Honda Prelude S 1994 - 1994 ENGINE PERFORMANCE Self-Diagnostics
Honda Prelude S 1994 - INTRODUCTION
If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).
Honda Prelude S 1994 - SELF-DIAGNOSTIC SYSTEM Hard Failures
Hard failures cause Malfunction Indicator Light (MIL) to illuminate and remain on until problem is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined by retrieving DTCs and using TROUBLE CODE CHARTS. See RETRIEVING CODES . If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, the vehicle runs but driveability will not be optimum.
Honda Prelude S 1994 - Intermittent Failures
Intermittent failures may cause Malfunction Indicator light (MIL) to flicker or illuminate and go out after the intermittent fault goes away. The corresponding DTC will be retained in ECM memory. If related fault does not reoccur within 50 starter operations, related DTC will be erased from control unit memory. Intermittent failures may be caused by sensor, connector or wiring related problems. See INTERMITTENTS in TESTS W/O CODES article.
Honda Prelude S 1994 - MALFUNCTION INDICATOR LIGHT (MIL)
All models are equipped with an MIL. As a bulb check, light illuminates when ignition is on and engine is not running. MIL also illuminates when a system failure has been detected and a corresponding DTC has been set in ECM memory. Not all trouble codes will activate MIL. If MIL is on and no DTCs are in memory, problem may be intermittent. See INTERMITTENTS in TESTS W/O CODES article.
Honda Prelude S 1994 - RETRIEVING CODES
Turn ignition off. Insert jumper wire in service check connector, located behind center console. See Fig. 1 .
Turn ignition on. Diagnostic Trouble Codes (DTCs) will be indicated by a series of long and short flashes on MIL. The number of long flashes indicates the number in the 10s column. The number of short flashes indicates the number in the 1s column. For example, 4 long flashes followed by 3 short flashes would indicate DTC 43.
See DIAGNOSTIC TROUBLE CODE IDENTIFICATION TABLE and proceed to appropriate TROUBLE CODE CHART for testing. All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated differently in testing procedure.
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Fig. 1: Honda Prelude S 1994 - Component Locations - Locating Service Check Connector
Honda Prelude S 1994 - DIAGNOSTIC TROUBLE CODE DEFINITION
Honda Prelude S 1994 DIAGNOSTIC TROUBLE CODE IDENTIFICATION
Code (1) | System Affected | Probable Cause |
0 | ECM | No Signal To ECM |
1 | Heated Oxygen Sensor (HO2S) | Problem In HO2S Circuit |
3 | MAP Sensor | Electrical Problem In MAP Sensor |
4 | Crank Angle Sensor (CKP) | Open Or Shorted Signal Circuit |
5 | MAP Sensor | Electrical problem in MAP Sensor |
6 | Engine Coolant Temperature (ECT) Sensor | Open Or Shorted Signal Circuit |
7 | Throttle Position (TP) Sensor | Open Or Shorted Signal Circuit |
8 | Crank Angle Sensor (TDC) | Open Or Shorted Signal Circuit |
9 | Crank Angle Sensor (CYP) | Open Or Shorted Signal Circuit |
10 | Intake Air Temperature(IAT) | Problem With Sensor |
12 | EGR System | No EGR Action |
13 | Barometric Pressure (BARO) Sensor | Problem With PA Circuit |
14 | Idle Air Control(IAC) Valve | Open Or Shorted Signal Circuit |
15 | Ignition Output Signal | Electrical Problem In Signal Circuit |
16 | Fuel Injector | Problem In Fuel Injector Circuit |
17 | Vehicle Speed Sensor (VSS) | Open Or Shorted Signal Circuit |
20 (2) | Electrical Load Detector (ELD) | Problem With ELD Circuit |
21 | Spool Solenoid Valve | Problem With VTEC Spool Solenoid Circuit |
2222 | VTEC Oil Pressure Switch | Problem In VTEC Oil Pressure Switch Circuit |
23 | Knock Sensor (KS) | Knock Sensor Circuit Fault |
30 | A/T FI Signal A | Problem In A/T Control Unit And ECM Circuit |
31 | A/T FI Signal B | Problem In A/T Control Unit And ECM Circuit |
41 | Heated Oxygen Sensor (HO2S) Heater | Problem With HO2S Circuit |
43 | Fuel Supply System | Problem With HO2S Circuit Or Fuel System |
If codes other than these are indicated, repeat self-diagnosis. If code(s) reappear, substitute a known good ECM, and recheck codes. If code(s) clear, replace ECM. MIL does not come on when there is a malfunction in ELD circuit, but code is stored in ECM memory. |
Honda Prelude S 1994 - ECM RESET PROCEDURE/CLEARING CODES
NOTE: | Some models have an anti-theft code built into the radio circuit. Clearing codes cancels clock and radio settings; make note of settings before beginning reset procedure. After ECM reset, the radio will not function until code is entered. |
To reset ECM (clear codes), remove CLOCK/RADIO fuse from underhood fuse/relay block. Leave fuse out for 10 seconds to reset ECM.
Honda Prelude S 1994 - ECM LOCATION
On Prelude, ECM is located under carpet in passenger-side footwell.
Honda Prelude S 1994 - TEST EQUIPMENT
All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated differently in testing procedure.
On Accord and Prelude, when directed by testing to install Engine Control Module (ECM) test harness, turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A) between ECM and ECM connector. See Fig. 2 . Follow testing directions. For test harness terminal identification, see Fig. 5 . For oil pressure gauge hookup, see Fig. 4 .
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Fig. 2: Honda Prelude S 1994 - Component Locations - Installing ECM Test Harness (Accord & Prelude)
On Odyssey, use Backprobe Set (07SAZ-001000A) to backprobe Engine Control Module (ECM) when directed by testing. See Fig. 3 . For ECM connector terminal identification, see Fig. 5 .
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Fig. 3: Honda Prelude S 1994 - Component Locations - Using Backprobe Set (Odyssey)
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Fig. 4: Honda Prelude S 1994 - Component Locations - Connecting Pressure Gauge Adaptor (Accord VTEC Engine)
Honda Prelude S 1994 - DIAGNOSTIC TROUBLE CODE CHARTS
NOTE: | In the following diagnostic trouble code charts, illustrations and schematics are courtesy of American Honda Motor Co., Inc. |
Honda Prelude S 1994 - Using Diagnostic Trouble Code Charts
To use DIAGNOSTIC TROUBLE CODE CHARTS, see RETRIEVING CODES under SELF-DIAGNOSTIC SYSTEM. After codes have been recorded, proceed to appropriate DIAGNOSTIC TROUBLE CODE CHART.
When directed by chart to install ECM test harness, turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and connector. See Fig. 5 . Follow code chart directions.
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Fig. 5: Honda Prelude S 1994 - Component Locations - Installing PGM-FI ECM Test Harness & Identifying Terminals
NOTE: | The Following Flow Charts are Courtesy of American Honda Motors Co., Inc. |
Honda Prelude S 1994 - CODE/NO CODE - NO START TROUBLE SHOOTING
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Fig. 6: Honda Prelude S 1994 - Component Locations - Flow Chart (1 Of 5) Code/No Code - No Start Trouble Shooting
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Fig. 7: Honda Prelude S 1994 - Component Locations - Flow Chart (2 Of 5) Code/No Code - No Start Trouble Shooting
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Fig. 8: Honda Prelude S 1994 - Component Locations - Flow Chart (3 Of 5) Code/No Code - No Start Trouble Shooting
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Fig. 9: Honda Prelude S 1994 - Component Locations - Flow Chart (4 Of 5) Code/No Code - No Start Trouble Shooting
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Fig. 10: Honda Prelude S 1994 - Component Locations - Flow Chart (5 Of 5) Code/No Code - No Start Trouble Shooting
Honda Prelude S 1994 - CODE 1 - HEATED OXYGEN SENSOR (HO2S)
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Fig. 11: Honda Prelude S 1994 - Component Locations - Code 1 Flow Chart Heated Oxygen Sensor (HO2S)
Honda Prelude S 1994 - CODE 3 - MAP SENSOR CIRCUIT
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Fig. 12: Honda Prelude S 1994 - Component Locations - Code 3 Flow Chart (1 Of 3) MAP Sensor Circuit
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Fig. 13: Honda Prelude S 1994 - Component Locations - Code 3 Flow Chart (2 Of 3) MAP Sensor Circuit
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Fig. 14: Honda Prelude S 1994 - Component Locations - Code 3 Flow Chart (3 Of 3) MAP Sensor Circuit
Honda Prelude S 1994 - CODE 4, 8 AND/OR 9 - TDC/CKP/CYP SENSOR
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Fig. 15: Honda Prelude S 1994 - Component Locations - Code 4, 8 AND/OR 9 Flow Chart (1 Of 2) TDC/CKP/CYP Sensor
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Fig. 16: Honda Prelude S 1994 - Component Locations - Code 4, 8 AND/OR 9 Flow Chart (2 Of 2) TDC/CKP/CYP Sensor
Honda Prelude S 1994 - CODE 5 - MAP SENSOR CIRCUIT
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Fig. 17: Honda Prelude S 1994 - Component Locations - Code 5 Flow Chart (1 Of 2) MAP Sensor Circuit
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Fig. 18: Honda Prelude S 1994 - Component Locations - Code 5 Flow Chart (2 Of 2) MAP Sensor Circuit
Honda Prelude S 1994 - CODE 6 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR
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Fig. 19: Honda Prelude S 1994 - Component Locations - Code 6 Flow Chart (1 Of 2) Engine Coolant Temperature (ECT) Sensor
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Fig. 20: Honda Prelude S 1994 - Component Locations - Code 6 Flow Chart (2 Of 2) Engine Coolant Temperature (ECT) Sensor
Honda Prelude S 1994 - CODE 7 - THROTTLE POSITION (TP) SENSOR
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Fig. 21: Honda Prelude S 1994 - Component Locations - Code 7 Flow Chart (1 Of 2) Throttle Position (TP) Sensor
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Fig. 22: Honda Prelude S 1994 - Component Locations - Code 7 Flow Chart (2 Of 2) Throttle Position (TP) Sensor
Honda Prelude S 1994 - CODE 10 - INTAKE AIR TEMPERATURE (IAT) SENSOR
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Fig. 23: Honda Prelude S 1994 - Component Locations - Code 10 Flow Chart (1 Of 2) Intake Air Temperature (IAT) Sensor
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Fig. 24: Honda Prelude S 1994 - Component Locations - Code 10 Flow Chart (2 Of 2) Intake Air Temperature (IAT) Sensor
Honda Prelude S 1994 - CODE 12 - EGR SYSTEM
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Fig. 25: Honda Prelude S 1994 - Component Locations - Code 12 Flow Chart (1 Of 5) EGR System
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Fig. 26: Honda Prelude S 1994 - Component Locations - Code 12 Flow Chart (2 Of 5) EGR System
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Fig. 27: Honda Prelude S 1994 - Component Locations - Code 12 Flow Chart (3 Of 5) EGR System
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Fig. 28: Honda Prelude S 1994 - Component Locations - Code 12 Flow Chart (4 Of 5) EGR System
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Fig. 29: Honda Prelude S 1994 - Component Locations - Code 12 Flow Chart (5 Of 5) EGR System
Honda Prelude S 1994 - CODE 13 - BAROMETRIC PRESSURE (BARO) SENSOR
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Fig. 30: Honda Prelude S 1994 - Component Locations - Code 13 Flow Chart Barometric Pressure (BARO) Sensor
Honda Prelude S 1994 - CODE 14 - IDLE AIR CONTROL (IAC) VALVE
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Fig. 31: Honda Prelude S 1994 - Component Locations - Code 14 Flow Chart (1 Of 2) Idle Air Control (IAC) Valve
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Fig. 32: Honda Prelude S 1994 - Component Locations - Code 14 Flow Chart (2 Of 2) Idle Air Control (IAC) Valve
Honda Prelude S 1994 - CODE 15 - IGNITION OUTPUT SIGNAL
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Fig. 33: Honda Prelude S 1994 - Component Locations - Code 15 Flow Chart (1 Of 2) Ignition Output Signal
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Fig. 34: Honda Prelude S 1994 - Component Locations - Code 15 Flow Chart (2 Of 2) Ignition Output Signal
Honda Prelude S 1994 - CODE 16 - FUEL INJECTORS
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Fig. 35: Honda Prelude S 1994 - Component Locations - Code 16 Flow Chart (1 Of 3) Fuel Injectors
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Fig. 36: Honda Prelude S 1994 - Component Locations - Code 16 Flow Chart (2 Of 3) Fuel Injectors
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Fig. 37: Honda Prelude S 1994 - Component Locations - Code 16 Flow Chart (3 Of 3) Fuel Injectors
Honda Prelude S 1994 - CODE 17 - VEHICLE SPEED SENSOR (VSS)
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Fig. 38: Honda Prelude S 1994 - Component Locations - Code 17 Flow Chart (1 Of 2) Vehicle Speed Sensor (VSS)
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Fig. 39: Honda Prelude S 1994 - Component Locations - Code 17 Flow Chart (2 Of 2) Vehicle Speed Sensor (VSS)
Honda Prelude S 1994 - CODE 20 - ELECTRICAL LOAD DETECTOR (ELD)
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Fig. 40: Honda Prelude S 1994 - Component Locations - Code 20 Flow Chart (1 Of 2) Electrical Load Detector (ELD)
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Fig. 41: Honda Prelude S 1994 - Component Locations - Code 20 Flow Chart (2 Of 2) Electrical Load Detector (ELD)
Honda Prelude S 1994 - CODE 21 - VTEC SOLENOID VALVE CIRCUIT
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Fig. 42: Honda Prelude S 1994 - Component Locations - Code 21 Flow Chart VTEC Solenoid Valve Circuit (1 Of 2)
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Fig. 43: Honda Prelude S 1994 - Component Locations - Code 21 Flow Chart VTEC Solenoid Valve Circuit (2Of 2)
Honda Prelude S 1994 - CODE 22 - VTEC PRESSURE SWITCH CIRCUIT
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Fig. 44: Honda Prelude S 1994 - Component Locations - Code 22 Flow Chart VTEC Presure Switch Circuit (1 Of 3)
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Fig. 45: Honda Prelude S 1994 - Component Locations - Code 22 Flow Chart VTEC Pressure Switch Circuit (2 Of 3)
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Fig. 46: Honda Prelude S 1994 - Component Locations - Code 22 Flow Chart VTEC Pressure Switch Circuit (2 Of 3)
Honda Prelude S 1994 - CODE 23 - KNOCK SENSOR (KS)
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Fig. 47: Honda Prelude S 1994 - Component Locations - Code 23 Flow Chart (1 Of 2) Knock Sensor (KS)
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Fig. 48: Honda Prelude S 1994 - Component Locations - Code 23 Flow Chart (2 Of 2) Knock Sensor (KS)
Honda Prelude S 1994 - CODE 30 OR 31 - A/T FI SIGNAL "A" (30) OR "B" (31)
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Fig. 49: Honda Prelude S 1994 - Component Locations - Code 30 OR 31 Flow Chart A/T FI Signal "A" (30) OR "B" (31)
Honda Prelude S 1994 - CODE 41 - HEATED OXYGEN SENSOR (HO2S) HEATER
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Fig. 50: Honda Prelude S 1994 - Component Locations - Code 41 Flow Chart (1 Of 3) Heated Oxygen Sensor (HO2S) Heater
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Fig. 51: Honda Prelude S 1994 - Component Locations - Code 41 Flow Chart (2 Of 3) Heated Oxygen Sensor (HO2S) Heater
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Fig. 52: Honda Prelude S 1994 - Component Locations - Code 41 Flow Chart (3 Of 3) Heated Oxygen Sensor (HO2S) Heater
Honda Prelude S 1994 - CODE 43 - FUEL SUPPLY SYSTEM
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Fig. 53: Honda Prelude S 1994 - Component Locations - Code 43 Flow Chart (1 Of 2) Fuel Supply System
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Fig. 54: Honda Prelude S 1994 - Component Locations - Code 43 Flow Chart (1 Of 2) Fuel Supply System
Honda Prelude S 1994 - SUMMARY
If no hard trouble codes (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedure.