C1078

C1078-TIRE REVOLUTIONS RANGE PERFORMANCE





When Monitored:

With the ignition on

Set Condition:

When the Anti-Lock Brake Module detects a comparison between the tire circumference value contained in EEPROM and the tire circumference value received on the CAN Bus





Diagnostic Test

1. CHECK FOR A DTC C1078-TIRE REVOLUTIONS RANGE PERFORMANCE





NOTE: This DTC must be active for the results of this test to be valid

Turn the ignition on

With the scan tool, read and record DTC's

With the scan tool, read and record Freeze Fame information

With the scan tool, erase DTC's

Cycle the ignition switch from off to on

With the scan tool, read and record DTC's

Does the scan tool display: C1078-TIRE REVOLUTIONS RANGE PERFORMANCE?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE





Check all related wiring for bruised chafed pierced or partially broken wires.

Check all related connectors for broken bent pushed out or corroded terminals.

Were any problems found?

Yes

- Repair as necessary.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 3

3. CHECK THE (D65) CAN C (+) BUS CIRCUIT AND (D64) CAN (-) BUS CIRCUIT FOR A SHORT TOGETHER





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Measure the resistance between the (D65) CAN C (+) BUS circuit and the (D64) CAN C (-) BUS circuit at the Anti-Lock Brake Module harness connector.

Is the resistance below 150 ohms?

Yes

- Repair the (D65) CAN C (+) BUS circuit and the (D64) CAN C (-) BUS circuit for a short together.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 4

4. CHECK THE (D65) CAN C (+) BUS CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Front Control Module harness connector.

Turn the ignition on.

Using a 12-volt test light connected to 12 volts check the (D65) CAN C (+) BUS circuit.

Does the test light illuminate brightly?

Yes

- Repair the (D65) CAN C (+) BUS circuit for a short to ground.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 5

5. CHECK THE (D65) CAN C (+) BUS CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Front Control Module harness connector.

Turn the ignition on.

Using a 12-volt test light connected to ground check the (D65) CAN C (+) BUS circuit.

Does the test light illuminate brightly?

Yes

- Repair the (D65) CAN C (+) BUS circuit for a short to voltage.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 6

6. CHECK THE (D65) CAN C (+) BUS CIRCUIT FOR AN OPEN CIRCUIT





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Front Control Module harness connector.

Measure the resistance of the (D65) CAN C (+) Bus circuit between the Anti-lock Brake Module and the Front Control Module.

Is the resistance below 5.O ohms?

Yes

- Go To 7

No

- Repair the (D65) CAN C (+) BUS circuit for an open circuit.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

7. CHECK THE (D64) CAN C (-) BUS CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Front Control Module harness connector.

Turn the ignition on.

Using a 12-volt test light connected to 12-volts check the (D64) CAN C (-) BUS circuit.

Does the test light illuminate brightly

Yes

- Repair the (D64) CAN C (-) BUS circuit for a short to ground.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 8

8. CHECK THE (D64) CAN C (-) BUS CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Front Control Module harness connector.

Turn the ignition on.

Using a 12wolt test light connected to ground check the (D64) CAN C (+) BUS circuit.

Does the test light illuminate brightly?

Yes

- Repair the (D64) CAN C (-) BUS circuit for a short to voltage.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 9

9. CHECK THE (D64) CAN C (-) BUS CIRCUIT FOR AN OPEN CIRCUIT





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Front Control Module harness connector.

Measure the resistance of the (D64) CAN C (-) Bus circuit between the Anti-lock Brake Module and the Front Control Module.

Is the resistance below 5.O ohms?

Yes

- Replace the Anti-Lock Brake Module
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Repair the (D64) CAN C (-) BUS circuit for an open circuit.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.