Auto Repair Manual Free Download and ReviewsFree download ebook pdf files automotive manual

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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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Tests/Procedures: Potential Causes: Tech Tips: 1. Unplug the Vehicle Speed Sensor (VSS) in the rear differential. 2. Check the voltage on the Pink/Orange wire in the VSS connector. The Body Control Module (BCM) sends B+ out to the sensor on the Pink/Orange wire at pin 21 in the C2 connector of the Body Control Module (BCM) . 3. Check the resistance of the Dark Green/Orange wire to ground. It should be 100- 300 ohms. The BCM has a resistor to ground to lower the current flow in the circuit. 4. If both wires are OK, replace the VSS. Body Control Module (BCM) Vehicle Speed Sensor (VSS) Wiring Vehicles with ABS get the VSS signal from the same sensor but the signal first goes to the Controller Anti-lock Brakes (CAB) and then to the Body Control Module (BCM) and then to the Powertrain Control Module (PCM). Confirmed Fix 2 2 2 1 – - – - Vehicle Speed Sensor (VSS) Connector Vehicle Speed Sensor (VSS) Wiring Wiring Rear Wheel Speed Sensor

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CONDITION POSSIBLE CAUSE CORRECTION Very High Frequency Excessive distance between Shim starter motor toward Flywheel/Drive Whine Before Engine pinion gear and Flywheel/Drive Plate. Starts; Engine Starts OK. Plate gear. Very High Frequency Insufficient distance between Shim starter motor away from Whine After Engine Starts starter motor pinion gear and Flywheel/Drive Plate. Inspect With Ignition Key Flywheel/ Drive Plate runout Flywheel/Drive Plate for damage; bent, Released. Engine Starts can cause noise to be unusual wear, and excessive runout. OK. intermittent. Replace Flywheel/Drive Plate as necessary. A Loud “Whoop” After Probable cause is defective Replace starter motor. Engine Starts While Starter overrunning clutch. Motor is Engaged “Rumble”, “Growl”, or Probable cause is bent or Replace starter motor. “Knock” as Starter Motor unbalanced starter motor Coasts to Stop After armature. Engine Starts.

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Customer Concern: Tests/Procedures: Potential Causes: Engine overheats down the road. It is OK at low speeds. If the heater is turned on high, the engine will run cooler. Tried flushing the cooling system and replaced the thermostat. 1. Remove the hoses from the radiator and connect a garden hose to one end to check the flow through it. Restricted Radiator Confirmed Fix 5 2 2 1 1 1 – - – - – - Radiator Radiator, Water Pump Water Pump Coolant, Thermostat Cooling System, Radiator, Thermostat Thermostat

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1. Disconnect vacuum hose at speed control servo and install a vacuum gauge into the disconnected hose. 2. Start engine and observe gauge at idle. Vacuum gauge should read at least ten inches of mercury. 3. If vacuum is less than ten inches of mercury, determine source of leak. Check vacuum line to engine for leaks. Also check actual engine intake manifold vacuum. If manifold vacuum does not meet this requirement, check for poor engine performance and repair as necessary. 4. If vacuum line to engine is not leaking, check for leak at vacuum reservoir. To locate and gain access to reservoir, refer to Vacuum Reservoir REMOVAL /INSTALLATION . Disconnect vacuum line at reservoir and connect a hand-operated vacuum pump to reservoir fitting. Apply vacuum. Reservoir vacuum should not bleed off. If vacuum is being lost, replace reservoir. 5. Verify operation of one-way check valve and check it for leaks. a. Locate one-way check valve. The valve is located in vacuum line between vacuum reservoir and engine vacuum source. Disconnect vacuum hoses (lines) at each end of valve. b. Connect a hand-operated vacuum pump to reservoir end of check valve. Apply vacuum. Vacuum should not bleed off. If vacuum is being lost, replace one-way check valve. c. Connect a hand-operated vacuum pump to vacuum source end of check valve. Apply vacuum. Vacuum should flow through valve. If vacuum is not flowing, replace one-way check valve. Seal the fitting at opposite end of valve with a finger and apply vacuum. If vacuum will not hold, diaphragm within check valve has ruptured. Replace valve.