HOW TO DIAGNOSE HONDA OBD1 2 PIN SOCKET

HOW TO READ OBD1 CODES ON HONDA 16 PIN DLC

How to read codes

LEASE NOTE:If after following the instructions below the Check Engine Light does not flash it either means there are no fault codes or there is a connection error. To test connection, remove the TPS and run the engine then recheck codes.

  • If possible run the engine to bring the oxygen sensor up to operating temperature then switch the engine off.
  • Connect the terminals using your own jumper wire,  , as shown in the diagram.HOW TO READ OBD1 CODES ON HONDA 16 PIN DLC
  •  Turn ignition ON.
  •  If the Check Engine Light (CEL) flashes, read codes as described in the Code Format Description below.
  • Press the continue button to enter the code numbers and get the code description.

Code Format

Code Format HONDA

Read Code Format

  • Each code is made up of two series of flashes.
  • The long flashes indicate the ‘tens’ digits.
  •  The short flashes indicate the ‘ones’ digits.
  • A long pause separates each code sequence.
  • Code Format Diagram shows code No. 12.
  •  If nolongflashes are observed then the code is a straight count of short flashes. i.e. 4 flashes = code 4.

Erasing codes

  • 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)

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

 

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