Alternative Fuel Control Module: Service and Repair
ALTERNATIVE FUEL MODULE ASSEMBLY REPLACEMENTTOOLS REQUIRED
J 41416 Ultrasonic Leak Detector
REMOVAL PROCEDURE
1. Relieve the CNG fuel system pressure. Refer to Fuel Pressure Relief Procedure.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
2. Disconnect the negative battery cable.
3. Remove the throttle cables from the retaining clip.
4. Remove the gas distribution adapter.
5. Disconnect the fuel inlet line from the low pressure lock-off (LPL) solenoid.
6. Disconnect the wiring harness connectors.
7. Remove the AF module assembly bracket nuts and the bolts.
8. Remove the module assembly.
DISASSEMBLY PROCEDURE
1. Remove the fuel line between the LPL and the LPR.
2. Loosen the hose clamps on the vapor hose between the LPR and the GMS/MCV.
3. Remove the GMS/MCV and the bracket from the module bracket as an assembly.
4. Remove the LPR from the module plate.
5. Remove the LPL and the bracket from the module bracket as an assembly.
ASSEMBLY PROCEDURE
NOTE: Refer to Fastener Notice in Service Precautions.
1. Install the LPL and the bracket as an assembly to the module bracket.
Tighten
Tighten the LPL bracket nuts to 12 N.m (108 lb in).
2. Install the LPR to the module bracket.
Tighten
Tighten the LPR bolts to 12 N.m (108 lb in).
3. Install the GMS/MCV and the bracket to the module bracket.
Tighten
Tighten the GMS/MCV bracket nuts to 12 N.m (108 lb in).
4. Install the hose clamps on the vapor hose between the LPR and the GMS/MCV.
Tighten
Tighten the hose clamps to 2 N.m (18 lb in).
5. Replace the O-rings in the CNG fuel line between the LPL and the LPR. Lubricate the O-rings with petroleum jelly or the equivalent.
Tighten
Tighten the fuel line fittings to 24 N.m (18 lb ft).
INSTALLATION PROCEDURE
NOTE: Refer to Fastener Notice in Service Precautions.
1. Install the module.
Tighten
^ Tighten the module bracket flange nut to 9 N.m (84 lb in).
^ Tighten the module bracket bolts to 24 N.m (18 lb ft).
2. Install the gas distribution adapter.
3. Connect the electrical connectors. Route the connectors through the clips.
4. Connect the fuel line to the LPL using a new O-ring. Lubricate the O-ring with petroleum jelly or the equivalent.
Tighten
Tighten the fuel line fitting to 24 N.m (18 lb ft).
5. Install the throttle cables to the retaining clip.
6. Connect the negative battery cable.
Tighten
Tighten the bolt to 15 N.m (11 lb ft).
7. Start the engine. Inspect for CNG fuel leaks at each serviced fitting using the J 41416.