HOW TO DIAGNOSE HONDA OBD1 2 PIN SOCKET

Honda OBD1 2 Pin OBD Socket DIY Diagnostic without OBD Tools

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HOW TO DIAGNOSE HONDA OBD1 2 PIN SOCKET

General information

  • Engine control module (ECM) incorporates transmission control function.
  • Flash type trouble codes can be displayed by the malfunction indicator lamp (MIL) with data link connector (DLC) 1 bridged.
  • Without 16-pin DLC: EOBD trouble codes not displayed. Flash type trouble codes can also be displayed by using diagnostic equipment connected to the 3/5-pin DLC 2.
  • With 16-pin DLC: EOBD trouble codes displayed by using diagnostic equipment connected to the DLC 2.

Accessing

  • Ensure ignition switched OFF.
  • Bridge terminals of data link connector (DLC) 1 Fig. 1 .
  • Switch ignition ON.
  • Count MIL flashes.FIG 6 Note trouble codes. Compare with trouble code table.

HOW TO DIAGNOSE HONDA OBD1 2 PIN SOCKET

NOTE: No trouble codes stored if MIL illuminates continuously.

  • Trouble codes 1-9 are indicated as follows:
  • Individual short flashes display trouble code Fig. 2 [A].
  • A short pause separates each flash Fig. 2 [B].
  • A long pause separates each trouble code Fig. 2 [C].
  • For example: Trouble code 3 displayed Fig. 2 .
  • Trouble codes greater than 9 are indicated as follows:
  • Long flashes indicate the ‘tens’ of the trouble code Fig. 3 [A].
  • Short flashes indicate the ‘units’ of the trouble code Fig. 3 [C].
  • A short pause separates each flash Fig. 3 [B].
  • A long pause separates each trouble code Fig. 3 [D].
  • For example: Trouble code 12 displayed Fig. 3 .
  • Switch ignition OFF.
  • 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.

With 16-pin DLC: More detailed trouble code information available using diagnostic equipment connected to the DLC.

Erasing codes

  • Ensure ignition switched OFF.
  • Remove bridge wire.
  • Civic – D14Z1/2, D16W3/4: Remove No.14 BACK UP fuse (7,5A) from underbonnet fuse box/relay plate for 10 seconds minimum Fig. 4 .
  • Civic – D14Z3/4, D16Y7/8: Remove No.2 BACK UP fuse (7,5A) from underbonnet fuse box/relay plate for 10 seconds minimum Fig. 5 .
  • Accord 1,6: Remove No.6 ECM fuse (7,5A) from passenger’s side fascia fuse box for 10 seconds minimum Fig. 6 .
  • Accord (except 1,6)/Accord Coupe: Remove No.13 RADIO BACK UP fuse (7,5A) from passenger’s side fascia
  • fuse box for 10 seconds minimum Fig. 7 .
  • Refit fuse.
  • Trouble codes may also be erased by disconnecting battery lead.

WARNING: Disconnecting BACK UP fuse or battery may erase memory from electronic units (e.g. radio, clock).

  • Repeat checking procedure to ensure no data remains in ECM fault memory.
  • The engine control module (ECM) fault memory can also be erased using diagnostic equipment connected to the data link connector (DLC).

OBD1 CODE LIST

Flash type

Fault location

Probable cause

1Heated oxygen sensor (HO2S) 1, bank 1 – circuit malfunction/voltage low/highWiring open/short circuit, HO2S, fuel system, ECM
2Vehicle speed sensor (VSS), MT – circuit malfunction/range/performance problemWiring, speedometer, VSS, ECM
3Manifold absolute pressure (MAP) sensor – circuit malfunction/voltage low/highWiring, MAP sensor, ECM
4
1		Crankshaft position (CKP) sensor – circuit malfunction/range/performance problemWiring, CKP sensor, valve timing, ECM
6Engine coolant temperature (ECT) sensor – circuit malfunction/voltage low/highWiring short/open circuit, ECT sensor, ECM
7Throttle position (TP) sensor – circuit malfunction/voltage low/highWiring, TP sensor, ECM
8Crankshaft position (CKP) sensor 2 – malfunctionWiring, CKP sensor, ECM
8Crankshaft position (CKP) sensor 1/2 – connector disconnectionWiring, ECM
8J30A1: Camshaft position (CMP) sensor 1 – malfunctionWiring, CMP sensor, ECM
9Camshaft position (CMP) sensor – intermittent signal/no signalWiring, CMP sensor, ECM
10Intake air temperature (IAT) sensor – circuit malfunction/voltage low/highWiring short/open circuit, IAT sensor, ECM
11Mixture adjustment resistor, without catalyst – circuit malfunctionWiring short/open circuit, mixture adjustment resistor, ECM
12Exhaust gas recirculation (EGR) system – malfunctionWiring, EGR valve/EGR valve position sensor, ECM
13Barometric pressure (BARO) sensor – malfunctionECM
14Idle air control (IAC) valve – malfunctionWiring, IAC valve, ECM
15Ignition output signal – malfunctionWiring, ignition control module, ECM
17Vehicle speed sensor (VSS) – circuit malfunction/range/performance problemWiring, speedometer, VSS, ECM
19AT – lock-up clutch not engaging/gear shift malfunctionWiring, lock-up control solenoid A/B, ECM
20Electrical load sensor – malfunctionWiring, electrical load sensor, ECM
21VTEC system – malfunctionWiring, VTEC solenoid, VTEC pressure switch, ECM
22VTEC system – malfunctionWiring, VTEC solenoid, VTEC pressure switch, ECM
23Knock sensor (KS) – circuit malfunctionWiring, KS, ECM
34Engine control module (ECM) supply voltage – malfunctionWiring, poor connection, battery, alternator
39CAN data bus – malfunctionWiring, connected system, ECM
41Heated oxygen sensor (HO2S) 1, bank 1, heater control – circuit malfunctionFuse, wiring, HO2S, ECM
45System too lean/richFuel system, HO2S, MAP sensor, contaminated fuel, valve clearance, exhaust leak
48Heated oxygen sensor (HO2S) 1, bank 1 – circuit malfunctionWiring, HO2S, ECM
54Engine speed (RPM) fluctuation sensor – intermittent signal/no signalWiring, RPM fluctuation sensor, ECM
56Camshaft position (CMP) actuator, intake/left/front, bank 1 – circuit malfunction/timing over-advanced/system performanceWiring, CMP actuator, ECM
57Camshaft position (CMP) sensor – circuit malfunction/range/performance problemInsecure sensor
58Camshaft position (CMP) sensor 2 – circuit malfunctionWiring, CMP sensor, ECM
60Secondary air injection (AIR) pump – circuit malfunctionFuse, wiring, AIR pump relay, AIR pump, ECM
61Heated oxygen sensor (HO2S) 1, bank 1 – malfunction/slow responseHeating inoperative, wiring, HO2S
63Heated oxygen sensor (HO2S) 2, bank 1 – malfunctionWiring, HO2S, ECM
65Heated oxygen sensor (HO2S) 2, bank 1, heater control – circuit malfunctionWiring, HO2S, ECM
67Catalytic converter system, bank 1 – efficiency below thresholdCatalytic converter, wiring, HO2S 2
70AT – malfunction/lock-up clutch not engaging/no gear shiftWiring, clutch pressure switch, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (SS) A/B/C, ECM
71Cylinder 1 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
71Cylinder 1 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
71Injector 1 – circuit malfunctionWiring, injector, ECM
72Cylinder 2 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
72Cylinder 2 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
72Injector 2 – circuit malfunctionWiring, injector, ECM
73Cylinder 3 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
73Cylinder 3 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
73Injector 3 – circuit malfunctionWiring, injector, ECM
74Cylinder 4 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
74Cylinder 4 – misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
74Injector 4 – circuit malfunctionWiring, injector, ECM
75Random misfireIgnition/fuel system/VTEC system, injector, wiring, mechanical fault
80Exhaust gas recirculation (EGR) system – insufficient flow detectedEGR valve, EGR solenoid, hose leak/blockage
84Secondary air injection (AIR) solenoid – circuit malfunctionWiring, AIR solenoid, ECM
86Engine coolant temperature (ECT) sensor – range/performance problemECT sensor, engine cooling system
89AT – gear shift malfunctionWiring, transmission range (TR) switch, ECM
92Evaporative emission (EVAP) canister purge valve – circuit malfunctionWiring, EVAP valve, ECM

EOBD code

Failure type

00No failure type information
01General electrical failure
02General signal failure
03Frequency modulated (FM)/pulse width modulated (PWM) signal failure
04System internal failure
05System programming failure
06Algorithm based failure
07Mechanical failure
08Data bus signal/message failure
09Component failure
11Short circuit to earth
12Short circuit to positive
13Circuit open
14Open circuit/short to earth
15Open circuit/short to positive
16Circuit voltage below threshold
17Circuit voltage above threshold
18Circuit current below threshold
19Circuit current above threshold
1ACircuit resistance below threshold
1BCircuit resistance above threshold
1CCircuit voltage out of range
1DCircuit current out of range
1ECircuit resistance out of range
1FCircuit intermittent
21Signal amplitude below minimum
22Signal amplitude above maximum
23Signal stuck low
24Signal stuck high
25Signal shape/waveform failure
26Signal rate of change below threshold
27Signal rate of change above threshold
28Signal bias level out of range/zero adjustment failure
29Signal invalid
2ASignal stuck in range
2BSignal cross-coupled
2FSignal erratic
31No signal
32Signal low time below minimum
33Signal low time above maximum
34Signal high time below minimum
35Signal high time above maximum
36Signal frequency too low
37Signal frequency too high
38Signal frequency incorrect
39Signal has too few pulses
3ASignal has too many pulses
41General checksum failure
42General memory failure
43Special memory failure
44Data memory failure
45Program memory failure
46Calibration/parameter memory failure
47Watchdog/safety micro-controller failure
48Supervision software failure
49Internal electronic failure
4AIncorrect component installed
4BOver-temperature condition
51Component not programmed
52Component program not activated
53Component program disabled
54Missing calibration
55System not configured
56Invalid/incompatible configuration
57Invalid/incompatible software component
61Signal calculation failure
62Signal comparison failure
63Circuit/component protection time-out
64Signal plausibility failure
65Signal has too few transitions/events
66Signal has too many transitions/events
67Signal incorrect after event
68Event information
71Actuator stuck
72Actuator stuck open
73Actuator stuck closed
74Actuator slipping
75Emergency position not reachable
76Incorrect mounting position
77Commanded position not reachable
78Alignment or adjustment incorrect
79Mechanical linkage failure
7AFluid leak or seal failure
7BLow fluid level
81Invalid serial data received
82Alive/sequence counter incorrect/not updated
83Value of signal protection calculation incorrect
84Signal below allowable range
85Signal above allowable range
86Signal invalid
87Missing message
88Data bus off
8FSignal erratic
91Component parameter out of range
92Performance problem/malfunction
93No operation
94Unexpected component operation
95Incorrect assembly
96Component internal failure
97Component or system operation obstructed or blocked
98Component or system over-temperature condition
9AComponent or system operating conditions