For a complete wiring diagram Refer to Section 8WThe Camshaft Position (CMP) Sensor is a hall effect type sensor. The sensor produces a 5–volt digital signal (square wave). The ECM provides a 5–volt supply, 5–volt sensor signal and ground to the CMP Sensor. The sensor is positioned opposite a toothed eccentric on the camshaft. As the camshaft rotates, the teeth on the eccentric pass closely to the CMP sensor triggering the hall-effect switch causing the digital switching of the sensor signal from high (5–volts) to low (0 volts).When Monitored:With the engine speed above 50 rpm.Set Condition:The Engine Control Module (ECM) does not receive a signal from the Camshaft Position Sensor when the Crankshaft Position Sensor indicates engine rpm.Possible Causes(K844) CMP 5-VOLT SUPPLY CIRCUIT OPEN(K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGECHECKING (K844) CMP 5-VOLT SUPPLY CIRCUITDAMAGED CMP SENSOR OR CAMSHAFTECM(K944) CMP SENSOR GROUND CIRCUIT OPENINTERMITTENT CONDITION(K44) CMP SENSOR SIGNAL CIRCUIT OPEN(K844) CMP 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND(K44) CMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUNDCAMSHAFT POSITION SENSOR(K844) CMP 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUIT(K44) CMP SENSOR SIGNAL CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUITAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. VERIFY ACTIVE DTCIf any Sensor Reference or Sensor Supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the Service Information to ensure the timing belt is properly installed.If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.Turn the ignition on.With the scan tool, erase the ECM DTCs.Attempt to start the engine cranking the engine for at least 7 seconds.With the scan tool, read the ECM DTCs.Does the scan tool display this DTC?YesGo To 3 NoGo To 22. TEST DRIVETurn the ignition on.With the scan tool, erase the ECM DTCs.Test drive the vehicle.With the scan tool, read the ECM DTCs.Does the scan tool display this DTC?YesGo To 3NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)3. CHECKING (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT

Turn the ignition off.Disconnect the Camshaft Position Sensor harness connector.Turn the ignition on.Measure the voltage of the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector.Select the appropriate voltage reading.Voltage is above 5.4 volts.Go To 4Voltage is between 4.7 and 5.4 volts.Go To 5Voltage is below 4.7 volts.Go To 124. (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE

Turn the ignition off.Disconnect the ECM harness connectors.Remove the ASD Relay.Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.Turn the ignition on.Measure the voltage of the (K44) CMP Position Sensor Signal circuit at the CMP Sensor harness connector.Is the voltage below 1.0 volt?YesReplace and program the Engine Control Module in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoRepair the (K44) Camshaft Position Sensor Signal circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. CHECKING (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT

Measure the voltage of the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector.Select the appropriate voltage reading.Voltage is above 5.4 volts.Repair the (K844) CMP 5-Volt Supply circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)Voltage is between 4.7 and 5.4 volts.Go To 6Voltage is below 4.7 volts.Go To 96. (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT OPEN

Turn the ignition on.Disconnect the ECT Sensor harness connector.Connect one end of a jumper wire to the ECT Sensor signal circuit in the ECT Sensor harness connector.Connect the other end of the jumper wire to the (K944) CMP Sensor Ground circuit in the Camshaft Position Sensor harness connector.With the scan tool in Engine, Sensors, read the Engine Coolant Temp volts.Is the voltage below 0.5 volt?YesGo To 8NoGo To 77. (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance of the (K944) CMP Sensor Ground circuit between the CMP Sensor harness connector and the ECM harness connector.Is the resistance below 10.0 ohms?YesReplace and program the ECM in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoRepair the (K944) CMP Sensor Ground circuit for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. DAMAGED CAMSHAFT POSITION SENSOR OR CAMSHAFTTurn the ignition off.Remove the CMP Sensor.Inspect the CMP Sensor for conditions such as loose mounting screws, damage, or cracks.Inspect the camshaft for conditions such as damage, debris or cracked teeth.Is there any evidence of these conditions?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Camshaft Position Sensor in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)9. (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance of the (K844) CMP 5-Volt Supply circuit between the ECM harness connector and the CMP Sensor harness connector.Is the resistance below 10.0 ohms?YesGo To 10NoRepair the (K844) CMP 5-Volt Supply circuit for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)10. (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector.Is the resistance above 1000 ohms?YesGo To 11NoRepair the (K844) CMP Sensor 5-Volt Supply circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)11. (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUIT

Measure the resistance between the (K844) CMP Sensor 5-Volt Supply circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector.Is the resistance above 1000 ohms?YesReplace and program the Engine Control Module in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoRepair the (K844) CMP Sensor 5-Volt Supply circuit and (K944) CMP Sensor Ground circuits for a short together.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)12. (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance of the (K44) CMP Sensor Signal circuit between the ECM harness connector and the CMP Sensor harness connector.Is the resistance below 10.0 ohms?YesGo To 13NoRepair the (K44) CMP Sensor Signal circuit for an openPerform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)13. (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector.Is the resistance above 1000 ohms?YesGo To 14NoRepair the (K44) CMP Sensor Signal circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)14. (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT

Measure the resistance between the (K44) CMP Sensor Signal circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector.Is the resistance above 1000 ohms?YesReplace and program the Engine Control Module in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoRepair the (K44) CMP Sensor Signal circuit and the (K944) CMP Sensor Ground circuit for a short together.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)