To pull the trouble codes from your 1990 through 1993 Honda Accord you'll need to access the two wire ECU connector located near the passenger side kick panel. You will find a blue connector with one red wire and one green. You will need to insert a paperclip of metal wire between the two prongs. Insert the wire connector while your Honda's ignition is off. After inserting the wire connector/paper clip, turn the ignition on to "ACC ON". The dashboard lights should light up and the check engine light begin flashing. Pay attention to the lights and begin counting the flashes on and off.
You will notice long flashes and short flashes. A long flash indicates the first number of the trouble code. The short flashes indicate the second number of the trouble code. For example... one long flash followed by a pause and two short flashes indicate trouble code 12, which related to the EGR system. A five short flashes and no long flash indicates a fault with the MAP sensor.
Below is a list of all the trouble codes which relate to your 1990 through 1993 Honda Accord.
1 O2A - Oxygen Sensor #1
2 O2B - Oxygen Sensor #2
3 MAP - Manifold Absolute Pressure Sensor
4 CKP - Crankshaft Position Sensor
5 MAP - Manifold Absolute Pressure Sensor
6 ECT - Engine Coolant Tempretrure Sensor
7 TPS - Throttle Position Sensor
8 TDC - Top Dead Center Sensor
9 CYP - Cylinder Sensor
10 IAT - Intake Air Temperature Sensor
12 EGR - Exhaust Gas Recirculation Valve Sensor
13 BARO - Atmospheric Pressure Sensor
14 IAC (EACV) - Idle Air Control Valve
15 Ignition Output Signal Trouble
16 Fuel Injector Trouble
17 VSS - Vehicle Speed Sensor
19 Automatic Transmission Lockup Control Valve
20 Electrical Load Fault
21 VTEC Solenoid Valve
22 VTEC Pressure Valve
23 Knock Sensor Trouble
30 Automatic Transmission A Signal Fault
31 Automatic Transmission B Signal Fault
41 Oxygen Sensor Heater
43 Fuel Supply System Fault
45 Fuel System Too Rich / Too Lean
48 LAF - Lean Air Fuel Sensor
54 CKF - Crank Fluctuation Sensor
58 TDC Sensor #2
61 Primary Oxygen Sensor
63 Secondary Oxygen Sensor
65 Secondary Oxygen Sensor Heater
71 Random Misfire Cylinder 1
72 Random Misfire Cylinder 2
73 Random Misfire Cylinder 3
74 Random Misfire Cylinder 4
80 Exhaust Gas Recirculation Insufficient Flow Detected
86 ECT Sensor (Engine Coolant Temperature) Circuit Range Fault
90 Evaporative Emission Control System Leak Detected in the Fuel Tank
91 Fuel Tank Pressure Sensor Low Input
92 Evaporative Emission Control System Insufficient Purge Flow
Should you want to reset the ECU (Clear Trouble Codes), follow the ECU Reset Procedure below:
A. Disconnect your Honda Accord's negative battery terminal.
B. Open the fuse box located under the hood and pull out the ECU fuse.
C. Keep the battery and ECU fuse disconnected for 5-10 minutes.
D. Reinsert the ECU fuse and reattach the negative battery terminal.
E. Start your Honda Accord. The check engine light should now be off. If the CEL is still on, this indicates your Honda Accord has a "hard" fault which is causing the CEL to turn on immediately once the engine is started. Try the reset procedure again. You may need to retrieve the trouble code(s) and diagnose the fault(s) if the CEL won't turn off after a second reset.
