144 5 HARD START AND NO START DIAGNOSTICS
Test Procedures
1. Initial Ignition Switch ON ( D o not start)
Figure 166
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
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, read all safety instructions in the “Safety
Information” section of this manual.
1. Turn ignition switch to ON. (Do not start the
engine.) Check or listen for the following:
•WAITTOSTARTlamp
• 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 w ater from the fu el
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 Caus es
No injector pre-cycle
• No key power (v
IGN
)
• Failed IDM g rou nd 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 (v
IGN
)
• 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).
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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