Fault Condition: FMI 5 indicates there is an open circuit in the starter relay control circuit.
Possible repairs:
Turn the ignition key OFF first.
1) Disconnect the Vehicle Electronic Control Unit (VECU) connector B. With Eaton A/T, disconnect the 20 Starter Enable Relay. Without Eaton A/T, disconnect the 36 Start Cntrl 1 Relay. With Eaton A/T, check for continuity between the Vehicle Electronic Control Unit (VECU) connector B pin 28 and 20 Starter Enable Relay pin 30. Without Eaton A/T, check for continuity between the Vehicle (VECU) connector B pin 28 and 36 Start Cntrl 1 Relay pin 85. If there is NO continuity, repair the circuit between the VECU and the relay.
2) With Eaton A/T, disconnect the Starter Enable Relay and Starter CNTRL 1 Relay. Without Eaton A/T, disconnect the Start Cntrl 1 Relay. With Eaton A/T, check for continuity between the Starter Enable Relay pin 87 and the Starter CNTRL 1 Relay pin 85. With Eaton A/T, check for continuity between the Starter CNTRL 1 Relay pin 85 and a good ground. Without Eaton A/T, check for continuity between the Start Cntrl 1 Relay pin 87 and a
good ground. If there is NO continuity, repair the open in the circuit.
3) Disconnect the Vehicle Electronic Control Unit (VECU) connectors A, B and C. Visually inspect VECU connectors for dirt, loose pins or deformed contacts. If a repairable open is found or the terminal feels loose, repair the harness connector. If the test lead is making good contact with the connector terminal, verify the diagnostic code, the FMI and retest the system. If the FMI 5 is still active, replace the VECU and retest the system.
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