Possible Causes
| Possible Causes |
|---|
| FUSED ASD RELAY OUTPUT CIRCUIT OPEN |
| O2 SENSOR HEATER CONTROL CIRCUIT OPEN |
| O2 SENSOR SIGNAL CIRCUIT OPEN |
| O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .