Diagnostic Test

TEST FOR INTERMITTENT CONDITION
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.

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.
(A918) FUSED B (+) CIRCUIT OPEN OR SHORTED

Fig 1: Checking Fused B (+) Circuit Open Or Shorted
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Turn the ignition off.
  NOTE: Check IPM fuses before continuing.
2. Disconnect the Electronic Overhead Module harness connector.
3. Using a 12-volt test light connected to ground, check the (A918) Fused B (+) circuit.
Q: Does the test light illuminate brightly?

Yes :
- Go To 3
No :
- Repair the (A918) Fused B (+) circuit for an open or short.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to ELECTRONIC CONTROL MODULES/MODULE - FRONT CONTROL/DIAGNOSIS AND TESTING).
(Z993) GROUND CIRCUIT OPEN

Fig 2: Checking Ground Circuit Open
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Using a 12-volt test light connected to 12-volts, check the (Z993) ground circuit.
Q: Does the test light illuminate brightly?

Yes :
- Go To 4
No :
- Repair the (Z993) ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to ELECTRONIC CONTROL MODULES/MODULE - FRONT CONTROL/DIAGNOSIS AND TESTING).
(D55) AND (D54) CAN B BUS CIRCUITS OPEN

Fig 3: Checking CAN B Bus Circuits Open
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

NOTE: One open circuit will not cause this condition.
1. Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.
2. Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.
Q: Is there any voltage present on either circuit?

Yes :
- Replace the Electronic Overhead Module in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to ELECTRONIC CONTROL MODULES/MODULE - FRONT CONTROL/DIAGNOSIS AND TESTING).
No :
- Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage.
- Perform BODY VERIFICATION TEST - VER 1 . (Refer to ELECTRONIC CONTROL MODULES/MODULE - FRONT CONTROL/DIAGNOSIS AND TESTING).