C1252

C1252-92-VACUUM PUMP CONTROL CIRCUIT - PERFORMANCE OR INCORRECT OPERATION

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The Powertrain Control (PCM) has indicated that there is a Vacuum Pump failure.





NOTE: If any PCM DTCs are present, repair them first before continuing with this diagnostic procedure.
CHECK FOR ANY ENGINE DTCs
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs in the PCM.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs in the PCM.

Are there any PCM DTCs?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection.

No

- Using the schematics as a guide, check the Anti-lock Brake System (ABS) Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Anti-lock Brake Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.