C0078

C0078-86-TIRE DIAMETER - SIGNAL INVALID

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

- When Monitored:
With the ignition on.

- Set Condition:
The DTC will set if the stored tire size is out of range or has changed from the previous initialization.





Diagnostic Test

1. INCORRECT TIRES PROGRAMMED INTO BCM





1. Inspect all four tires on the vehicle and note the size of each tire.

NOTE: A non-production size tire cannot be programmed into the BCM. The production Powertrain, with the production size tires, is the only emissions certified configuration that is available for reprogramming.

2. Verify the correct Tire/wheel information is programmed in the BCM.

Is the correct value programmed in the BCM according to the chart?

Yes

- Go To 2

No

- Program the correct Tire/Wheel information in the BCM.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

2. PERFORM ABS MODULE INITIALIZATION
1. Turn the ignition on.
2. With the scan tool, read and record the ABS DTCs.

WARNING:
To avoid possible serious or fatal injury, check brake capability is available before road testing.

3. Perform the ABS Module initialization, Perform the ABS VERIFICATION TEST. ABS Verification Test.

NOTE: The ABS Module Initialization process must include driving the vehicle into a 90° turn.

4. Park the vehicle.
5. With the scan tool, read the DTCs.

Does the DTC remain active?

Yes

- Perform the ABS Module Initialization routine again, if still unsuccessful.
- Replace the Anti-Lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Test complete.