For a complete wiring diagram Refer to Section 8W.When Monitored:While cranking the engine and with the engine running.Set Condition:When the CKP Sensor failure counter reaches 20. One Trip Fault. Three good trips to turn off the MIL.Possible Causes(F855) 5-VOLT SUPPLY CIRCUIT OPEN(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND(K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE(K24) CKP SIGNAL CIRCUIT OPEN(K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND(K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUITCRANKSHAFT POSITION SENSORTONE WHEEL/PULSE RINGPCMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. ACTIVE DTCIgnition on, engine not running.With a scan tool, select View DTCs.Is the DTC active at this time?YesGo To 2 NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPETurn the ignition off.With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the Sensor harness connector.When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Ignition on, engine not running.Observe the lab scope screen.Start the engine.Observe the lab scope screen.Are there any irregular or missing signals?YesGo To 3NoGo To 83. WIRE HARNESS INSPECTIONTurn the ignition off.Visually inspect the related wire harness including the ground circuit. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to the proper specification.Refer to any TSBs that may apply.Were any of the above conditions present?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44. (F855) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND

Disconnect the CKP Sensor connector.Ignition on, engine not running.Measure the voltage on the (F855) 5-volt Supply circuit in the Sensor harness connector.Is the voltage between 4.5 and 5.2 volts?YesGo To 5NoRepair the open or short to ground in the (F855) 5-volt Supply circuit. Use Miller special tool #8815 when checking for an open circuit to prevent PCM harness connector terminal damage.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. TONE WHEEL/FLEX PLATE INSPECTIONTurn the ignition off.Carefully disconnect the Negative Battery (Ground) cable.Remove the Crankshaft Position Sensor.Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.Were any problems found?YesRepair or replace the Tone Wheel/Flex Plate as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 66. CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPEInstall the CKP Sensor and connect the battery cable.An intermittent condition in the Cam Position Sensor can cause the P0339 to set.With the a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the Sensor harness connector.When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Ignition on, engine not running.Wiggle the related wire harness and lightly tap on the Cam Position Sensor.Observe the lab scope screen.Start the engine.Observe the lab scope screen.Are there any irregular or missing signals?YesReplace the Cam Position Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 77. CRANKSHAFT POSITION SENSORIf there are no possible causes remaining, view repair.RepairReplace the Crankshaft Position Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 8. (K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.Disconnect the C2 PCM harness connector.Disconnect the CKP Sensor harness connector.Ignition on, engine not running.Measure the voltage on the (K24) CKP Signal circuit in the Sensor harness connector.Wiggle the related wire harness while taking this measurement.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (K24) CKP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 99. (K24) CKP SIGNAL CIRCUIT OPEN

Turn the ignition off.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.Measure the resistance in the (K24) CKP Signal circuit from the CKP harness connector to the appropriate terminal of special tool #8815.Wiggle the wire harness while taking this measurement.Is the resistance below 1.0 ohm?YesGo To 10NoRepair the excessive resistance in the (K24) CKP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 10. (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K24) CKP Signal circuit in the CKP Sensor harness connector.Wiggle the related wire harness while monitoring the resistance value.Does the resistance ever drop below 100 ohms?YesRepair the short to ground in the (K24) Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 1111. (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Measure the resistance between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit in the CKP harness connector.Wiggle the related wire harness while taking this measurement.Is the resistance below 5.0 ohms?YesRepair the short between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 12 12. PCMBefore continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)