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Circuit Description When you turn ON the ignition switch, the Vehicle Control Module (VCM) turns ON the in-tank fuel pump. The pump remains ON as long as the engine is cranking or running and the VCM is receiving reference pulses. If there are no reference pulses, the VCM shuts the fuel pump OFF within 2 seconds after the ignition was switched to the ON position or if the engine stops. The VCM will also turn ON the fuel pump for 2 seconds when the ignition is turned to the OFF position. An electric fuel pump pumps the fuel through an in-line filter to the Central SFI unit. The pump is attached to the fuel level meter assembly inside of the fuel tank. The pump is designed to provide fuel pressure above what is needed by the fuel injectors. The pressure regulator keeps the fuel available to the injectors at a regulated pressure. Unused fuel is returned to the fuel tank by the fuel return pipe. Diagnostic Aids Tools Required • J 34730-1A Fuel Pressure Gage in J 34730-E or • J 34730-1A Fuel Pressure Gage with J 34730-250 Fuel Pressure Adapter Kit. Test Description The numbers below refer to the step numbers on the diagnostic table. 2. Wrap a shop towel around the fuel pressure connection to absorb any small amount of fuel leakage that may occur when installing the fuel pressure gauge. Turn ON the ignition, the fuel pressure should be 415-455 kPa (60-66 psi) for the Central SFI and 385-430 kPa (56-62 psi) for

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Removal Procedure 1. If necessary, remove the engine sight shield.2. Disconnect the oil pressure sensor electrical connector (1).3. Using J41712 or equivalent, remove the oil pressure sensor. Installation Procedure 1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the oil pressure sensor.2. Using J41712 or equivalent, install the oil pressure sensor. Tighten the oil pressure sensor to 20 Nm (15 ft. lbs.).3. Connect the oil pressure sensor electrical connector (1). 4. If necessary, install the engine sight shield.

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REMOVAL: 1. 2. 3. 4. Remove distributor cap and rotor. Remove two module attaching screws, and lift module up. Disconnect leads from module. Observe color code on leads as these cannot be interchanged. Remove module. INSTALLATION: NOTE: Be sure there is a sufficient amount of silicone grease on the metal face of the module and on the distributor base (where the module seats), when reinstalling the module. The purpose of the silicone grease is to cool the module. 1. 2. 3. 4. 5. Install module. Connect leads to module. Install module attaching screws. Install pick up coil. Install cap and rotor.

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REMOVAL PROCEDURE 1. Open the front door. 2. Release the upper extension by pulling outward in order to release the upper retainer clip. 3. Remove the upper extension from the trim panel by lifting up and out. INSTALLATION PROCEDURE 1. Position the lower retainer to the trim panel. 2. Align the upper retainer clip to the door frame. 3. Install the upper extension by pressing into place until fully seated.

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Subject: Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set (Replace Rear Bank Knock Sensor and RTV Area Around Sensor) Models: 1998-2002 Chevrolet Camaro, Corvette 1998-2002 Pontiac Firebird with 5.7L Engine (VIN G – RPO LS1) 1999-2002 Chevrolet Silverado, Suburban, Tahoe 2002 Chevrolet Avalance 1999-2002 GMC Sierra, Yukon, Yukon XL 2002 Cadillac Escalade, Escalade EXT with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U – RPOS LR4, LM7, L59, L09, L04) This bulletin is being revised to add Cadillac Escalade and Cadillac Escalade EXT to the Models. Please discard Corporate Bulletin Number 02-06-04-023 (Section 6 – Engine/Propulsion System). Condition Some customers may comment on a mild to severe engine ping (commonly referred to as spark knock), usually worse during acceleration and/or an illuminated MIL. Upon investigation, the technician may find DTC P0332 set. Cause This condition may be the result of corrosion of the rear bank knock sensor due to water intrusion into the sensor cavity. This condition is more apparent on vehicles in which customers frequently wash the engine compartment