Spectrum 3.0L GM, Руководство по запчастям и обслуживанию

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38
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.