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ECU CODES ALL MODELS
collected by ACCORD EX
ECU : is the Engine Computer Unit which controls a lot of engine work they are available in EFI ( Electronic Fuel Injecion ) Cars !
just look under the driver's seat and count how many times does the light blinks and look for the corresponding problem in the table below !
| Code | Accord | Civic | CRX | Prelude | Error |
| 1 | 85-98 | 86-98 | 85-91 | 85-98 | Oxygen Sensor "A"
(Primary) defective circuit or unplugged / defective sensor |
| 2 | 85-89 | 86-87 | 85-87 | NA | Oxygen Sensor "B" defective circuit or unplugged / defective sensor |
| 3 | 85-98 | 86-98 | 85-91 | 85-98 | MAP Sensor (Manifold Absolute
Pressure) defective circuit or unplugged / defective sensor |
| 4 | 90-98 | 88-98 | 88-91 | 85-98 | CKP Sensor (Crankshaft Position
Sensor) defective circuit or unplugged / defective sensor |
| 5 | 85-98* | 86-98 | 85-91 | 85-98 | MAP Sensor (Manifold Absolute
Pressure) mechanical problem / disconnected piping * exc 94-95 |
| 6 | 85-98 | 86-98 | 85-91 | 85-98 | ECT Sensor (Engine Coolant
Temperature) defective circuit or unplugged / defective sensor |
| 7 | 85-98 | 86-98 | 85-91 | 85-98 | TP Sensor (Throttle Position) defective circuit or unplugged / defective sensor |
| 8 | 85-98 | 86-98 | 85-91 | 85-98 | TDC Sensor (Top Dead Center) defective circuit or unplugged / defective sensor |
| 9* | 85-98** | 86-98 | 85-91 | 85-98 | CYP Sensor (Cylinder) defective circuit or unplugged / defective sensor * not a valid code for any throttle body injection Hondas ** not a valid code for V-6 engines |
| 10 | 85-98 | 86-98 | 85-91 | 85-98 | IAT Sensor (Intake Air Temperature) defective circuit or unplugged / defective sensor |
| 12 | 85-98 | 86-98* | 85-91* | 85-98 | EGR Lift Sensor (Exhaust Gas
Recirculation) defective circuit or unplugged / defective sensor * not a valid code if car is not equipped with an EGR valve (some Civic models are not) |
| 13 | 85-98 | 86-98 | 85-91 | 85-98 | BARO Sensor (Atmospheric Pressure) defective circuit or unplugged / defective sensor |
| 14 | 88-98 | 88-98 | 88-91 | 88-98 | IAC Valve (Idle Air Control) defective circuit or unplugged / defective sensor |
| 15 | 90-95 | 88-95 | 88-91 | 88-95 | Ignition Output Signal missing or defective ignition output signal |
| 16 | 90-95 | 88-95 | 88-91 | 88-95 | Fuel Injector System defective circuit or unplugged / defective fuel injector |
| 17 | 88-98 | 88-98 | 88-91 | 88-98 | VSS (Vehicle Speed Sensor) defective circuit or unplugged / defective sensor |
| 19 | NA | 88-95 | 88-91 | NA | Automatic Transmission Lock Up
Control Solenoid Valve defective circuit or unplugged / defective solenoid valve |
| 20 | 90-98 | 88-98 | 88-91 | 92-98 | Electrical Load Detector defective circuit or unplugged / defective sensor |
| 21* | 94-98** | 92-95 | NA | 93-95 | VTEC Solenoid Valve defective circuit or unplugged / defective solenoid valve * not a valid code if car does not have a VTEC engine ** not with V-6 engine |
| 22* | 94-98 | 92-98 | NA | 92-98 | VTEC Oil Pressure Switch defective circuit or unplugged / defective oil pressure switch * not a valid code if car does not have a VTEC engine |
| 23 | 98* | 96-98 | NA | 92-98 | KS (Knock Sensor) defective circuit or unplugged / defective sensor * not a valid code if V-6 engine |
| 30 | 90-98* | NA | NA | 92-98* | Automatic Transmission Signal:
"A" / SEAF / SEFA / TMA or TMB defective circuit or unplugged / defective sensor * not a valid code for 1996 |
| 31 | 90-95 | NA | NA | 92-95 | Automatic Transmission Signal
"B" defective circuit or unplugged / defective sensor |
| 41 | 90-98 | 92-98 | NA | 90-98 | Primary Oxygen Sensor - Heater circuit malfunction |
| 43 | 90-95 | 92-95 | NA | 90-95 | Fuel Supply System defective or malfunctioning fuel supply system |
| 45 | 96-98 | 96-98 | NA | 96-98 | System Too Lean or Too Rich malfunction in the fuel monitoring systems |
| 48 | 98 | 92-98 | NA | NA | LAF Sensor (Lean Air Fuel) defective circuit or unplugged / defective sensor |
| 54 | 96 | 96-98 | NA | NA | CKF Sensor (Crankshaft Speed
Fluctuation) defective circuit or unplugged / defective sensor |
| 58 | 98* | NA | NA | NA | TDC Sensor 2 (Top Dead Center) defective circuit or unplugged / defective sensor * with V-6 engine only |
| 61 | 96-98 | 96-98 | NA | 96-98 | Oxygen Sensor, Heated - Sensor 1
(Primary) high voltage, low voltage, or slow response |
| 63 | 96-98 | 96-98 | NA | 96-98 | Oxygen Sensor, Heated - Sensor 2
(Secondary) high voltage, low voltage, or slow response |
| 65 | 96-98 | 96-98 | NA | 96-98 | Oxygen Sensor Heater (Secondary) malfunctioning or defective oxygen sensor heater |
| 67 | 96-98 | 96-98 | NA | 96-98 | Catalyst system Efficiency Below
Threshold malfunctioning or defective catalyst system |
| 70 | 96-98 | 96-98 | NA | 96-98 | Automatic Transmission malfunction with the automatic transmission controls |
| 71 | 96-98 | 96-98 | NA | 96-98 | Cylinder 1 Misfire or a Random
Misfire a condition is present that is creating a cylinder misfire |
| 72 | 96-98 | 96-98 | NA | 96-98 | Cylinder 2 Misfire or a Random
Misfire a condition is present that is creating a cylinder misfire |
| 73 | 96-98 | 96-98 | NA | 96-98 | Cylinder 3 Misfire or a Random
Misfire a condition is present that is creating a cylinder misfire |
| 74 | 96-98 | 96-98 | NA | 96-98 | Cylinder 4 Misfire or a Random
Misfire a condition is present that is creating a cylinder misfire |
| 75 | 98* | NA | NA | NA | Cylinder 5 Misfire or a Random
Misfire a condition is present that is creating a cylinder misfire * valid code for V-6 engine only |
| 76 | 98* | NA | NA | NA | Cylinder 6 Misfire or a Random
Misfire a condition is present that is creating a cylinder misfire * valid code for V-6 engine only |
| 80 | 96-98 | 96-98 | NA | 96-98 | Exhaust Gas Recirculation insufficient flow detected |
| 86 | 96-98 | 96-98 | NA | 96-98 | ECT Sensor (Engine Coolant
Temperature) circuit range / performance problem |
| 90 | 97-98 | 96-98 | NA | 97-98 | Evaporative Emission Control System leak detected in the fuel tank area |
| 91 | 96-98 | 96-98 | NA | 97-98 | Fuel Tank Pressure Sensor low input |
| 92 | 96-98 | 96-98 | NA | 96-98 | Evaporative Emission Control System insufficient purge flow |
