Trouble Code Charts - CARBURETED Models
PICKUP (WITH 22R) TROUBLE CODE IDENTIFICATION
| Code No. | System Affected | Probable Cause |
|---|---|---|
| No Code | System Normal | System Normal |
| 12 | RPM Signal | Ignition Coil or Coil Circuit Ignitor or Ignitor Circuit, ECU |
| 21 | O2 Sensor Signal | O2 Sensor or Circuit, ECU |
| 22 | Coolant Temp. Sensor Signal | Coolant Temp. Sensor or Circuit, ECU |
| 25 | Lean Air/Fuel Mix | Oxygen Sensor or Sensor Circuit, Electronic Bleed Air Control Valve (EBCV) or Circuit, Electronic Air Control Valve (EACV) or Circuit, ECU |
| 26 | Rich Air/Fuel Mixture | Oxygen Sensor or Sensor Circuit, Electronic Bleed Air Control Valve (EBCV) or Circuit, Electronic Air Control Valve (EACV) or Circuit, EBCV Hose, ECU |
| 31 | Vacuum Switch Signal | No. 1, 2 & 3 Vacuum Switches or Switch Circuits, EGR |
| 42 | Vehicle Speed Sensor Signal | Speed Sensor or Circuit, ECU |
| 71 | EGR System Malfunction | EGR System, EGR Temperature Sensor, ECU |
| 72 | Fuel-Cut Solenoid | Fuel-Cut Solenoid or Solenoid Circuit, ECU |