Description & Operation
The Powertrain Control Module (PCM) sends approximately 5 volts to the Hall-effect sensor. This voltage is required to operate the Hall-effect chip and the electronics inside the sensor. The input to the PCM occurs on a 5 volt output reference circuit. A ground for the sensor is provided through the sensor return circuit. The PCM identifies camshaft position by registering the change from 5 to 0 volts, as signaled from the camshaft position sensor.
The PCM determines fuel injection synchronization and cylinder identification from inputs provided by the camshaft position sensor and crankshaft position sensor. From the two inputs, the PCM determines crankshaft position.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
- Remove the air cleaner lid, disconnect the inlet air temperature sensor and makeup air hose.
- Remove the negative battery cable.
- Disconnect the electrical connector from the Camshaft Position (CMP).
- Remove CMP mounting screws.
- Remove the CMP sensor.
- Loosen screw attaching target magnet to the rear of camshaft.
The target magnet has locating dowels that fit into machined locating holes in the end of the camshaft.
Install the target magnet in the end of the camshaft. Tighten mounting screw to 35 inch lbs. (4 Nm) torque.
- Install the CMP sensor. Tighten the CMP sensor mounting screws to 80 inch lbs. (9 Nm) torque.
- Carefully attach the electrical connector to CMP sensor. Installation at an angle may damage the sensor pins.
- Install the negative battery cable.
- Install the air cleaner lid, connect the inlet air temperature sensor and makeup air hose.
- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Camshaft Position Sensor and the Powertrain Control Module (PCM).
- Look for any chafed, pierced, pinched, or partially broken wires.
- Look for broken, bent, pushed out, or corroded terminals.
- Inspect the Camshaft Position Sensor for conditions such as loose mounting screws, damage, or cracks.
- If no other problems are found, remove the Camshaft Position Sensor.
- Inspect the Camshaft Position Sensor and mounting area for any condition that would result in an incorrect signal, such as damage, foreign material, or excessive movement.
- Using a diagnostic scan tool, check for the presence of any Diagnostic Trouble Codes (DTC-s). Record and address these codes as necessary.
- If no codes are present, review the scan tool environmental data. If possible, try to duplicate the conditions under which the DTC set.
- If applicable, actuate the component with the scan tool.
- Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
- Look for the data to change, the actuation to be interrupted, or for the DTC to reset during the wiggle test.
- Refer to any Technical Service Bulletins (TSB's) that may apply.
- Turn the ignition off.
- Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
- Perform a voltage drop test on the related circuits between the suspected component and the Powertrain Control Module (PCM).
- Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
- If numerous trouble codes were set, use a schematic and inspect any common ground or supply circuits.
- For intermittent Misfire DTC-s check for restrictions in the Intake and Exhaust system, proper installation of Sensors, vacuum leaks, and binding components that are run by the accessory drive belt.
- Use the scan tool to perform a System Test if one applies to the component.
- A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.