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The Crankshaft Position (CKP) sensor is a magnetic generator type sensor. The sensor produces an alternating current signal. The CKP sensor sends the A/C signal to the Powertrain Control Module (PCM) in order to indicate the crankshaft RPM and the position. The PCM uses the CKP sensor signal in order to calculate the following: ^ The ignition sequence ^ The fuel injector sequence ^ Fuel injectors pulse width If the PCM does not receive a CKP sensor signal, the engine will not start. CONDITIONS FOR SETTING THE DTC ^ The engine is cranking. ^ The signal from the CKP sensor is missing for 2 seconds. ACTION TAKEN WHEN THE DTC SETS ^ The PCM illuminates the malfunction indicator lamp (MIL). ^ The PCM records the operating conditions at the time of the diagnostic failure. This information is in the Freeze Frame buffer. CONDITIONS FOR CLEARING THE MIL/DTC The MIL turns OFF after three consecutive trips during which the diagnostic runs, and the fault is not present. A History DTC clears after 40 consecutive warm-up cycles without a fault. Use a scan tool clear the DTC. Disconnect the PCM battery feed in order to clear the DTC

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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

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Remove or Disconnect (Figures 5 through 10 and Figure 20) 1. Battery ground cable. 2. Coolant recovery tank. 3. Heater core hoses (140 and 141) (figures 6, 7, 8 and 20). ^ Place a clean pan under the vehicle to catch any coolant spillage. ^ Plug the hoses. ^ Allow coolant in the core to drain into the pan. 4. Heater distributor duct (134) (figure 9). ^ Remove the screws that hold the distributor duct to the distributor case and the distributor duct to the engine cover. 5. Engine housing cover. Refer to Access Cover, Engine. See: Body and Frame 6. Instrument panel. See: Instrument Panel, Gauges and Warning Indicators 7. Lower the steering column. Refer to Steering Column. See: Steering and Suspension/Steering ^ Raise and support the right side of the instrument panel. 8. Defroster duct (130) to distributor case (124) attaching screws. 9. Distributor to heater case screws. 10. Temperature door cable (145) (figure 10). ^ Fold the cable back for access. 11. Heater case (124) and core (122). ^ Three nuts at the engine compartment side of the distributor case and one screw on the passenger side. ^ Tilt the case assembly rearward at the top while lifting up until the core tubes clear the dash openings. 12. Core retaining straps (123). 13. Core (122). Install or Connect (Figures 5 through 10 and Figure 20) 1. Core (122) to the heater case (124). ^ Apply a bead of permagum sealer between the core and the case. 2. Core retaining straps (123). 3. Heater case (124) to the vehcle. ^ Apply a bead of permagum sealer between the heater case and the opening in the vehicle. ^ Tilt the case until the core tubes clear the cowl opening. 4. 5. 6. 7. 8. 9. Temperature cable (145) to the heater case (124). Distributor duct (134) to the heater case (124). Defroster duct (130) to the heater case (124). Instrument panel. Steering column. Engine housing cover.

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1. On vehicles equipped with a manual transmission, remove the shift lever. 2. On vehicles equipped with an automatic transmission, perform the following steps: 2.1. Apply the park brake. 2.2. Insert the ignition key and turn the ignition switch to the RUN position. 2.3. Depress the brake pedal and shift the transmission to the 1 position. 2.4. Turn the ignition switch to the OFF position. CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices. 3. 4. 5. 6. 7. 8. 9. 10. Disconnect the battery negative cable. Remove the left sound insulator. Remove the right instrument panel sound insulator. If the vehicle is equipped with a multiple CD changer located in the center console, remove the center console. Remove the center sound insulator. Remove the lower left instrument panel mounting bolt. Remove and retain the instrument panel storage compartment. Remove the lower right instrument panel mounting bolt. 11. Remove and retain the left and right speakers and the speaker grilles. 12. Use a flat-bladed tool in order to remove the windshield defroster grille. Retain the grille and sunload sensor for use on the next IP carrier. 13. 14. 15. 16. If equipped with a sun load temperature sensor twist the sensor 1/4 turn counterclockwise in order to disengage. Disconnect the brown electrical connection from the body control module (BCM). Disconnect the purple electrical connection from the body control module (BCM). Remove the knee bolster. 1998 Chevy Truck S10/T10 Blazer 2WD V6-4.3L VIN W 17. Remove and retain the instrument cluster. 18. Remove and retain the radio. 19. Remove the HVAC control assembly. CAUTION: Refer to SIR Handling Caution in Cautions

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Tool Required: Lock Plate Compressor Important ^ Use only the specified screws, bolts and nuts at assembly. The use of over-length screws could prevent a portion of the assembly from compressing under impact. Feed the connector down through the housing and under the mounting bracket. Install the cover on the harness. 1. Turn signal switch and mounting screws. Clip the connector to the bracket on the jacket. 2. Instrument panel trim plate. 3. Hazard warning knob. 4. Turn signal lever and screws. Put the turn signal switch in the “Neutral” position. Pull out on the hazard warning knob. 5. Washer: upper bearing preload spring and cancelling cam onto the upper end of the shaft. 6. Lock plate onto the end of the shaft. Screw the center post of J-23653-B onto the steering shaft as far as it will go. Place a NEW retaining ring over the center post. Place the “C” bar over the center post and then compress the lock plate by turning the nut clockwise. Slide the new retaining ring down the tapered center post and into the shaft groove. Remove J 23653-B. 7. Cover on the lock plate and snap into position. 8. Steering wheel.