Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase FCM DTC's.
3. Cycle the ignition from on to off 3 times.
4. Turn the ignition on.
5. With the scan tool, read active FCM DTC's.
Q: Does the scan tool display U0001-CAN C BUS CIRCUIT as active?

Yes :
- Go To 2
No :
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
ANTILOCK BRAKE MODULE - INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the Antilock Brake Module harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase FCM DTC's.
5. Cycle the ignition from on to off 3 times.
6. Turn the ignition on.
7. With the scan tool, read active FCM DTC's.
Q: Does the scan tool display U0001-CAN C BUS CIRCUIT as active?

Yes :
- Go To 3
No :
- Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Antilock Brake Module in accordance with the service information.
- Perform ABS VERIFICATION TEST - VER 1.
POWERTRAIN CONTROL MODULE - INTERNAL SHORT
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module C1 harness connector.
3. Turn the ignition on.
4. With the scan tool, record and erase FCM DTC's.
5. Cycle the ignition from on to off 3 times.
6. Turn the ignition on.
7. With the scan tool, read active FCM DTC's.
Q: Does the scan tool display U0001-CAN C BUS CIRCUIT as active?

Yes :
- Go To 4
No :
- Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Powertrain Control Module in accordance with the service information.
- Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Between (D65) CAN C BUS (+) Circuit And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Turn the ignition off.
2. Disconnect the Front Control Module C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.
Q: Is there any voltage present?

Yes :
- Repair the (D65) CAN C Bus (+) circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to DIAGNOSIS AND TESTING ).
No :
- Go To 5
(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE

Fig 2: Measuring Voltage Between (D64) CAN C BUS (-) Circuit And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Measure the voltage between the (D64) CAN C Bus (-) circuit and ground.
Q: Is there any voltage present?

Yes :
- Repair the (D64) CAN C Bus (-) circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to DIAGNOSIS AND TESTING ).
No :
- Go To 6
(D65) CAN C BUS (+) CIRCUIT SHORTED TO
GROUND

Fig 3: Measuring Resistance Between Ground And (D65) CAN C BUS (+) Circuit
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Turn the ignition off.
2. Measure the resistance between ground and the (D65) CAN C Bus (+) circuit.
Q: Is any resistance present?

Yes :
- Repair the (D65) CAN C Bus (+) circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to DIAGNOSIS AND TESTING ).
No :
- Go To 7
(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND

Fig 4: Measuring Resistance Between Ground And (D64) CAN C BUS (-) Circuit
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.
Q: Is any resistance present?

Yes :
- Repair the (D64) CAN C Bus (-) circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to DIAGNOSIS AND TESTING ).
No :
- Go To 8
(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT

Fig 5: Measuring Resistance Between (D65) CAN C BUS (+) Circuit And (D64) CAN C BUS (-) Circuit
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Measure the resistance between the (D65) CAN C Bus (+) circuit and the (D64) CAN C Bus (-) circuit.
Q: Is any resistance present?

Yes :
- Repair the (D65) CAN C Bus (+) circuit for a short to the (D64) CAN C Bus (-) circuit.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to DIAGNOSIS AND TESTING ).
No :
- Inspect the wiring and connectors for damage or shorted circuits. Ensure both CAN C Bus circuits are not open at the FCM. If OK, replace and program the Front Control Module in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to DIAGNOSIS AND TESTING ).