C1239

C1239-EMISSION ROLLS TEST ACTIVE

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

- When Monitored:
Continuously with the ignition on and no BUS communication failure DTCs present.

- Set Condition:
If the Anti-lock Brake System (ABS) Module receives two messages in a row indicating that the extended diagnostic session is active. ABS is inhibited during the extended diagnostic session.





1. DTC IS PRESENT

NOTE: Make sure the battery is fully charged.

1. Ignition on, engine not running.
2. With the scan tool clear DTCs.
3. Turn ignition off to the lock position.
4. Ignition on, engine not running.
5. With the scan tool read DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION diagnostic procedure. ABS Intermittent Condition Test.

2. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Ignition on, engine not running.
2. With the scan tool, read DTCs in each module on the CAN B BUS and the CAN C BUS.

Are there CAN BUS communication DTCs present in any other module?

Yes

- Perform the appropriate diagnostic procedure.Testing and Inspection

No

- Replace the Anti-lock Brake System (ABS) Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.