooting charts for diagnosis, DO NOT skip any steps in chart or incorrect diagnosis may result.

Before proceeding with diagnosis, the following precautions must be followed:

• Vehicle must have a fully charged battery and functional charging system.
• Probe SBEC connector from pin side. DO NOT backprobe SBEC connector.
• DO NOT cause short circuits when performing electrical tests. This will set additional fault codes, making diagnosis of original problem more difficult.
• DO NOT use a test light in place of a voltmeter.
• When checking for spark, ensure coil wire is NO more than 1/4" from ground. If coil wire is more than 1/4" from ground, damage to vehicle electronics and/or SBEC may result.
• DO NOT prolong testing of fuel injectors or engine may hydrostatically (liquid) lock.
• Always repair lowest fault code number (CHECK ENGINE light) or first fault displayed (DRB-II) first.
• Always perform verification test after repairs are made.

Dodge Pickup D150 1990 - ENTERING ON-BOARD DIAGNOSTICS

NOTE:

Manufacturer recommends using DRB-II (Diagnostic Readout Box-II, C-4805) to diagnose the system. CHECK ENGINE light function has limited diagnostic usage.

Dodge Pickup D150 1990 - "CHECK ENGINE" LIGHT DIAGNOSTIC MODE

1. Start engine (if possible). Move transmission shift lever through all positions, ending in Park. Turn A/C switch on, then off (if equipped).
2. Turn engine off. Without starting engine again, turn ignition on, off, on, off and on. Record 2-digit fault codes as displayed by the flashing CHECK ENGINE light.
3. For example, Code 23 is displayed as flash, flash, 4-second pause, flash, flash, flash. After a slightly longer pause, other codes stored are displayed in numerical order.
4. Once CHECK ENGINE light begins to flash fault codes, it cannot be stopped. If you lose count, it will be necessary to start over. Code 55 indicates end of fault code display.
5. - FAULT CODES to translate fault code number to a system fault description (DRB-II display). Once trouble area is identified, refer to appropriate NO START TESTS or DRIVEABILITY TESTS trouble shooting chart to diagnose problem for specific engine.

NOTE:

When using trouble shooting charts for diagnosis, DO NOT skip any steps in chart or incorrect diagnosis may result.

Dodge Pickup D150 1990 - DRB-II DIAGNOSTIC MODE

1. Turn ignition off. Attach DRB-II Tester (C-4805) to diagnostic connector.
2. On Dakota, diagnostic connector is located in engine compartment, on right corner of firewall. See Fig. 1 and Fig. 3 .
3. On Pickup, Ramcharger and Van, diagnostic connector is located in engine compartment, on left side of master cylinder. See Fig. 1 and Fig. 4 .
4. Start engine (if possible). With foot on brake, move transmission shift lever through all positions, ending in Park. Turn A/C switch on, then off (if equipped).
5. Turn engine off. Without starting engine again, turn ignition on. Enter vehicle model year and engine size. Read fault data on DRB-II. - appropriate NO START TESTS or DRIVEABILITY TESTS trouble shooting chart for specific engine.

NOTE:

When using trouble shooting charts for diagnosis, DO NOT skip any steps in chart or incorrect diagnosis may result.

NOTE:

Actuator, sensor, solenoid and switch tests available on DRB-II will vary depending on engine, transaxle and emission packages.

Dodge Pickup D150 1990 - START COUNTER

1. Start counter appears at bottom of fault message on DRB-II to show number of engine starts since fault last occurred. This helps determine if fault is intermittent. As an example, if DRB-II displays 0 SINCE THIS FAULT, it indicates zero engine start since fault occurred, and fault is NOT intermittent. If start counter on DRB-II shows more than zero engine start since fault last occurred, then fault is intermittent.
2. Memory space limits start counter to first 3 faults. If more than 3 faults are stored, start counter will display third fault with a 3 +.

Dodge Pickup D150 1990 - FAULT COUNTER

1. A fault counter will appear along with fault displayed on DRB-II. As an example, DRB-II will display #1 OF 2 FAULTS to indicate this is one of two faults stored. SBEC will store up to 8 fault messages. Faults are numbered in reverse order of setting.
2. The most recent fault to occur will be number one. Vehicles without air conditioning will always have A/C CLUTCH RELAY CKT (circuit) stored in memory. This fault will always be number one if vehicle is not equipped with that option.
3. If no fault messages are stored, DRB-II will display NO FAULTS, with start counter reading SINCE LAST ERASED. When no faults are stored, start counter will reach a maximum of 255.

Dodge Pickup D150 1990 - DRB-II SWITCH TEST MODE

The SBEC can only recognize high and low states on switch circuits. SBEC cannot tell the difference between an open or short circuit or a defective switch. The DRB-II display must change between INPUT HIGH and INPUT LOW.

Dodge Pickup D150 1990 - DRB-II READ INPUT STATES

This mode on DRB-II allows technician to read input states of Z1 voltage sense, park/neutral switch, brake switch, A/C switch, speed control resume, on/off and set switches. DRB-II will display INPUT HIGH or INPUT LOW as SBEC senses component status changing.

Dodge Pickup D150 1990 - DRB-II READ OUTPUT STATES

This mode on DRB-II allows technician to read output states of speed control vacuum solenoid, purge solenoid, A/C clutch relay, radiator fan relay, ASD relay, CHECK ENGINE light, speed control vent solenoid and EGR solenoid. DRB-II will display ENERGIZED or DE-ENERGIZED as SBEC senses component status changing.

Dodge Pickup D150 1990 - DRB-II ACTUATES SOLENOIDS & RELAYS

This state on DRB-II allows SBEC to actuate radiator fan relay, A/C clutch relay, ASD relay, purge solenoid, speed control servo solenoids and EGR solenoid. With tester in this state, SBEC can also actuate all solenoids and relays simultaneously. This test allows technician to observe components in operation.

Dodge Pickup D150 1990 - DRB-II ACTUATES OUTPUTS

This mode on DRB-II allows SBEC to actuate ignition coil, fuel injectors (#1), fuel injectors (#2), fuel injectors (#3), AIS motor open and close, alternator field, tachometer output and fuel monitor signal. During this test DRB-II will read ACTUATING.

Dodge Pickup D150 1990 - DRB-II READ SENSOR VOLTAGES

This mode on DRB-II allows technician to read battery temperature sensor, oxygen sensor, coolant temperature sensor, TPS sensor, minimum throttle in volts, knock sensor, battery voltage and MAP sensor.

Dodge Pickup D150 1990 - DRB-II READ SENSOR VALUES

This mode on DRB-II allows technician to read coolant temperature in degrees Fahrenheit or Centigrade, manifold pressure in inches of vacuum or kilopascals, AIS motor in steps, adaptive fuel factor in percent, barometric pressure in inches of mercury or kilopascals, engine speed in RPM, SBEC spark advance in degrees, vehicle speed in MPH and oxygen sensor state given as center, rich or lean.

Dodge Pickup D150 1990 - DRB-II ENGINE PARAMETERS

This mode on DRB-II allows technician to read engine RPM, total spark advance, MAP reading, barometric pressure, AIS motor, battery voltage and adaptive fuel factor.

Dodge Pickup D150 1990 - DRB-II SET ENGINE RPM

This mode on DRB-II allows technician to set engine RPM at a fixed speed from 900-2000 RPM, in increments of 100. This allows accuracy of AIS motor control to be checked.

Dodge Pickup D150 1990 - DRB-II EMISSIONS EMR TESTS

This mode on DRB-II allows technician to reset emission reminder light and mileage.

Dodge Pickup D150 1990 - DRB-II READ MODULE INFORMATION

This mode on DRB-II allows technician to read SBEC part number and application.

Dodge Pickup D150 1990 - DRB-II SYSTEM MONITORS

This mode on DRB-II allows technician to read fuel control monitor, charging monitor, RPM monitor, speed control status, engine knock retard, boost monitor, secondary indicators, adaptive fuel factor, theft alarm status and DIS signal status.

Dodge Pickup D150 1990 - DRB-II SPECIAL FUNCTIONS

This mode on DRB-II allows technician to actuate ASD fuel system test, minimum airflow idle speed and reset memory. When reset memory is selected, adaptive fuel, AIS counter, minimum throttle, erase fault data and reset all values can be selected.

Dodge Pickup D150 1990 - DRB-II PROBLEMS & ERROR MESSAGES BLANK MESSAGE SCREEN

1. Connect DRB-II to a different vehicle. If message screen is still blank, DRB-II or cable adapter are faulty. Substitute to find faulty component. If message screen is not blank, DRB-II and cable adapter are functioning properly.
2. Inspect diagnostic connector for proper wire placement, damaged terminals or pushed out pins. Repair as necessary. If connector is okay, using an ohmmeter, check Black/White ground wire of diagnostic connector for continuity to ground. Repair as necessary.

Fig. 1: Dodge Pickup D150 1990 - Component Locations - Identifying Diagnostic Connector Terminals

Fig. 2: Dodge Pickup D150 1990 - Component Locations - Diagnostic Connector Location (Caravan, Town & Country, & Voyager)

Fig. 3: Dodge Pickup D150 1990 - Component Locations - Diagnostic Connector Location (Dakota)

Fig. 4: Dodge Pickup D150 1990 - Component Locations - Diagnostic Connector Location (Pickup, Ramcharger & Van)

Dodge Pickup D150 1990 - NO RESPONSE MESSAGE

1. Ensure ignition is turned on. Disconnect SBEC 60-pin connector. Using an ohmmeter, check Pink wire of appropriate diagnostic connector for continuity to SBEC 60-pin connector cavity No. 25. See Fig. 5 & Fig. 6 .
2. Check Light Green wire of appropriate diagnostic connector for continuity to SBEC 60-pin connector cavity No. 45. SeeFig. 5 & Fig. 6 . If continuity is not present, repair circuit as necessary. If continuity is present, replace SBEC. Attempt retest.

Dodge Pickup D150 1990 - RAM TEST FAILURE MESSAGE

Replace DRB-II.

Dodge Pickup D150 1990 - CARTRIDGE ERROR MESSAGE

Replace DRB-II cartridge.

Dodge Pickup D150 1990 - KEY PAD TEST FAILURE MESSAGE

Power up DRB-II again with fingers off the keypad. If error message returns, replace DRB-II.

Dodge Pickup D150 1990 - HIGH OR LOW BATTERY MESSAGE

Correct condition of vehicle battery and reconnect DRB-II.

Dodge Pickup D150 1990 - DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATIONS

Dodge Pickup D150 1990 DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATIONS

CODE	DISPLAY ON DRB-II	FAULT CONDITION
11	IGN REFERENCE SIGNAL	No Distributor Reference Signal Picked Up During Cranking.
12	Number of key-ons since last fault or since faults were erased	Direct Battery Input To SMEC Was Disconnected Within Last 50-100 Ignition Key-Ons.
13	MAP PNEUMATIC SIGNAL or	No Difference In MAP Sensor Signal Is Detected.
13	MAP PNEUMATIC CHANGE	No Difference Is Detected Between MAP Reading And Stored Barometric Pressure Reading.
14	MAP VOLTAGE TOO LOW	MAP Sensor Input Less Than Minimum Acceptable Voltage.
14	MAP VOLTAGE TOO HIGH	MAP Sensor Input More Than Maximum Acceptable Voltage.
15	VEHICLE SPEED SIGNAL	No Distance Sensor Signal Detected With Road Load Conditions.
16	BATTERY INPUT SENSE	Battery Voltage Sense Input Not Detected With Engine Running.
17	LOW ENGINE TEMP	Coolant Temp. Stays Below Normal Operating Temp. During Vehicle Operation.
21	OXYGEN SENSOR SIGNAL	No Rich Or Lean Signal Detected From O2 Sensor Input.
21	OXYGEN SENSOR SIGNAL	No Rich Or Lean Signal Detected From O2 Sensor Input.
22	COOLANT VOLTAGE LOW	Coolant Temp. Sensor Input Below Minimum Acceptable Voltage.
22	COOLANT VOLTAGE HIGH	Coolant Temp. Sensor Input Above Maximum Acceptable Voltage.
23	T/B TEMP VOLTAGE LOW	Throttle Body Temp. Sensor Input Less Than Minimum Acceptable Voltage.
23	T/B TEMP VOLTAGE HI	Throttle Body Temp. Sensor Input More Than Maximum Acceptable Voltage.
24	TPS VOLTAGE LOW	TPS Sensor Output Less Than Minimum Acceptable Voltage.
24	TPS VOLTAGE HIGH	TPS Sensor Output More Than Maximum Acceptable Voltage.
25	AIS MOTOR CIRCUITS	Shorted Condition Detected In One Or More AIS Control Circuits.
26	INJ 1 PEAK CURRENT	High Resistance Detected In Injector Output Circuit.
27	INJ 1 CONTROL CIRCUIT	Injector Output Driver Stage Does Not Respond Correctly To SMEC Control Signal.
31	PURGE SOLENOID CKT	Open Or Shorted Condition Is Detected In Purge Solenoid Circuit.
32	EGR SOLENOID CIRCUIT	Open Or Short Is Detected In EGR Solenoid Circuit (CA Only).
32	EGR SYSTEM FAILURE	SMEC Did Not Detect Required Air/Fuel Change During Diagnostic Test (CA Only).
33	A/C CLUTCH RELAY CKT	Open Or Shorted Condition Detected In A/C Clutch Relay Circuit.
34 (1)	S/C SERVO SOLENOIDS	Open Or Shorted Condition Detected In Speed Control Vacuum Or Vent Solenoid Circuits.
35	RADIATOR FAN RELAY	Open Or Shorted Condition Detected In Radiator Fan Relay Circuit.
35	RADIATOR FAN RELAY	Open Or Shorted Condition Detected In Radiator Fan Relay Circuit.
36	AIR SWITCH SOLENOID CIRCUIT	Open Or Shorted Condition Detected In Radiator Fan Relay Circuit.
37	PTU SOLENOID CIRCUIT	Open Or Shorted Condition Detected In Torque Converter Part Throttle Unlock Solenoid Circuit (Dakota Only).
37	PTU SOLENOID CIRCUIT	Open Or Shorted Condition Detected In Torque Converter Part Throttle Unlock Solenoid Circuit (Dakota Only).
41	CHARGING SYSTEM CKT	Output Driver Stage Does Not Respond Correctly To Voltage Regulator Control Signal.
42	ASD RELAY CIRCUIT	Open Or Shorted Condition Detected In ASD Relay Circuit.
43	IGNITION CONTROL CIRCUIT	Output Driver Stage For Ignition Coil Does Not Respond Properly To Dwell Control Signal.
44	FJ2 VOLTAGE SENSE	No FJ2 Voltage Present At Logic Board During SMEC Operation.
45	OVERDRIVE SOLENOID	Open Or Shorted Condition Detected In Radiator Fan Relay Circuit.
46	BATTERY VOLTAGE HIGH	Battery Voltage Sense Input More Than Target Charging Voltage During Engine Operation.
47	BATTERY VOLTAGE LOW	Battery Voltage Sense Input Less Than Target Charging Voltage During Engine Operation.
51	LEAN F/A CONDITION	O2 Sensor Input Indicates Lean Air/Fuel Ratio During Engine Operation.
52	RICH F/A CONDITION	O2 Sensor Input Indicates Rich Air/Fuel Ratio During Engine Operation.
52	EXCESSIVE LEANING	Adaptive Fuel Value Leaned Excessively From A Sustained Rich Condition.
53	INTERNAL SELF-TEST	SMEC Detects Internal Failure. Completion Of Fault Code Display By Check Engine Light.
62	EMR MILEAGE ACCUM	Attempt Is Unsuccessful To Update EMR Mileage In SMEC EEPROM.
63	EEPROM WRITE DENIED	Attempt Is Unsuccessful To Write To An EEPROM Location By SMEC.
N/A	FAULT CODE ERROR	DRB-II Does Not Recognize Fault ID.
(1) Diagnostics for Code 34 are not available from manufacturer.

Dodge Pickup D150 1990 - EMISSION MAINTENANCE REMINDER (EMR) MILEAGE TRANSFER

NOTE:

Not all aftermarket scan testers can perform this function. Check tester operating manual for more information.

1. When SBEC is replaced, vehicle mileage must be copied from odometer to a replacement SBEC memory. Transfer of vehicle mileage will enable new SBEC to operate EMR light properly.
2. Using DRB-II (C-4805), enter EMISSIONS EMR TESTS. Press YES key. Select test item EMR MEMORY CHECK. Press YES key. DRB-II will read EMR MEMORY CHECK ARE YOU SURE? YES,NO. Press YES key.
3. DRB-II will display IS INSTRUMENT PANEL MILEAGE BETWEEN 9953 AND 10051? If vehicle mileage is within specification, EMR memory check is complete. Press YES key. If vehicle mileage is not within specification, go to next step.
4. Press NO key. DRB-II will display DO YOU WANT TO CORRECT EMR MILEAGE? Press YES key. DRB-II will display ENTER MILEAGE SHOWN ON INSTRUMENT PANEL USE ENTER KEY TO END.
5. Enter vehicle mileage. DO NOT enter tenths. When correct vehicle mileage is entered, press ENTER key. DRB-II will ask for verification of mileage entry. If mileage entry was accurate, press ENTER key. DRB-II will display EMR MEMORY CHECK TEST COMPLETE. Vehicle must travel at least 8 miles for reset to occur.

Dodge Pickup D150 1990 - EMISSION MAINTENANCE REMINDER LIGHT RESET PROCEDURE EMISSION MAINTENANCE REMINDER (EMR) LIGHT RESET PROCEDURE

1. The Emission Maintenance Reminder (EMR) light is designed to be a reminder to service the vehicle emissions control system. It is not an emissions warning system, only a reminder to perform emissions servicing.
2. The components to be serviced include PCV valve, oxygen sensor and some vacuum-operated components. EMR light will illuminate after a predetermined mileage.
3. Using DRB-II, select EMISSIONS EMR TESTS. Select EMR MEMORY CHECK. Press F1 or F2 key on DRB-II until display reads RESET EMR LIGHT. Press YES key.
4. Display will read RESET EMR LIGHT ARE YOUR SURE? YES, NO. Press YES key. When DRB-II is finished resetting, EMR light display will read EMR LIGHT RESET.

Dodge Pickup D150 1990 - CLEARING CODES

Using DRB-II, select test ERASE FAULT DATA. Press YES key on DRB-II. DRB-II will display ARE YOU SURE? YES, NO. Press YES key on tester. Tester will display ERASING FAULT DATA X. When DRB-II is finished erasing fault codes, it will display FAULT DATA ERASED.

If DRB-II is not available, fault codes may be cleared by disconnecting negative battery cable for at least 15 seconds, allowing SBEC to clear fault codes.

Fig. 5: Dodge Pickup D150 1990 - Component Locations - 3.9L, 5.2L & 5.9L TBI SBEC 60-Pin Connector Terminal I.D.

Dodge Pickup D150 1990 - CODE CHART INFORMATION

NOTE:

Some trouble shooting charts refer to body type without the "A" prefix. See VEHICLE BODY IDENTIFICATION at the beginning of this article.

NOTE:

The following trouble shooting charts and illustrations are courtesy of Chrysler Motors.

Dodge Pickup D150 1990 - NO START TESTS NS1: CHECK FOR IGN SPARK & POWER FEED TO COIL

Fig. 6: Dodge Pickup D150 1990 - Component Locations - NS1: Circuit Diagram

Fig. 7: Dodge Pickup D150 1990 - Component Locations - NS1: Flow Chart (1 of 3)

Fig. 8: Dodge Pickup D150 1990 - Component Locations - NS1: Flow Chart (2 of 3)

Fig. 9: Dodge Pickup D150 1990 - Component Locations - NS1: Flow Chart (3 of 3)

Dodge Pickup D150 1990 - NS2: CHECK FOR FUEL SPRAY & FAULT MESSAGES W/DRB-II

Fig. 10: Dodge Pickup D150 1990 - Component Locations - NS2: Flow Chart

Dodge Pickup D150 1990 - NS3: CHECKING FOR INJECTOR FAULTS & THEFT STATUS

Fig. 11: Dodge Pickup D150 1990 - Component Locations - NS3: Flow Chart (1 of 2)

Fig. 12: Dodge Pickup D150 1990 - Component Locations - NS3: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - NS4: CHECK FOR FUEL PRESSURE, TPS & POWER FEED TO INJECTORS

Fig. 13: Dodge Pickup D150 1990 - Component Locations - NS4: Circuit Diagram & Flow Chart (1 of 2)

Fig. 14: Dodge Pickup D150 1990 - Component Locations - NS4: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - NS5: CHECKING FOR WET PLUGS, VALVE GEAR & IGN TIMING

Fig. 15: Dodge Pickup D150 1990 - Component Locations - NS5: Circuit Diagram

Fig. 16: Dodge Pickup D150 1990 - Component Locations - NS5: Flow Chart

Dodge Pickup D150 1990 - NS6: FUEL FILTER, PUMP, REGULATOR & POWER TO PUMP CHECK FUEL FILTER, FUEL PUMP, PRESSURE REGULATOR & POWER TO FUEL PUMP

Fig. 17: Dodge Pickup D150 1990 - Component Locations - NS6: Circuit Diagram

Fig. 18: Dodge Pickup D150 1990 - Component Locations - NS6: Flow Chart (1 of 2)

Fig. 19: Dodge Pickup D150 1990 - Component Locations - NS6: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - NS7: INJECTORS, FUEL LINES & REGULATOR OPERATION CHECK FOR FLOODING FUEL INJ., KINKED FUEL LINES & PRESSURE REG. OPERATION

Fig. 20: Dodge Pickup D150 1990 - Component Locations - NS7: Circuit Diagram

Fig. 21: Dodge Pickup D150 1990 - Component Locations - NS7: Flow Chart (1 of 2)

Fig. 22: Dodge Pickup D150 1990 - Component Locations - NS7: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - NS8: CHECKING HIGH FUEL PRESSURE AT REGULATOR & TANK CHECKING FOR HIGH FUEL PRESSURE AT PRESSURE REGULATOR & FUEL TANK

Fig. 23: Dodge Pickup D150 1990 - Component Locations - NS8: Circuit Diagram

Fig. 24: Dodge Pickup D150 1990 - Component Locations - NS8: Circuit Diagram & Flow Chart

Dodge Pickup D150 1990 - NS9: CHECK FOR DEFECTIVE COIL OR CONTROL CIRCUITRY

Fig. 25: Dodge Pickup D150 1990 - Component Locations - NS9: Circuit Diagram

Fig. 26: Dodge Pickup D150 1990 - Component Locations - NS9: Flow Chart (1 of 2)

Fig. 27: Dodge Pickup D150 1990 - Component Locations - NS9: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - NS10: CHECK INJECTOR, CONTROL CIRCUIT & ENG CONTROLLER

Fig. 28: Dodge Pickup D150 1990 - Component Locations - NS10: Circuit Diagram

Fig. 29: Dodge Pickup D150 1990 - Component Locations - NS10: Flow Chart (1 of 3)

Fig. 30: Dodge Pickup D150 1990 - Component Locations - NS10: Flow Chart (2 of 3)

Fig. 31: Dodge Pickup D150 1990 - Component Locations - NS10: Flow Chart (3 of 3)

Dodge Pickup D150 1990 - NS11: CHECKING DRB-II & SYSTEM FAULTS

Fig. 32: Dodge Pickup D150 1990 - Component Locations - NS11: Flow Chart

Dodge Pickup D150 1990 - NS12: SYSTEM POWER & GROUND, MAP SENSOR & CONTROLLER CHECK FOR SYSTEM POWER & GROUND, OPERATION OF MAP SENSOR & ENGINE CONTROLLER

Fig. 33: Dodge Pickup D150 1990 - Component Locations - NS12: Circuit Diagram

Fig. 34: Dodge Pickup D150 1990 - Component Locations - NS12: Flow Chart (1 of 2)

Fig. 35: Dodge Pickup D150 1990 - Component Locations - NS12: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - NS13: CODE 11 "IGN REFERENCE SIGNAL"

Fig. 36: Dodge Pickup D150 1990 - Component Locations - NS13: Circuit Diagram

Fig. 37: Dodge Pickup D150 1990 - Component Locations - NS13: Flow Chart (1 of 3)

Fig. 38: Dodge Pickup D150 1990 - Component Locations - NS13: Flow Chart (2 of 3)

Fig. 39: Dodge Pickup D150 1990 - Component Locations - NS13: Flow Chart (3 of 3)

Dodge Pickup D150 1990 - NS14: CODE 42 "ASD RELAY CIRCUIT"

Fig. 40: Dodge Pickup D150 1990 - Component Locations - NS14: Circuit Diagram

Fig. 41: Dodge Pickup D150 1990 - Component Locations - NS14: Flow Chart

Dodge Pickup D150 1990 - NS15: ASD RELAY, POWER TO PUMP, O2 SENSOR & INJECTORS CHECKING ASD RELAY, POWER FEED TO FUEL PUMP, O2 SENSOR & INJECTORS

Fig. 42: Dodge Pickup D150 1990 - Component Locations - NS15: Circuit Diagram

Fig. 43: Dodge Pickup D150 1990 - Component Locations - NS15: Flow Chart (1 of 2)

Fig. 44: Dodge Pickup D150 1990 - Component Locations - NS15: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DRIVEABILITY TESTS DR1: CHECKING SYSTEM FOR FAULTS

Fig. 45: Dodge Pickup D150 1990 - Component Locations - DR1: Flow Chart (1 of 5)

Fig. 46: Dodge Pickup D150 1990 - Component Locations - DR1: Flow Chart (2 of 5)

Fig. 47: Dodge Pickup D150 1990 - Component Locations - DR1: Flow Chart (3 of 5)

Fig. 48: Dodge Pickup D150 1990 - Component Locations - DR1: Flow Chart (4 of 5)

Fig. 49: Dodge Pickup D150 1990 - Component Locations - DR1: Flow Chart (5 of 5)

Dodge Pickup D150 1990 - DR2: CODE 13 "MAP PNEUMATIC SIGNAL"

Fig. 50: Dodge Pickup D150 1990 - Component Locations - DR2: Circuit Diagram

Fig. 51: Dodge Pickup D150 1990 - Component Locations - DR2: Flow Chart

Dodge Pickup D150 1990 - DR3: CODE 13 "MAP PNEUMATIC CHANGE"

Fig. 52: Dodge Pickup D150 1990 - Component Locations - DR3: Circuit Diagram

Fig. 53: Dodge Pickup D150 1990 - Component Locations - DR3: Flow Chart

Dodge Pickup D150 1990 - DR4: CODE 14 "MAP VOLTAGE TOO LOW"

Fig. 54: Dodge Pickup D150 1990 - Component Locations - DR4: Circuit Diagram

Fig. 55: Dodge Pickup D150 1990 - Component Locations - DR4: Flow Chart

Dodge Pickup D150 1990 - DR5: CODE 14 "MAP VOLTAGE TOO HIGH"

Fig. 56: Dodge Pickup D150 1990 - Component Locations - DR5: Circuit Diagram

Fig. 57: Dodge Pickup D150 1990 - Component Locations - DR5: Flow Chart

Dodge Pickup D150 1990 - DR6: CODE 15 "VEHICLE SPEED SIGNAL"

Fig. 58: Dodge Pickup D150 1990 - Component Locations - DR6: Circuit Diagram

Fig. 59: Dodge Pickup D150 1990 - Component Locations - DR6: Flow Chart

Dodge Pickup D150 1990 - DR7: CODE 21 "OXYGEN SENSOR SIGNAL"

Fig. 60: Dodge Pickup D150 1990 - Component Locations - DR7: Circuit Diagram

Fig. 61: Dodge Pickup D150 1990 - Component Locations - DR7: Flow Chart

Dodge Pickup D150 1990 - DR8: CODE 21 "OXYGEN SENSOR SHORTED HI"

Fig. 62: Dodge Pickup D150 1990 - Component Locations - DR8: Circuit Diagram

Fig. 63: Dodge Pickup D150 1990 - Component Locations - DR8: Flow Chart

Dodge Pickup D150 1990 - DR9: CODE 22 "COOLANT VOLTAGE LOW"

Fig. 64: Dodge Pickup D150 1990 - Component Locations - DR9: Circuit Diagram

Fig. 65: Dodge Pickup D150 1990 - Component Locations - DR9: Flow Chart

Dodge Pickup D150 1990 - DR10: CODE 22 "COOLANT VOLTAGE HIGH"

Fig. 66: Dodge Pickup D150 1990 - Component Locations - DR10: Circuit Diagram

Fig. 67: Dodge Pickup D150 1990 - Component Locations - DR10: Flow Chart

Dodge Pickup D150 1990 - DR11: CODE 23 "T/B TEMP VOLTAGE"

Fig. 68: Dodge Pickup D150 1990 - Component Locations - DR11: Circuit Diagram

Fig. 69: Dodge Pickup D150 1990 - Component Locations - DR11: Circuit Diagram & Flow Chart

Dodge Pickup D150 1990 - DR12: CODE 23 "T/B TEMP VOLTAGE HI"

Fig. 70: Dodge Pickup D150 1990 - Component Locations - DR12: Circuit Diagram

Fig. 71: Dodge Pickup D150 1990 - Component Locations - DR12: Flow Chart

Dodge Pickup D150 1990 - DR13: CODE 24 "TPS VOLTAGE"

Fig. 72: Dodge Pickup D150 1990 - Component Locations - DR13: Circuit Diagram

Fig. 73: Dodge Pickup D150 1990 - Component Locations - DR13: Flow Chart

Dodge Pickup D150 1990 - DR14: CODE 24 "TPS VOLTAGE HIGH"

Fig. 74: Dodge Pickup D150 1990 - Component Locations - DR14: Circuit Diagram

Fig. 75: Dodge Pickup D150 1990 - Component Locations - DR14: Flow Chart

Dodge Pickup D150 1990 - DR15: CODE 25 "AIS MOTOR CIRCUITS"

Fig. 76: Dodge Pickup D150 1990 - Component Locations - DR15: Circuit Diagram

Fig. 77: Dodge Pickup D150 1990 - Component Locations - DR15: Flow Chart

Dodge Pickup D150 1990 - DR16: CODE 27 "INJ 1 CONTROL CKT"

Fig. 78: Dodge Pickup D150 1990 - Component Locations - DR16: Circuit Diagram

Fig. 79: Dodge Pickup D150 1990 - Component Locations - DR16: Flow Chart (1 Of 2)

Fig. 80: Dodge Pickup D150 1990 - Component Locations - DR16: Flow Chart (2 Of 2)

Dodge Pickup D150 1990 - DR17: CODE 31 "PURGE SOLENOID CKT"

Fig. 81: Dodge Pickup D150 1990 - Component Locations - DR17: Circuit Diagram

Fig. 82: Dodge Pickup D150 1990 - Component Locations - DR17: Flow Chart

Dodge Pickup D150 1990 - DR18: CODE 32 "EGR SOLENOID CIRCUIT"

Fig. 83: Dodge Pickup D150 1990 - Component Locations - DR18: Circuit Diagram

Fig. 84: Dodge Pickup D150 1990 - Component Locations - DR18: Flow Chart

Dodge Pickup D150 1990 - DR19: CODE 32 "EGR SOLENOID CIRCUIT"

Fig. 85: Dodge Pickup D150 1990 - Component Locations - DR19: Circuit Diagram

Fig. 86: Dodge Pickup D150 1990 - Component Locations - DR19: Flow Chart (1 of 2)

Fig. 87: Dodge Pickup D150 1990 - Component Locations - DR19: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR20: CODE 33 "A/C CLUTCH RELAY CIRCUIT"

Fig. 88: Dodge Pickup D150 1990 - Component Locations - DR20: Circuit Diagram

Fig. 89: Dodge Pickup D150 1990 - Component Locations - DR20: Flow Chart

Dodge Pickup D150 1990 - DR21: CODE 35 "IDLE SWITCH SHORTED"

Fig. 90: Dodge Pickup D150 1990 - Component Locations - DR21: Circuit Diagram

Fig. 91: Dodge Pickup D150 1990 - Component Locations - DR21: Flow Chart

Dodge Pickup D150 1990 - DR22: CODE 35 "IDLE SWITCH SHORTED"

Fig. 92: Dodge Pickup D150 1990 - Component Locations - DR22: Circuit Diagram

Fig. 93: Dodge Pickup D150 1990 - Component Locations - DR22: Flow Chart

Dodge Pickup D150 1990 - DR23: CODE 36 "AIR SWITCH SOLENOID CIRCUIT"

Fig. 94: Dodge Pickup D150 1990 - Component Locations - DR23: Circuit Diagram

Fig. 95: Dodge Pickup D150 1990 - Component Locations - DR23: Flow Chart

Dodge Pickup D150 1990 - DR24: CODE 37 "PTU SOLENOID CIRCUIT" (W/O OVERDRIVE)

Fig. 96: Dodge Pickup D150 1990 - Component Locations - DR24: Circuit Diagram

Fig. 97: Dodge Pickup D150 1990 - Component Locations - DR24: Flow Chart (1 of 2)

Fig. 98: Dodge Pickup D150 1990 - Component Locations - DR24: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR25: CODE 37 "PTU SOLENOID CIRCUIT" (W/ OVERDRIVE)

Fig. 99: Dodge Pickup D150 1990 - Component Locations - DR25: Circuit Diagram

Fig. 100: Dodge Pickup D150 1990 - Component Locations - DR25: Flow Chart

Dodge Pickup D150 1990 - DR26: CODE 45 "OVERDRIVE SOLENOID"

Fig. 101: Dodge Pickup D150 1990 - Component Locations - DR26: Circuit Diagram

Fig. 102: Dodge Pickup D150 1990 - Component Locations - DR26: Flow Chart

Dodge Pickup D150 1990 - DR27: CODE 42 "Z1 VOLTAGE SENSE"

Fig. 103: Dodge Pickup D150 1990 - Component Locations - DR27: Circuit Diagram

Fig. 104: Dodge Pickup D150 1990 - Component Locations - DR27: Flow Chart

Dodge Pickup D150 1990 - DR28: CODES 62 & 63 CODE 62 "EMR MILES NOT STORED"/CODE 63 "EEPROM WRITE DENIED"

Fig. 105: Dodge Pickup D150 1990 - Component Locations - DR28: Flow Chart

Dodge Pickup D150 1990 - DR29: CHECK ENGINE CONTROLLER GROUND & POWER CKTS

Fig. 106: Dodge Pickup D150 1990 - Component Locations - DR29: Circuit Diagram

Fig. 107: Dodge Pickup D150 1990 - Component Locations - DR29: Flow Chart

Dodge Pickup D150 1990 - DR30: CHECK PARK/NEUTRAL SWITCH INPUT

Fig. 108: Dodge Pickup D150 1990 - Component Locations - DR30: Circuit Diagram

Fig. 109: Dodge Pickup D150 1990 - Component Locations - DR30: Flow Chart (1 of 2)

Fig. 110: Dodge Pickup D150 1990 - Component Locations - DR30: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR31: CHECKING COOLANT & TPS SENSOR CALIBRATIONS

Fig. 111: Dodge Pickup D150 1990 - Component Locations - DR27: Flow Chart

Dodge Pickup D150 1990 - DR32: CHECKING MAP/THROTTLE BODY SENSOR CALIBRATIONS

Fig. 112: Dodge Pickup D150 1990 - Component Locations - DR32: Flow Chart

Dodge Pickup D150 1990 - DR33: CHECKING CLOSED THROTTLE SWITCH

Fig. 113: Dodge Pickup D150 1990 - Component Locations - DR33: Circuit Diagram

Fig. 114: Dodge Pickup D150 1990 - Component Locations - DR33: Flow Chart

Dodge Pickup D150 1990 - DR34: CHECKING IDLE SPEED ACTUATOR OPERATION

Fig. 115: Dodge Pickup D150 1990 - Component Locations - DR34: Circuit Diagram

Fig. 116: Dodge Pickup D150 1990 - Component Locations - DR34: Flow Chart

Dodge Pickup D150 1990 - DR35: CHECKING SOLENOIDS

Fig. 117: Dodge Pickup D150 1990 - Component Locations - DR35: Flow Chart

Dodge Pickup D150 1990 - DR36: CHECKING EGR VALVE OPERATION

Fig. 118: Dodge Pickup D150 1990 - Component Locations - DR36: Flow Chart (1 of 2 )

Fig. 119: Dodge Pickup D150 1990 - Component Locations - DR36: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR37: CHECKING AIR SWITCHING SYSTEM

Fig. 120: Dodge Pickup D150 1990 - Component Locations - DR37: Flow Chart

Dodge Pickup D150 1990 - DR38: CHECKING SECONDARY IGNITION & TIMING

Fig. 121: Dodge Pickup D150 1990 - Component Locations - DR38: Flow Chart (1 of 2)

Fig. 122: Dodge Pickup D150 1990 - Component Locations - DR38: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR39: CHECKING FUEL PRESSURE

Fig. 123: Dodge Pickup D150 1990 - Component Locations - DR39: Flow Chart (1 of 2)

Fig. 124: Dodge Pickup D150 1990 - Component Locations - DR39: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR40: CHECKING HEATED AIR DOOR & FUEL IN CRANKCASE

Fig. 125: Dodge Pickup D150 1990 - Component Locations - DR40: Flow Chart

Dodge Pickup D150 1990 - DR41: CHECKING O2 SENSOR & HEATER FUNCTION

Fig. 126: Dodge Pickup D150 1990 - Component Locations - DR41: Circuit Diagram

Fig. 127: Dodge Pickup D150 1990 - Component Locations - DR41: Flow Chart (1 of 2)

Fig. 128: Dodge Pickup D150 1990 - Component Locations - DR41: Flow Chart (2 of 2)

Dodge Pickup D150 1990 - DR42: CHECKING MINIMUM & MAXIMUM AIRFLOW

Fig. 129: Dodge Pickup D150 1990 - Component Locations - DR42: Flow Chart

Dodge Pickup D150 1990 - DR43: OTHER POSSIBLE CAUSES OF DRIVEABILITY PROBLEMS

Fig. 130: Dodge Pickup D150 1990 - Component Locations - DR43: Flow Chart

Dodge Pickup D150 1990 - DR44: INTERMITTENT TEST FOR SOLENOIDS & RELAYS

Fig. 131: Dodge Pickup D150 1990 - Component Locations - DR44: Flow Chart

Dodge Pickup D150 1990 - DR45: INTERMITTENT TEST - MAP SENSOR PNEUMATIC CHANGE

Fig. 132: Dodge Pickup D150 1990 - Component Locations - DR45: Flow Chart

Dodge Pickup D150 1990 - DR46: INTERMITTENT TEST FOR VOLTAGE SENSORS

Fig. 133: Dodge Pickup D150 1990 - Component Locations - DR46: Flow Chart

Dodge Pickup D150 1990 - DR47: INTERMITTENT TEST FOR IDLE MOTOR CIRCUITS

Fig. 134: Dodge Pickup D150 1990 - Component Locations - DR47: Flow Chart

Dodge Pickup D150 1990 - DR48: INTERMITTENT TEST FOR FUEL INJECTOR

Fig. 135: Dodge Pickup D150 1990 - Component Locations - DR48: Flow Chart

Dodge Pickup D150 1990 - VERIFICATION TESTS VER1: VERIFICATION PROCEDURE 1

Fig. 136: Dodge Pickup D150 1990 - Component Locations - VER1: Flow Chart Verification Procedure 1

Dodge Pickup D150 1990 - VER2: VERIFICATION PROCEDURE 2

Fig. 137: Dodge Pickup D150 1990 - Component Locations - VER2: Flow Chart Verification Procedure 2 (1 of 2)

Fig. 138: Dodge Pickup D150 1990 - Component Locations - VER2: Flow Chart Verification Procedure 2 (2 of 2)

Dodge Pickup D150 1990 - VER3: VERIFICATION PROCEDURE 3

Fig. 139: Dodge Pickup D150 1990 - Component Locations - VER3: Flow Chart Verification Procedure 3 (1 of 2)

Fig. 140: Dodge Pickup D150 1990 - Component Locations - VER3: Flow Chart Verification Procedure 3 (2 of 2)

Dodge Pickup D150 1990 - SUMMARY

If no hard fault codes (or only pass codes) are present, proceed to TESTS W/O CODES article in this section for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.