Honda Civic LX 1992 - 1992 ENGINE PERFORMANCE Self-Diagnostics

Honda Civic LX 1992 - INTRODUCTION

For automatic transmission testing and diagnosis, see M24A ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

If no faults were found while performing BASIC TESTING article in this section, proceed with self-diagnostics. If no trouble codes or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article in this section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

Honda Civic LX 1992 - SELF-DIAGNOSTIC SYSTEM HARD FAILURES

Hard failures cause CHECK ENGINE light 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 using TROUBLE CODE CHARTS . 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 Civic LX 1992 - INTERMITTENT FAILURES

Intermittent failures may cause CHECK ENGINE light to flicker or illuminate and go out after the intermittent fault goes away. However, the corresponding trouble code will be retained in ECU memory. If related fault does not reoccur within 50 starter operations, related trouble code 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 in this section.

Honda Civic LX 1992 - CHECK ENGINE LIGHT

All models are equipped with a CHECK ENGINE light. As a bulb check, light illuminates when ignition is on and engine is not running. CHECK ENGINE light also illuminates when a system failure has been detected and a corresponding trouble code has been set in ECU memory. Not all trouble codes will activate CHECK ENGINE light. If the CHECK ENGINE light is on and no codes are in memory, refer to the TESTS W/O CODES article in this section.

Honda Civic LX 1992 - RETRIEVING CODES

With ignition off, insert jumper wire in service check connector terminal, located behind right side of dash. See Fig. 1 . Turn ignition on and count flashes on CHECK ENGINE light.

SeeTROUBLE 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 procedures.

Fig. 1: Honda Civic LX 1992 - Component Locations - Locating Service Check Connectors (Civic)

Honda Civic LX 1992 - TROUBLE CODE DEFINITION

Honda Civic LX 1992 TROUBLE CODE IDENTIFICATION CHART

Code (1)	System Affected	Probable Cause
0	ECU	No Signal To ECU
1	O2 Sensor (D15B8)	Problem In O2 Sensor Circuit
1	O2 Sensor (D15B7 & D16Z6)	Problem In O2 Sensor Circuit
3	MAP Sensor	Electrical Problem In MAP Sensor
4	Crank Angle Sensor (CRANK)	Open Or Shorted Signal Circuit
5	MAP Sensor (D15B7)	Mechanical Problem In MAP Sensor
5	MAP Sensor (D15B8, D15Z1 & D16Z6)	Mechanical Problem In MAP Sensor
6	Coolant Temp. (TW) Sensor	Open Or Shorted Signal Circuit
7	Throttle Angle Sensor	Open Or Shorted Signal Circuit
8	Crank Angle Sensor (TDC)	Open Or Shorted Signal Circuit
9	Crank Angle Sensor (CYL)	Open Or Shorted Signal Circuit
10	Intake Air Temperature	Problem With Sensor
12	EGR System	No EGR action
13	Atmospheric Pressure (PA)	Problem with PA Circuit
14	Electronic Air Control Valve (EACV)	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
19	A/T Lock-up Control Solenoid	Problem In Lock-Up Solenoid Circuit
20	Electrical Load Detector	Problem With Electrical Load Detector Circuit
21	Spool Solenoid Valve	Problem With VTEC Spool Solenoid Circuit
22	VTEC Oil Pressure Switch	Problem In VTEC Oil Pressure Switch Circuit
41	LAF Sensor Heater (D15Z1)	Problem With LAF Sensor Circuit
41	O2 Sensor Heater (D15B7 & D16Z6)	Problem With O2 Sensor Circuit
43	Fuel Supply System (Except D15Z1)	Problem With O2 Sensor Circuit Or Fuel System
48	LAF Sensor (D15Z1 Engine)	Problem With LAF Sensor Circuit; Wire Harness Open Or Short Check
(1) If codes other than these are indicated, repeat self-diagnosis. If code(s) reappear, substitute a known good ECU, and recheck codes. If code(s) clear, replace ECU.

Honda Civic LX 1992 - ECU RESET PROCEDURE/CLEARING CODES

To reset ECU, remove BACK UP fuse (CLOCK/RADIO fuse on Prelude) from underhood fuse/relay block. Leave fuse out for 10 seconds to reset ECU. This procedure cancels clock and radio settings, make note of settings before beginning reset procedure.

NOTE:

Some models have an anti-theft code built into the radio circuit. After ECU reset, the radio will not function until code is entered.

Honda Civic LX 1992 - ECU LOCATION

The ECU is located in passenger side kick panel. See Fig. 1 .

Honda Civic LX 1992 - SUMMARY

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

Honda Civic LX 1992 - TROUBLE CODE CHARTS

NOTE:

In the following trouble code charts, illustrations and schematics are courtesy of American Honda Motor Co., Inc.

Honda Civic LX 1992 - USING TROUBLE CODE CHARTS

To use TROUBLE CODE CHARTS, see RETRIEVING CODES under SELF-DIAGNOSTIC SYSTEM. After codes have been recorded, proceed to appropriate TROUBLE CODE CHART.

When directed by chart to install ECU test harness, turn ignition off. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and connector. See Fig. 2 . Follow code chart directions.

If CHECK ENGINE light fails to light when ignition switch is turned on, proceed to NO CODE, NO CHECK ENGINE LIGHT chart for appropriate vehicle.

If check engine light stays on for more than 2 seconds after ignition switch is turned on, proceed to CODE/NO CODE, CHECK ENGINE LIGHT STAYS ON chart for appropriate vehicle.

Fig. 2: Honda Civic LX 1992 - Component Locations - Installing PGM-FI ECU Test Harness & Terminal ID

Honda Civic LX 1992 - CODE/NO CODE - NO-START TROUBLE SHOOTING

Fig. 3: Honda Civic LX 1992 - Component Locations - Code/No Code Chart - No-Start Trouble Shooting

Honda Civic LX 1992 - NO CODE - NO CHECK ENGINE LIGHT

Fig. 4: Honda Civic LX 1992 - Component Locations - No Code Chart - No CHECK ENGINE Light

Honda Civic LX 1992 - CODE/NO CODE - CHECK ENGINE LIGHT STAYS ON

Fig. 5: Honda Civic LX 1992 - Component Locations - Code/No Code Chart (1 Of 3) - CHECK ENGINE Light Stays On

Fig. 6: Honda Civic LX 1992 - Component Locations - Code/No Code Chart (2 Of 3) - CHECK ENGINE Light Stays On

Fig. 7: Honda Civic LX 1992 - Component Locations - Code/No Code Chart (3 Of 3) - CHECK ENGINE Light Stays On

Honda Civic LX 1992 - CODE 1 - OXYGEN SENSOR CIRCUIT (D15B8)

Fig. 8: Honda Civic LX 1992 - Component Locations - Code 1 Chart (1 Of 2) - Oxygen Sensor CKT. (D15B8)

Fig. 9: Honda Civic LX 1992 - Component Locations - Code 1 Chart (2 Of 2) - Oxygen Sensor CKT. (D15B8)

Honda Civic LX 1992 - CODE 1 - OXYGEN SENSOR CIRCUIT (D15B7 & D16Z6)

Fig. 10: Honda Civic LX 1992 - Component Locations - Code 1 Chart - Oxygen Sensor CKT. (D15B7 & D16Z6)

Honda Civic LX 1992 - CODE 3 - MAP SENSOR CIRCUIT

Fig. 11: Honda Civic LX 1992 - Component Locations - Code 3 Chart (1 Of 2) - MAP Sensor CKT.

Fig. 12: Honda Civic LX 1992 - Component Locations - Code 3 Chart (2 Of 2) - MAP Sensor CKT.

Honda Civic LX 1992 - CODES 4, 8 & 9 - TDC/CRANK/CYL SENSOR CIRCUITS

Fig. 13: Honda Civic LX 1992 - Component Locations - Codes 4, 8 & 9 Chart (1 Of 2) TDC/CRANK/CYL Sensor CKT.

Fig. 14: Honda Civic LX 1992 - Component Locations - Codes 4, 8 & 9 Chart (1 Of 2) TDC/CRANK/CYL Sensor CKT.

Honda Civic LX 1992 - CODE 5 - MAP SENSOR (MECHANICAL) (D15B7)

Fig. 15: Honda Civic LX 1992 - Component Locations - Code 5 Chart (1 OF 2) - MAP Sensor (Mechanical) D15B7

Fig. 16: Honda Civic LX 1992 - Component Locations - Code 5 Chart (2 OF 2) - MAP Sensor (Mechanical) D15B7

Honda Civic LX 1992 - CODE 5 - MAP SENSOR (MECHANICAL) D15B8, D15Z1 & D16Z6

Fig. 17: Honda Civic LX 1992 - Component Locations - Code 5 Chart (1 Of 2) MAP Sensor Mech. D15B8,D15Z1,D16Z6

Fig. 18: Honda Civic LX 1992 - Component Locations - Code 5 Chart (2 Of 2) MAP Sensor Mech. D15B8,D15Z1,D16Z6

Honda Civic LX 1992 - CODE 6 - COOLANT TEMPERATURE (TW) SENSOR CIRCUIT

Fig. 19: Honda Civic LX 1992 - Component Locations - Code 6 Chart (1 Of 2) - Coolant Temp. (TW) Sensor CKT.

Fig. 20: Honda Civic LX 1992 - Component Locations - Code 6 Chart (2 Of 2) - Coolant Temp. (TW) Sensor CKT.

Honda Civic LX 1992 - CODE 7 - THROTTLE ANGLE SENSOR CKT.

Fig. 21: Honda Civic LX 1992 - Component Locations - Code 7 Chart (1 OF 2) - Throttle Angle Sensor CKT.

Fig. 22: Honda Civic LX 1992 - Component Locations - Code 7 Chart (1 OF 2) - Throttle Angle Sensor CKT.

Honda Civic LX 1992 - CODE 10 - AIR TEMPERATURE (TA) SENSOR CIRCUIT

Fig. 23: Honda Civic LX 1992 - Component Locations - Code 10 Chart (2 Of 2) - Air Temperature (TA) Sensor CKT.

Fig. 24: Honda Civic LX 1992 - Component Locations - Code 10 Chart (2 Of 2) - Air Temperature (TA) Sensor CKT.

Honda Civic LX 1992 - CODE 12 - EXHAUST GAS RECIRCULATION (EGR) SYSTEM

Fig. 25: Honda Civic LX 1992 - Component Locations - Code 12 Chart (1 OF 4) - EGR System

Fig. 26: Honda Civic LX 1992 - Component Locations - Code 12 Chart (2 OF 4) - EGR System

Fig. 27: Honda Civic LX 1992 - Component Locations - Code 12 Chart (3 OF 4) - EGR System

Fig. 28: Honda Civic LX 1992 - Component Locations - Code 12 Chart (4 OF 4) - EGR System

Honda Civic LX 1992 - CODE 13 - ATMOSPHERIC PRESSURE (PA) SENSOR

Fig. 29: Honda Civic LX 1992 - Component Locations - Code 13 Chart - Atmospheric Pressure (PA) Sensor

Honda Civic LX 1992 - CODE 14 - ELECTRIC AIR CONTROL VALVE (EACV) SYSTEM

Fig. 30: Honda Civic LX 1992 - Component Locations - CODE 14 - Electric Air Control Valve (EACV) System

Honda Civic LX 1992 - CODE 15 - IGNITION OUTPUT SIGNAL

Fig. 31: Honda Civic LX 1992 - Component Locations - Code 15 Chart (1 Of 2) - Ignition Output Signal

Fig. 32: Honda Civic LX 1992 - Component Locations - Code 15 Chart (2 Of 2) - Ignition Output Signal

Honda Civic LX 1992 - CODE 16 - INJECTOR CIRCUIT

Fig. 33: Honda Civic LX 1992 - Component Locations - Code 16 Chart (1 Of 2) - Injector Circuit

Fig. 34: Honda Civic LX 1992 - Component Locations - Code 16 Chart (2 Of 2) - Injector Circuit

Honda Civic LX 1992 - CODE 17 - VEHICLE SPEED SENSOR (VSS) CIRCUIT

Fig. 35: Honda Civic LX 1992 - Component Locations - Code 17 Chart (1 Of 2) - Vehicle Speed Sensor (VSS) CKT.

Fig. 36: Honda Civic LX 1992 - Component Locations - Code 17 Chart (2 Of 2) - Vehicle Speed Sensor (VSS) CKT.

Honda Civic LX 1992 - CODE 19 - LOCK-UP CONTROL SOLENOID CIRCUITS

Fig. 37: Honda Civic LX 1992 - Component Locations - Code 19 Chart (1 Of 2) - Lock-Up Control Solenoid CKT.

Fig. 38: Honda Civic LX 1992 - Component Locations - Code 19 Chart (2 Of 2) - Lock-Up Control Solenoid CKT.

Honda Civic LX 1992 - CODE 20 - ELECTRICAL LOAD DETECTOR (ELD) CIRCUIT

Fig. 39: Honda Civic LX 1992 - Component Locations - Code 20 Chart (1 Of 2) - Elec. Load Detector (ELD) CKT.

Fig. 40: Honda Civic LX 1992 - Component Locations - Code 20 Chart (2 Of 2) - Elec. Load Detector (ELD) CKT.

Honda Civic LX 1992 - CODE 21 - VTEC SPOOL VALVE CIRCUIT

Fig. 41: Honda Civic LX 1992 - Component Locations - Code 21 Chart (1 Of 2) - VTEC Spool Valve CKT.

Fig. 42: Honda Civic LX 1992 - Component Locations - Code 21 Chart (2 Of 2) - VTEC Spool Valve CKT.

Honda Civic LX 1992 - CODE 22 - VTEC OIL PRESSURE SWITCH CIRCUIT

Fig. 43: Honda Civic LX 1992 - Component Locations - Code 22 Chart (1 Of 3) - VTEC Oil Pressure Switch CKT.

Fig. 44: Honda Civic LX 1992 - Component Locations - Code 22 Chart (2 Of 3) - VTEC Oil Pressure Switch CKT.

Fig. 45: Honda Civic LX 1992 - Component Locations - Code 22 Chart (3 Of 3) - VTEC Oil Pressure Switch CKT.

Honda Civic LX 1992 - CODE 41 - LAF SENSOR HEATER CIRCUIT (D15Z1)

Fig. 46: Honda Civic LX 1992 - Component Locations - Code 41 Chart (1 Of 2) - LAF Sensor Heater CKT. (D15Z1)

Fig. 47: Honda Civic LX 1992 - Component Locations - Code 41 Chart (2 Of 2) - LAF Sensor Heater CKT. (D15Z1)

Honda Civic LX 1992 - CODE 41 - OXYGEN SENSOR HEATER CIRCUIT (D15B7 & D16Z6)

Fig. 48: Honda Civic LX 1992 - Component Locations - Code 41 Chart (1 Of 3) O2 Sensor Heater CKT. D15B7,D16Z6

Fig. 49: Honda Civic LX 1992 - Component Locations - Code 41 Chart (2 Of 3) O2 Sensor Heater CKT. D15B7,D16Z6

Fig. 50: Honda Civic LX 1992 - Component Locations - Code 41 Chart (3 Of 3) O2 Sensor Heater CKT. D15B7,D16Z6

Honda Civic LX 1992 - CODE 43 - FUEL SUPPLY SYSTEM

Fig. 51: Honda Civic LX 1992 - Component Locations - Code 43 Chart (1 Of 2) - Fuel Supply System

Fig. 52: Honda Civic LX 1992 - Component Locations - Code 43 Chart (2 Of 2) - Fuel Supply System

Honda Civic LX 1992 - CODE 48 - LAF SENSOR CIRCUIT (D15Z1)

Fig. 53: Honda Civic LX 1992 - Component Locations - Code 48 Chart (1 Of 3) - LAF Sensor CKT. (D15Z1)

Fig. 54: Honda Civic LX 1992 - Component Locations - Code 48 Chart (2 Of 3) - LAF Sensor CKT. (D15Z1)

Fig. 55: Honda Civic LX 1992 - Component Locations - Code 48 Chart (3 Of 3) - LAF Sensor CKT. (D15Z1)

Honda Civic LX 1992 - CODE 48 - WIRE HARNESS OPEN OR SHORT CHECK (D15Z1)

Fig. 56: Honda Civic LX 1992 - Component Locations - Code 48 Chart - Wire Harness Open Or Short Check (D15Z1)