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Inspection and Verification 1. Verify the customer’s concern by operating the climate control system to duplicate the condition. 2. Inspect to determine if one of the following mechanical or electrical concerns apply: Visual Inspection Chart Loose, missing or damaged A/C compressor drive belt. Loose or disconnected A/C clutch. Loose, misrouted or damaged vacuum lines. Broken or leaking vacuum control motora Discharged A/C system. Broken or leaking refrigerant lines. a a A leak in the vacuum control circuit may occur during acceleration (slow leak), may exist at all times (large leak), and may exist only when specific functions are selected (indicating a leak in that portion of the circuit). The vacuum hoses used in the passenger compartment control circuit are constructed from PVC plastic material. The vacuum hoses used in the engine compartment are constructed of Hytrel®. Because of the materials used, never pinch the vacuum hoses off during diagnosis to locate a leak. A wood golf tee can be used as a plug when it is necessary to plug one end of the vacuum hose for leak test purposes. 3. If the inspection reveals obvious concern(s) that can be readily identified, service as required. 4. If equipped with the electronic automatic temperature control system, go to Step 6. 5. If equipped with a manual A/C system, determine the symptom and go to the Symptom Chart. 6. If the concern remains after the inspection, connect the Rotunda New Generation Star (NGS) Tester to the data link connector (DLC) located beneath the instrument panel to carry out the DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the electronic automatic temperature control module, GO to Pinpoint Test A. If the DATA LINK DIAGNOSTICS test is passed for the electronic automatic temperature control module, retrieve the continuous DTCs and execute the Self-Test Diagnostics for the electronic automatic temperature control module to retrieve the current DTCs. Mechanical Electrical Open fuses. Blower motor inoperative. A/C compressor inoperative. Circuitry open/shorted. Disconnected electrical connectors. 7. If the self-test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. 8. If DTCs are retrieved, go to the Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. 9. If the electronic automatic temperature control module cannot be accessed by the NGS, GO to Pinpoint Test A. Electronic Automatic Temperature Control Module Self-Test The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A NGS tester must be used to retrieve these concerns. The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTCs) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4-32° (40-90°F) when performing the self-test. If the temperatures are C not within the specified ranges, false in-car temperature sensor DTCs will be displayed. The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated. To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed. If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given. If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation. To exit self-test and retain all intermittent DTCs, push the blue (cooler temperature) button. The control will exit self-test, retain all intermittent DTCs and then turn OFF (display blank). To exit self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared. Always exit the self-test before powering the system down (system turned OFF). Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.

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The Camshaft Position Sensor (CMP) on the 4.0L 6cylinder engine is bolted to the top of the oil pump drive shaft assembly. The sensor and drive shaft assembly is located on the right side of the engine near the oil filter. The rotational position of oil pump drive determines fuel synchronization only. It does not determine ignition timing. WARNING Do NOT attempt to rotate the oil pump drive to modify ignition timing. 1. Two different procedures are used for Removal & Installation. The first procedure will detail Removal & Installation of the sensor only. The second procedure will detail Removal & Installation of the sensor and oil pump drive shaft assembly. The second procedure is to be used if the engine has been disassembled. 2. An internal oil seal is used in the drive shaft housing that prevents engine oil at the bottom of the sensor. The seal is not serviceable. Sensor Only 1. Disconnect electrical connector at CMP sensor. 2. Remove 2 sensor mounting bolts. 3. Remove sensor from oil pump drive. Oil Pump Drive & Sensor WARNING If the CMP and oil pump drive are to be removed and installed, do NOT allow engine crankshaft or camshaft to rotate. CMP sensor relationship will be lost. Disconnect electrical connector at CMP sensor. Remove 2 sensor mounting bolts Remove sensor from oil pump drive. Before proceeding to next step, mark and note rotational position of oil pump drive in relationship to engine block. After installation:, the CMP sensor should face rear of engine 0. 5. Remove hold-down bolt and clamp. 6. While pulling assembly from engine, note direction and position of pulse ring. After Removal & Installation, look down into top of oil pump and note direction and position of slot at top of oil pump gear. 7. Remove and discard old oil pump drive-to-engine block gasket. 1. 2. 3. 4. Sensor Only The Camshaft Position Sensor (CMP) on the 4.0L 6cylinder engine is bolted to the top of the oil pump drive shaft assembly. The sensor and drive shaft assembly is located on the right side of the engine near the oil filter. 1. Install sensor to oil pump drive. 2. Install 2 sensor mounting bolts and tighten to 2 Nm (15 inch lbs.) torque. 3. Connect electrical connector to CMP sensor. Oil Pump Drive & Sensor 1. Clean oil pump drive mounting hole area of engine block. 2. Install new oil pump drive-to-engine block gasket.

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1. Open the rear liftgate.2. Remove the two screws that attach both the left and right tail lamp assemblies and remove the lamps from the body. 3. Inspect the part number on both the left and right tail lamp circuit boards. Chevrolet – New P/N 16532713 Chevrolet Export – New P/N 16532714 Buick and Oldsmobile – New P/N 16532715 GMC – New P/N 16532716 • If the part number printed on a circuit boards IS one of the part number listed above, then the circuit board is the new design and does NOT need to be replaced. • If the part number printed on a circuit board is NOT one of the part numbers listed above, then the circuit boards is the old design and MUST BE REPLACED. Proceed to the next step if either circuit board needs to be replaced. 4. Turn on the tail lamps, directional signals, etc. and determine if there are any bulbs that require replacement. 5. Disconnect the electrical connector from the circuit board being replaced. 6. Remove the three screws attaching the circuit board to the tail lamp and remove the circuit board. 7. Install a NEW stop lamp bulb in a NEW circuit board. • On Chevrolet, Buick and Oldsmobile vehicles, the stop lamp bulb is located in the UPPER (top) socket in the circuit boards. • On GMC vehicles, the stop lamp bulb is located in the LOWER (bottom) socket in the circuit board. Important: This special policy will cover the cost of replacing the stop lamp bulb(s). All other bulbs that require replacement are to be submitted under the normal warranty operation, if applicable. 8. Transfer the remaining bulbs from the old circuit board to the new circuit board. Replace any burned out bulbs. 9. Connect the electrical connector to the new circuit board(s). 10. Turn on the tail lamps, directional signals, etc. and verify that all bulbs are functional. 11. Install the circuit board to the tail lamp and install the three screws.

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When ignition switch is in the ON or START position, the PCM connects FUEL PUMP circuit (PCM terminal No. 22) to ground. The fuel pump relay is energized and electrical current flows to the fuel pump. If PCM does not receive ignition PIP signal within 2 seconds, FUEL PUMP circuit is opened and fuel pump operation is terminated. Perform this test when instructed by QUICK TEST or CIRCUIT TEST AA. This test is only intended to diagnose: Fuel pump relay. Inertia Fuel Shutoff (IFS) switch. Wiring harness circuits (B+, VPWR, FUEL PUMP, GND and POWER-TO-PUMP). Faulty Powertrain Control Module (PCM). .

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Includes: R&R Trans Pan, Service Filter And Make All Necessary Adjustments. Diagnose/Test AX4N/4F50N Oil Leak, Diagnosis Includes: Clean And Dry Outside Of Case And Operating Unit To Determine Point Of Leakage. Transaxle, Diagnosis Includes: Time To Hook-Up And Disconnect Test Equipment. Checking System For Fault Codes, Road Test And Hydraulic Pressure Test As Required. AXOD-E, AX4S Oil Leak, Diagnosis Includes: Clean And Dry Outside Of Case And Operating Unit To Determine Point Of Leakage. Transaxle, Diagnosis Includes: Time To Hook-Up And Disconnect Test Equipment. Checking System For Fault Codes, Road Test And Hydraulic Pressure Test As Required. Replace AX4N/4F50N Complete Assembly Without Transfer Of Parts