Possible Causes
| POSSIBLE CAUSES |
|---|
| FUEL DELIVERY SYSTEM |
| MAP SENSOR, WIRING, OR CONNECTORS |
| DOWNSTREAM O2 SENSOR, WIRING, OR CONNECTORS |
| ENGINE MECHANICAL SYSTEM |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .