Possible Causes
| Possible Causes |
|---|
| INTAKE O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND |
| INTAKE O2 SENSOR RETURN CIRCUIT SHORTED TO GROUND |
| INTAKE O2 POSITIVE CURRENT CONTROL CIRCUIT SHORTED TO GROUND |
| INTAKE O2 PUMP CURRENT CIRCUIT SHORTED TO GROUND |
| INTAKE O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .