30
LPG FUEL SYSTEM DIAGNOSTICS
Step Action Value(s) Yes No
1
Were you referred to this procedure by a DTC diagnostic
Chart?
Go to Step
(3)
Go to
Step (2)
2
Connect the Diagnostic Scan Tool (DST) to the ECM Data Link
Connector (DLC) and check for any DTCs.
Are any DTCs present in the ECM?
Go to appli-
cable DTC
Table
Go to
Step (3)
3
Perform the following visual and physical preliminary checks:
Check all ECM system fuses and circuit breakers (refer to
Engine Wiring Schematic).
Check the ECM grounds for being clean, tight and in their
proper locations (refer to Engine Wiring Schematic).
Check the vacuum hoses for damage, splits, kinks and prop-
er connections.
Check the fuel system for any type of leak or restriction from
the supply tank.
Check for air leaks at all mounting areas of the intake mani-
fold sealing surfaces.
Check for air leaks at all intake ducting between intake mani-
fold and air cleaner.
Check air cleaner and all vehicle intake ducting for restric-
tions.
Check exhaust system for flow obstructions or leaks.
Check the ignition wires for the following conditions:
Cracking or hardening
Proper routing
Bare or shorted wires
Carbon tracking
Check the wiring harness for the following conditions:
Proper connections
Pinches
Cuts or abrasions
Were any faulty conditions found in the preliminary checks?
Correct
the faulty
condition
and Go to
Step 20
Go to
Step (4)
4 Does the vehicle start and run?
Go to Step
(9)
Go to
Step (5)
5
Check the fuel system for the following conditions:
Verify the LPG fuel tank is at least ¼ full.
Verify the manual fuel shut-off valve is open and operating
correctly.
Verify the high-flow valve has not tripped.
Verify the quick disconnect is fully engaged and there are no
kinks or obstructions in the high pressure LPG supply hose.
Verify the LPG fuel filter is clean and unobstructed.
Were any faulty conditions found in the fuel supply system?
Correct
the faulty
condition
and Go to
Step 20
Go to
Step (6)
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