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.

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.

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 .

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 .

Fig 3: Checking CAN B Bus Circuits Open

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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 .

No : 

• Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage.
• Perform BODY VERIFICATION TEST - VER 1 .