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1. Raise and support the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel. 3. Remove the brake rotor (2). Refer to Brake Rotor Replacement – Front. 4. Important: The wheel speed sensor mounts to the hub/bearing assembly. Thoroughly clean around this area in order to prevent any dirt or contaminants from entering the sealed wheel bearing. Failure to do this may lead to premature wheel bearing failure. Remove the Wheel Speed Sensor (WSS) mounting bolt. 5. NOTICE: Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore. Remove the wheel speed sensor (5) from the hub/bearing assembly (4). Remove the WSS cable mounting clip from the knuckle. Remove the WSS cable mounting clip from the upper control arm. Remove the WSS cable mounting clip from the frame attachment point. Remove the WSS cable electrical connector. 6. 7. 8. 9. Installation Procedure 1. Plug the WSS bore to prevent debris from falling into the hub. 2. Using a wire brush or equivalent, clean the WSS mounting surface on the hub to remove any rust or corrosion. 3. Apply a thin layer of wheel bearing lubricant, GM P/N 01051344 to the hub surface and the sensor O-ring prior to the sensor installation.

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1. Disconnect battery ground cable (14301) . 2. Disconnect fuel charging wiring (9D930) from distributor stator (12A112) (camshaft position sensor). 3. Remove stator camshaft position sensor retaining screws and distributor stator (camshaft position sensor) from camshaft position sensor housing. 4. If removing camshaft position sensor housing from the engine front cover (6019) , proceed with Removal Step 5. If camshaft position sensor housing is not being removed, proceed to Installation Step 6. 5. CAUTION: Before proceeding with this procedure, set cylinder No. 1 to 26 degrees After Top Dead Center (ATDC) of the compression stroke. Then note the position of the stator (camshaft position sensor) electrical connector. The installation procedure requires that the connector be located in the same position. Remove retaining bolt and hold-down clamp (12270) . 6. NOTE: The oil pump intermediate shaft (6A618) should be removed with the camshaft position sensor housing. Remove camshaft position sensor housing from engine front cover . Installation 1. CAUTION: If the replacement distributor stator (camshaft position sensor) does not contain a plastic locator cover tool, a special service tool such as Syncro Positioning Tool T89P-12200-A must be obtained prior to installation of the replacement distributor stator (camshaft position sensor). Failure to follow this procedure will result in improper stator (camshaft position sensor) alignment. This will result in the fuel system being out of time with the engine, possibly causing engine damage. If the plastic locator cover tool is not attached to the replacement distributor stator (camshaft position sensor), attach Syncro Positioning Tool T89P-12200-A as follows: a. Engage camshaft position sensor housing vane into the radial slot of the tool. b. Rotate tool on camshaft position sensor housing until tool boss engages notch in camshaft position sensor housing. The cover tool should be square and in contact with entire top surface of camshaft position sensor housing. 2. Transfer oil pump intermediate shaft from old camshaft position sensor housing to replacement camshaft position sensor housing. 3. CAUTION: If stator (camshaft position sensor) electrical connector is not positioned properly (for example, contacting the A/C compressor bracket), DO NOT reposition the connector by rotating the camshaft position sensor housing. This will result in the fuel system being out of time with the engine, possibly causing engine damage. Remove the camshaft position sensor housing and repeat installation procedure, beginning with Step 1. Install camshaft position sensor housing so that drive gear engagement occurs when arrow on locator tool is pointed approximately 30 degrees counterclockwise from the front face of the cylinder block (6010) . This step will locate stator (camshaft position sensor) electrical connector in the pre-removal position. 4. Install hold-down clamp and retaining bolt and tighten bolt to 20-30 Nm (15-22 lb-ft). 5. Remove Syncro Positioning Tool T89P-12200-A. 6. CAUTION: If stator (camshaft position sensor) electrical connector is not positioned properly (for example, contacting the A/C compressor bracket), DO NOT reposition the connector by rotating the camshaft position sensor housing. This will result in the fuel system being out of time with the engine, possibly causing engine damage. Remove the camshaft position sensor housing and repeat installation procedure, beginning with Step 1. Install distributor stator (camshaft position sensor) and retaining screws. Tighten screws to 2.5-3.5 Nm (22-31 lb-in). 7. Connect fuel charging wiring connector to distributor stator (camshaft position sensor). 8. Connect battery ground cable .

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CAUTION: Prior to removal of the camshaft position sensor (CMP sensor) (12126) , set cylinder No.1 to zero degrees top dead center (TDC) of compression stroke. Then note the position of the camshaft position sensor electrical connector. The installation procedure requires the connector be located in the same position. Removal 1. Disconnect battery ground cable (14301). Refer to Section 14-01. 2. Disconnect fuel charging wiring connector from camshaft position sensor. 3. Remove camshaft position sensor retaining screws and camshaft position sensor from camshaft position sensor housing. 4. If removing camshaft position sensor housing from the cylinder block (6010), proceed with Removal Step 5. If not removing camshaft position sensor housing, proceed to Step 6 of the installation procedures. 5. Remove hold-down clamp (12270) (bolt and washer assembly). 6. NOTE: Remove the oil pump intermediate shaft (6A618) with the camshaft position sensor housing. Remove camshaft position sensor housing from cylinder block. Installation 1. CAUTION: If the replacement camshaft position sensor housing does not contain a plastic locator cover tool, a special service tool must be obtained prior to installation of the replacement camshaft position sensor. Failure to follow this procedure will result in improper camshaft position sensor alignment. This will result in the ignition fuel system being out of time with the engine, possibly causing engine damage. NOTE: For 3.0L engines, use Syncro Positioning Tool 303-589. For 3.8L engines, use Syncro Positioning Tool 303-562 (T96T-12200-A). If the plastic locator cover tool is not attached to the replacement camshaft position sensor housing, attach syncro positioning tool as follows: a. Engage camshaft position sensor housing vane into the radial slot of the tool. b. Rotate tool on camshaft position sensor housing until tool boss engages notch in camshaft position sensor housing. 2. Transfer oil pump intermediate shaft from old camshaft position sensor housing to replacement camshaft position sensor housing. 3. Install camshaft position sensor housing so drive gear engagement occurs when arrow on syncro positioning tool is pointed approximately as shown in the illustrations. This step will locate camshaft position sensor electrical connector in the pre-removal position. 4. Install hold-down clamp (washer and bolt assembly) and tighten bolt to 20-30 Nm (15-22 lb-ft). 5. Remove syncro positioning tool. 6. CAUTION: If camshaft position sensor electrical connector is not positioned properly, DO NOT reposition the connector by rotating the camshaft position sensor housing. This will result in the fuel system being out of time with the engine, possibly causing engine damage. Remove the camshaft position sensor housing and repeat installation procedure, beginning with Step 1. Install camshaft position sensor and retaining screws. On 3.0L engine, tighten screws to 2.5-3.5 Nm (23-30 lb-in). On 3.8L engine, tighten screws to 4.5-7 Nm (40-61 lb-in). 7. Connect fuel charging wiring connector to camshaft position sensor. 8. Connect battery ground cable. Refer to Section 14-01. Camshaft Position Sensor—3.0L Engine

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Generic Scan Tool Code (1) DRBIII(R) Scan Tool Message P0031 O2 SENSOR HEATER CIRCUIT LOW 1/1 P0032 O2 SENSOR HEATER CIRCUIT HIGH 1/1 P0051 O2 SENSOR HEATER CIRCUIT LOW 2/1 P0052 O2 SENSOR HEATER CIRCUIT HIGH 2/1 P0071 AMBIENT TEMP SENSOR PERFORMANCE P0107 MAP SENSOR VOLTAGE TOO LOW P0108 MAP SENSOR VOLTAGE TOO HIGH P0112 INTAKE AIR TEMP SENSOR VOLTAGE LOW P0113 INTAKE AIR TEMP SENSOR VOLTAGE HIGH P0117 ECT SENSOR VOLTAGE TOO LOW P0118 ECT SENSOR VOLTAGE TOO HIGH P0121 TPS VOLTAGE DOES NOT AGREE WITH MAP P0122 THROTTLE POSITION SENSOR VOLTAGE LOW P0123 THROTTLE POSITION SENSOR VOLTAGE HIGH

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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.