Trouble Code Charts
TROUBLE CODE DIAGNOSTIC HINTS (CARBURETED VEHICLES)
| Trouble Code |
Diagnostic Hints |
| 12 |
No RPM (Ignition) Signal to ECU within several seconds after engine is cranked. |
| 21 |
Detects deterioration of oxygen sensor. |
| 22 |
Open or short in coolant temperature sensor/switch signal. |
| 25 |
Open circuit in O2 sensor signal EBCV and/or EACV always open. Short in EBCV signal. |
| 26 |
EBCV always closed or clogged hose. Open circuit in EBCV signal. |
| 31 |
Open or short in vacuum switches signal. |
| 41 |
Open or short in throttle switch signal. |
| 42 |
Open or short in vehicle speed sensor. |
| 71 |
EGR valve normally closed, or clogged hose. Open circuit in EGR temperature sensor signal |
| 72 |
Open circuit in fuel-cut solenoid signal |