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NO START
Checks Action
DEFINITION: The engine cranks OK but does not start.
Preliminary Checks None
ECM Checks
Use the DST to :
Check for proper communication with both the ECM
Check all system fuses engine fuse holder. Refer to Engine Controls
Schematics.
Check battery power, ignition power and ground circuits to the ECM. Re-
fer to Engine Control Schematics. Verify voltage and/or continuity for
each.
Sensor Checks
Check the TMAP sensor.
Check the cam/crank sensors for output (rpm). This can be verified by an
RPM signal on the DST.
Check the cam angle sensor for output (rpm).
Fuel System Checks
Verify proper operation of the Shut-off solenoid Valves.
Important: A closed Gas supply valve will create a no start condition.
Check for air intake system leakage around the Regulator and throttle
body.
Check the fuel system pressures.
Refer to the Fuel System Diagnosis.
Ignition System Checks
NOTE: Natural Gas and Propane require higher secondary ignition system
voltages for the equivalent gasoline operating conditions.
1. Check for the proper ignition voltage output with J 26792 or the equiva-
lent.
2. Verify that the spark plugs are correct.
Check the spark plugs for the following conditions:
Wet plugs (Oil Fouling)
Cracks.
Wear.
Improper gap.
Burned electrodes.
Heavy deposits.
Check for bare or shorted ignition wires.
Check for loose ignition coil connections at the coil.
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