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Removal Drain the differential lubricant. See LUBRICATION . Disconnect the clutch pump check valve electrical connector. Remove the clutch pump check valve mounting bolts. See Fig. 1 . Remove the clutch pump check valve by carefully pulling straight out of the differential carrier. Remove the “O” ring seals from the valve. The “O” ring seals may be reused if not cut or damaged. If reinstalling original valve, inspect for damaged, loose, or missing pick up screen, damaged or missing “O” rings, damaged electrical connector, or oil passages restricted by dirt or debris. Installation NOTE: Inspect the clutch pump check valve “O” ring seals to ensure they are not cut or damaged. Replace cut or damaged “O” ring seals with NEW seals. 1. Lubricate the “O” ring seals with Synthetic Gear Oil (12378514 for United States or 88901045 for Canada) or equivalent. Install the “O” ring seals to the valve. Install the clutch pump check valve to the differential carrier by carefully pushing the valve straight in until fully seated. 2. Install the clutch pump check valve mounting bolts. See Fig. 1 . Tighten the bolts to specification. See TORQUE SPECIFICATIONS . Connect the clutch pump check valve electrical connector. Inspect differential fluid level. See LUBRICATION . Fill differential as necessary.

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2002-2004 Buick Rendezvous; 2001-2004 Chevrolet Venture (regular wheelbase), and Pontiac Aztek and Montana (regular wheelbase) vehicles. Variations in the manufacturing process or exposure to high temperatures may lead to a fracture of the fuel tank inlet check valve (ICV) on some of these vehicles. A fracture may allow fuel vapors to pass through and allow droplets of fuel to accumulate on the side of the fuel tank. SERVICE PROCEDURE 1. Remove the fuel tank from the vehicle. Refer to Fuel Tank Replacement in SI. 2. Install the new fuel tank. Refer to Fuel Tank Replacement in SI.

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Conditions for Running the All-Wheel Drive (AWD) Disable Fault • The system voltage is 9-18 volts. • The engine speed is greater than 500 RPM for 5 seconds, and the engine is not in fuel shut-off. • The rear drive module must not be in an overtemperature condition. Conditions for Turning On the All-Wheel Drive (AWD) Disable Lamp The AWD disable lamp illuminates when one of the following conditions exists for 5 seconds: • The PCM commands the solenoid ON and the voltage feedback remains high, B+. • The PCM commands the solenoid OFF and the voltage feedback remains low, 0 volts. This condition is present for 3 key cycles. Action Taken When the All-Wheel Drive (AWD) Lamp Illuminates • The PCM does not illuminate the malfunction indicator lamp (MIL). • The PCM inhibits AWD. • The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records. • The PCM stores the AWD disable fault in PCM history. Conditions for Clearing the All-Wheel Drive (AWD) Disable Fault • A scan tool can clear the fault. • The PCM clears the fault from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. • The PCM cancels the fault default actions when the fault no longer exists.

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IMPORTANT: When replacing a theft deterrent control module with an GM Service Parts Operation (SPO) Replacement Part, set up the control module prior to the 10-minute relearn procedure or the 30-minute relearn procedure. TOOLS REQUIRED Scan tool SET UP A NEW THEFT DETERRENT CONTROL MODULE Use this procedure only if replacing the theft deterrent control module with an GM SPO Replacement Part. 1. Connect a scan tool to the vehicle. 2. Turn ON the ignition, with the engine OFF. 3. With a scan tool, select Setup New VTD Module in the Vehicle Theft Deterrent, Special Functions data list. 4. Follow the scan tool on-screen instructions. IMPORTANT: When replacing a theft deterrent control module with an GM SPO Replacement Part, the module will learn the keys immediately. The existing powertrain control module (PCM) must learn the new fuel continue password when you replace the theft deterrent control module. When replacing a PCM with a GM SPO Replacement Part, the new PCM will learn the incoming fuel continue password immediately after programming and upon receipt of a password message. Once a password message is received and a password is learned, perform the learn procedure to change this password again. A PCM which had been installed in another vehicle will have learned the fuel continue password of the other vehicle’s theft deterrent control module. Perform either the 10-minute relearn procedure or the 30-minute relearn procedure after programming to learn the fuel continue password of the current vehicle’s theft deterrent control modules. When performing either relearn procedure, all previously learned keys will be erased from the theft deterrent control module’s memory. Additional keys may be learned immediately after the first relearn

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Draining Procedure Important: Do NOT add any engine coolant supplement sealant pellets to the cooling system. Drain and refill the engine cooling system every 5 years or 240 000 km, (150,000 ml) , whichever occurs first. 1. Park the vehicle on a level surface. 2. Remove and clean the coolant recovery reservoir. Caution: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap its removed while the engine and radiator are still hot. 3. Remove the radiator cap when the engine is cool: 3.1. Slowly rotate the cap counterclockwise to the detention tab. Do not press down while rotating pressure cap. 3.2. Wait until any residual pressure, indicated by a hissing sound, is relieved. 3.3. After all hissing stops, press down on the radiator cap and rotate the cap counterclockwise in order to remove the cap. Important: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do NOT pour used coolant down the drain. Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound. 4. Place a drain pan under the radiator drain cock in order to collect all of the used coolant. 5. Open the radiator drain cock. If only partial cooling system draining is required, drain enough coolant to perform the procedure.