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 ECU view.
  NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
Q: Does the scan tool display a red X next to the module?

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 (A918) Fused B(+) Circuit
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 DIAGNOSIS AND TESTING ).
(Z993) GROUND CIRCUIT OPEN

Fig 2: Checking (Z993) Ground Circuit
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 DIAGNOSIS AND TESTING ).
(D55) AND (D54) CAN B BUS CIRCUITS OPEN

Fig 3: Measuring Voltage Between (D54) CAN B BUS (-) Circuit And Ground
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 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 DIAGNOSIS AND TESTING ).