Purpose
To determine the following:
• Is the Injector Drive Module (IDM) powered up?
• Is the Electronic Control Module (ECM) powered up?
• Is water in the fuel?
Tools
• None
Procedure
1. Turn ignition switch to ON. (Do not start the engine.) Check or listen for the following:
• WAIT TO START lamp
• WATER IN FUEL lamp (If the Water In Fuel lamp comes on, check for water in fuel filter housing.)
• Injector pre-cycle (Shop noise can drown out the sound of injector pre-cycle.)
• Turbocharger pre-cycle
NOTE: Do not mistake the sound of the instrument panel cycle self-test or the Antilock Brake System (ABS) self-check for injector or turbocharger pre-cycle.
2. If pre-cycle noise was not heard or missed, cycle the ignition switch and listen again.
• If pre-cycle noise is still not heard, the ECM may not be powered up. Check for DTCs. If the EST is not communicating with the ECM, see Electronic Control Module Power (ECM PWR) in Section 7 (page 381).
• If injectors did not pre-cycle, the IDM may not be powered up. Check DTCs and 12–way connector.
• If the water in fuel light is on, check for water in the fuel system. Drain water from the fuel filter housing. Verify that the fuel source is not contaminated.
• If the turbocharger did not pre-cycle, there may be an open circuit. Check the engine 12–way connector. Check for DTCs.
• If the turbocharger and injector pre-cycle, and the WAIT TO START lamp and WATER IN FUEL lamp come on and off, continue to the next diagnostic test.
Possible Causes
No injector pre-cycle
• No key power (vIGN)
• Failed IDM ground circuit
• No power from main power relay to IDM.
• ICP sensor bias high (above 3.45 MPa [500 psi])
• Failed ECM ground circuit
• No power from main power relay to ECM
• CAN 2 link is not working.
• IDM failure
• ECM failure
WAIT TO START lamp does not illuminate
• No key power (vIGN)
• Failed ECM ground circuit
• No power from main power relay to ECM
• ECM failure
• Amber WAIT TO START lamp is out (will not cause hard start or no start).
• CAN 1 link to instrument panel is not working (will not cause hard start or no start).
No turbocharger pre-cycle
• No key power (vIGN)
• No power from ECM main power relay
• Failed actuator power circuit (will not cause hard start or no start)
• Failed actuator power ground circuit (will not cause hard start or no start)
• Failed Variable Geometry Turbocharger (VGT) actuator (will not cause hard start or no start)
• Failed VGT turbocharger (will not cause hard start or no start)
WATER IN FUEL lamp illuminates
• Water in fuel
• Electrical circuit failure
