Possible Causes
| 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 |
| EXCESSIVE RESISTANCE IN THE (C18) A/C PRESSURE SIGNAL CIRCUIT |
| FRONT CONTROL MODULE (FCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.