Diagnostic Test

1. Turn the ignition on.
   NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, select System select.
   NOTE: If an ECU is grayed out, it is not communicating, indicating that the module is not active on the Bus network.
   NOTE: Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding.

Q: Is the ECU grayed out? 

Yes : 

• Go To 2

No : 

• The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

1. With the scan tool in ECU view, observe the status of the PCM.

Q: Is the PCM grayed out? 

Yes : 

• Refer to the *NO RESPONSE FROM PCM (POWERTRAIN CONTROL MODULE)  test procedure.

No : 

• Go To 3

Fig 1: Checking Ground Circuit Open

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

1. Turn the ignition off.
2. Disconnect the PCM C4 harness connector.
   CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
3. Using a 12-volt test light connected to 12-volts, check each (Z908), (Z977), and (Z904) ground circuits.

Q: Does the test light illuminate brightly for each circuit? 

Yes : 

• Replace and program the Powertrain Control Module in accordance with the service information.
• Perform POWERTRAIN VERIFICATION TEST .

No : 

• Repair the ground circuit for an open.
• Perform the appropriate TRANSMISSION VERIFICATION TEST.