Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| (F891) 5-VOLT SUPPLY CIRCUIT OPEN |
| (F891) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| A/C PRESSURE TRANSDUCER |
| (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND |
| (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C918) SENSOR RETURN CIRCUIT |
| FRONT CONTROL MODULE |
Always perform PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.