Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Trouble Code Definitions
If codes other than those listed are indicated, verify the code. See DIAGNOSTIC TROUBLE CODE DEFINITIONS table. If the code indicated is not listed, replace the ECU. The Check Engine light may come on, indicating a system problem, when, in fact, there is a poor or intermittent electrical connection. First, check the electrical connections, clean or repair connections if necessary. If the Check Engine light is on while the engine is running, jump the service check connector. If no code is displayed (Check Engine light stays on steady), the back-up system is in operation. Replace ECU and recheck. If the indication goes away, replace the original ECU.
The Check Engine light and DRIVE gear indicator light may come on simultaneously when the self-diagnosis indicator blinks 6, 7 and 17. Check the PGM-FI system according to the PGM-FI control system troubleshooting and recheck the DRIVE gear indicator light. To check DRIVE gear indicator light, see TRANSMISSION service information. The Check Engine light and TCS indicator light may come on simultaneously when the self-diagnosis indicator blinks 3, 5, 6, 13, 15, 16, 17, 35 and 36. Check the PGM-FI system according to the PGM-FI control system troubleshooting and recheck the TCS indicator light. If it comes on, see TROUBLESHOOTING in ANTI-LOCK article in BRAKES.
The Check Engine light does not come on when there is a malfunction in the A/T FI signal. However, when the two terminals of the service check connector are connected with a jumper wire, the Check Engine light will indicate the codes.
| DTC | Definition | ||||
|---|---|---|---|---|---|
| 0 (1) | ECU | ||||
| 1 | Front Oxygen Sensor | ||||
| 2 | Rear Oxygen Sensor | ||||
| 3 | MAP Sensor | ||||
| 4 | CRANK Position Sensor "A" | ||||
| 5 | MAP Sensor | ||||
| 6 | TW Sensor | ||||
| 7 | Throttle Angle | ||||
| 9 | No. 1 CYL Position Sensor "A" | ||||
| 10 | TA Sensor | ||||
| 12 | EGR System | ||||
| 13 | PA Sensor | ||||
| 14 | EACV System | ||||
| 15 | Ignition Output Signal | ||||
| 16 | Fuel Injector | ||||
| 17 | Vehicle Speed Sensor | ||||
| 18 | Ignition Timing Adjustment | ||||
| 21 | Front VTEC Solenoid Valve | ||||
| 22 | Front VTEC Oil Pressure Switch | ||||
| 23 | Front Knock Sensor | ||||
| 30 | A/T FI Signal "A" | ||||
| 31 | A/T FI Signal "B" | ||||
| 35 (2) | Traction Control STB Signal | ||||
| 36 (2) | Traction Control FC Signal | ||||
| 41 | Front Oxygen Sensor Heater | ||||
| 42 | Rear Oxygen Sensor Heater | ||||
| 43 | Front Fuel Supply System | ||||
| 44 | Rear Fuel Supply System | ||||
| 45 | Front Fuel Metering | ||||
| 46 | Rear Fuel Metering | ||||
| 47 | Fuel Pump | ||||
| 51 | Rear VTEC Solenoid Valve | ||||
| 52 | Rear VTEC Oil Pressure Switch | ||||
| 53 | Rear Knock Sensor | ||||
| 54 | Crank Sensor "B" | ||||
| 59 | No. 1 CYL Position Sensor "B" | ||||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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