Possible Causes
| Possible Causes |
|---|
| POWERTRAIN CONTROL MODULE (PCM) OR COMMUNICATION DTCS |
| FUSED B+ CIRCUIT OPEN |
| ELECTRIC VACUUM PUMP OUTPUT CIRCUIT OPEN |
| ELECTRIC VACUUM PUMP OUTPUT CIRCUIT SHORTED TO GROUND |
| GROUND CIRCUIT OPEN |
| PINCHED, CUT OR OPEN VACUUM SUPPLY LINE |
| ANTI-LOCK BRAKE SYSTEM (ABS) MODULE |
| POWERTRAIN CONTROL (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .