Category OBD 1

Honda accord obd 1 tutorial

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Honda accord obd 1 tutorial

Accessing trouble codes

Trouble codes are displayed by the malfunction indicator lamp (MIL). Ensure ignition switched OFF.
Bridge data link connector (DLC) terminals. RHD: Fig. 1 . LHD: Fig. 2 .
  1. Switch ignition ON.
  2. Count MIL flashes. 
  3. Note trouble codes. 
  4. Compare with trouble code table. 
  5. Trouble codes 1-9 are indicated as follows:
  6. Individual short flashes display trouble code Fig. 3 [A]. 
  7. A short pause separates each flash Fig. 3 [B].
  8. A long pause separates each trouble code Fig. 3 [C]. 
  9. For example: Trouble code 3 displayed Fig. 3 . 
  10. Trouble codes greater than 9 are indicated as follows:
  11. Long flashes indicate the ‘tens’ of the trouble code Fig. 4 [A]. 
  12. Short flashes indicate the ‘units’ of the trouble code Fig. 4 [C]. 
  13. A short pause separates each flash Fig. 4 [B].
  14. A long pause separates each trouble code Fig. 4 [D]. 
  15. For example: Trouble code 12 displayed Fig. 4 . 
  16. Switch ignition OFF. 
  17. Rectify faults as necessary.


Erasing trouble codes

  1. Switch ignition OFF.
  2. Disconnect bridge wire from data link connector.
  3. Remove fuse F32 (7,5A) from underbonnet fusebox for 10 seconds .
  4. Refit fuse.

WARNING: Removing 7,5A fuse may erase memory from electronic units (e.g. radio, clock).



HONDA ACCORD LIST OF OBD 1 CODES
Trouble code
Fault location
Probable cause
0
Engine control module (ECM)
ECM
1
Heated oxygen sensor (HO2S)/oxygen sensor (O2S)
Fuel pressure/pump, wiring short to earth/open circuit/short to positive, HO2S/O2S, ECM
3
Manifold absolute pressure (MAP) sensor circuit
Wiring, supply voltage, MAP sensor, ECM
4
Engine speed (RPM) sensor
Wiring, RPM sensor, ECM
5
Manifold absolute pressure (MAP) sensor circuit
Wiring, supply voltage, MAP sensor, ECM
6
Engine coolant temperature (ECT) sensor
Wiring short to earth/open circuit, ECT sensor, ECM
7
Throttle position (TP) sensor
Wiring short to earth/open circuit, TP sensor, ECM
8
Crankshaft position (CKP) sensor
CKP sensor, wiring short to earth/open circuit, ECM
9
Camshaft position (CMP) sensor
CMP sensor, wiring short to earth/open circuit, ECM
10
Intake air temperature (IAT) sensor
Wiring short to earth/open circuit, IAT sensor, ECM
11
Mixture adjustment resistor voltage low/high
Wiring short/open circuit, IAT sensor, ECM
12
Exhaust gas recirculation (EGR) system -malfunction
Wiring, EGR valve/EGR valve position sensor, ECM
14
Idle air control (IAC) valve circuit
Wiring, supply voltage, IAC valve, ECM
15
Ignition amplifier control circuit
Wiring, supply voltage, ignition amplifier, ECM
16
Injectors circuit malfunction
Wiring, supply voltage, injectors, ECM
17
Vehicle speed sensor (VSS)
Wiring, VSS, ECM
19
AT lock-up clutch not engaging/gear shift malfunction
Wiring, lock-up control solenoid A/B, ECM
20
Electrical load sensor malfunction
Wiring, electrical load sensor, ECM
21
VTEC system malfunction
Wiring, VTEC solenoid, VTEC pressure switch, ECM
22
VTEC system malfunction
Wiring, VTEC solenoid, VTEC pressure switch, ECM
41
Oxygen sensor heater circuit malfunction
Wiring short to earth/open circuit/short to positive, HO2S, ECM
43
Heated oxygen sensor (HO2S)/fuel supply system circuit malfunction
Wiring, fuel pressure/pump/filter, injector, HO2S, ECM
48
Heated oxygen sensor (HO2S) 1, bank 1 circuit malfunction
Wiring, HO2S, ECM

Honda Civic OBD 1 Codes Reading Tutorial

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Honda Civic OBD 1 Codes Reading Tutorial

Accessing the trouble code:

  • Ensure ignition switched OFF.
  • Bridge 2-pin data link connector (DLC) terminals Fig. 1 .

NOTE: DO NOT bridge 3 or 5-pin data link connector (DLC) terminals.
  • Switch ignition ON. 
  • Count MIL flashes. Note trouble codes. Compare with trouble code table.
NOTE: No trouble codes stored if MIL illuminates continuously.
  1. Trouble codes 1-9 are indicated as follows:
  2. Individual short flashes display trouble code Fig. 2 [A]. 
  3. A short pause separates each flash Fig. 2 [B].
  4. A long pause separates each trouble code Fig. 2 [C]. 
  5. For example: Trouble code 3 displayed Fig. 2 . 
  6. Trouble codes greater than 9 are indicated as follows:
  7. Long flashes indicate the ‘tens’ of the trouble code Fig. 3 [A]. 
  8. Short flashes indicate the ‘units’ of the trouble code Fig. 3 [C]. 
  9. A short pause separates each flash Fig. 3 [B].
  10. A long pause separates each trouble code Fig. 3 [D]. 
  11. For example: Trouble code 12 displayed Fig. 3 . 
  12. Switch ignition OFF.
  13. Rectify faults as necessary.

NOTE: If a trouble code is displayed but not listed in the trouble code table, suspect engine control module (ECM) fault.


ERASING THE TROUBLE CODE INSTRUCTION

Switch ignition OFF. Remove bridge wire.
Remove BACK UP (RADIO) fuse (7,5A) from underbonnet fusebox for 10 seconds minimum:
D14A2, D14A5, D14A7, D14A8, D15B2, D15B7, D15Z1, D15Z3, D15Z8, B16A2 1995, D16B2, D16Y2, D16Y3, D16Y7, D16Y8, D16Z6, D16Z7, D16Z9, B18C4 – Fig. 4 .
D14A3, D14A4, D15Z6, B16A2 1995 , D16Y5 – Fig. 5 . Refit fuse.
Trouble codes may also be erased by disconnecting battery lead.

LIST OF HONDA CIVIC OBD 1 CODES

Flash type
Fault location
Probable cause
1
Heated oxygen sensor (HO2S)/oxygen sensor (O2S)
Fuel pressure/pump, wiring short to earth/open circuit/short to positive, HO2S/O2S, ECM
3
Manifold absolute pressure (MAP) sensor circuit
Wiring, supply voltage, MAP sensor, ECM
4
Engine speed (RPM) sensor
Wiring, RPM sensor, ECM
5
Manifold absolute pressure (MAP) sensor signal
Intake leak, vacuum hose blocked, wiring, MAP sensor, ECM
6
Engine coolant temperature (ECT) sensor
Wiring short to earth/open circuit, ECT sensor, ECM
7
Throttle position (TP) sensor
Wiring short to earth/open circuit, TP sensor, ECM
8
Crankshaft position (CKP) sensor
CKP sensor, wiring short to earth/open circuit, ECM
9
Camshaft position (CMP) sensor
CMP sensor, wiring short to earth/open circuit, ECM
10
Intake air temperature (IAT) sensor
Wiring short to earth/open circuit, IAT sensor, ECM
12
Exhaust gas recirculation (EGR) system control
Wiring, vacuum hose(s), EGR solenoid, EGR valve position sensor, EGR valve, ECM
14
Idle air control (IAC) valve circuit
Wiring, supply voltage, IAC valve, ECM
15
Ignition amplifier control circuit
Wiring, supply voltage, ignition amplifier, ECM
16
Injectors
Wiring, supply voltage, injector, ECM
17
Vehicle speed sensor (VSS)
Wiring, VSS, ECM
19
Transmission lock-up solenoid
Wiring, solenoid, ECM
20
Electrical load sensor
Wiring, electrical load sensor, ECM
21
Camshaft position (CMP) actuator
Wiring, CMP actuator, ECM
22
Camshaft position (CMP) actuator oil pressure switch
Wiring, CMP actuator oil pressure switch, ECM
23
Knock sensor (KS)
Wiring, KS, ECM
41
Oxygen sensor heater circuit malfunction
Wiring short to earth/open circuit/short to positive, HO2S, ECM
43
Heated oxygen sensor (HO2S)/fuel supply system circuit malfunction
Wiring, fuel pressure/pump/filter, injector, HO2S, ECM
48
Heated oxygen sensor (HO2S) circuit malfunction
Wiring, HO2S, ECM
54
Engine speed fluctuation sensor
Wiring, engine speed fluctuation sensor, ECM
Thank You Very Much!