For a complete wiring diagram Refer to Section 8WThe Crankshaft Position (CKP) 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 CKP Sensor. The sensor is positioned opposite a magnetic ring at the rear of the crankshaft. The magnetic ring contains internal magnetic strips (electric teeth) that act on 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 cranking or runningSet Condition:The Engine Control Module (ECM) does not receive a signal from the Crankshaft Position Sensor when the Camshaft Position Sensor indicates engine rpm.Possible Causes(K853) CKP SENSOR 5-VOLT SUPPLY CIRCUIT OPEN(K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGECHECKING (K853) CKP SENSOR 5-VOLT SUPPLY CIRCUITDAMAGED CKP SENSOR OR CRANKSHAFTECM(K925) CKP SENSOR GROUND CIRCUIT OPENINTERMITTENT CONDITION(K24) CKP SENSOR SIGNAL CIRCUIT OPEN(K853) CKP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND(K24) CKP SENSOR SIGNAL CIRCUIT SHORTED TO GROUNDCRANKSHAFT POSITION SENSOR(K925) CKP SENSOR GROUND CIRCUIT OPEN(K853) CKP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT(K24) CKP SENSOR SIGNAL CIRCUIT SHORTED TO THE (K925) CKP 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 (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT

Turn the ignition off.Disconnect the Crankshaft Position Sensor harness connector.Turn the ignition on.Measure the voltage of the (K24) CKP Sensor Signal circuit at the CKP 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. (K24) CRANKSHAFT 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 (K24) CKP Position Sensor Signal circuit at the CKP 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 (K24) Crankshaft Position Sensor Signal circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. CHECKING (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT

Measure the voltage of the (K853) CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector.Select the appropriate voltage reading.Voltage is above 5.4 volts.Repair the (K853) CKP 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. (K925) CRANKSHAFT POSITION SENSOR GROUND CIRCUIT OPEN

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 (K925) CKP Sensor Ground circuit in the Crankshaft 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. (K925) CRANKSHAFT POSITION SENSOR GROUND CIRCUIT OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance of the (K925) CKP Sensor Ground circuit between the CKP 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 (K925) CKP Sensor Ground circuit for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. DAMAGED CRANKSHAFT POSITION SENSOR OR CRANKSHAFTTurn the ignition off.Remove the CKP Sensor.Inspect the CKP Sensor for conditions such as loose mounting screws, damage, or cracks.Inspect the Crankshaft magnetic ring for conditions such as damage, or debris.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 Crankshaft Position Sensor in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)9. (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance of the (K853) CKP Sensor 5-Volt Supply circuit between the ECM harness connector and the CKP Sensor harness connector.Is the resistance below 10.0 ohms?YesGo To 10NoRepair the (K853) CKP Sensor 5-Volt Supply circuit for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)10. (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K853) CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector.Is the resistance above 1000 ohms?YesGo To 11NoRepair the (K853) CKP Sensor 5-Volt Supply circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)11. (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT

Measure the resistance between the (K853) CKP Sensor 5-Volt Supply circuit and the (K925) CKP Sensor Ground circuit at the CKP 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 (K853) CKP Sensor 5-Volt Supply circuit and (K925) CKP Sensor Ground circuits for a short together.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)12. (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance of the (K24) CKP Sensor Signal circuit between the ECM harness connector and the CKP Sensor harness connector.Is the resistance below 10.0 ohms?YesGo To 13NoRepair the (K24) CKP Sensor Signal circuit for an openPerform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)13. (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector.Is the resistance above 1000 ohms?YesGo To 14NoRepair the (K24) CKP Sensor Signal circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)14. (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT

Measure the resistance between the (K24) CKP Sensor Signal circuit and the (K925) CKP Sensor Ground circuit at the CKP 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 (K24) CKP Sensor Signal circuit and the (K925) CKP Sensor Ground circuit for a short together.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)