P0340-CAMSHAFT POSITION SENSOR CIRCUITFor a complete wiring diagram Refer to Section 8W.When Monitored:During engine cranking and with the engine running. Battery voltage greater than 10 volts.Set Condition:At least 5 seconds or 2.5 engine revolutions have elapsed with crankshaft position sensor signals present but no camshaft position sensor signal. One Trip Fault. Three good trips to turn off the
MIL.
Possible Causes(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE(F856) 5-VOLT SUPPLY CIRCUIT OPEN(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE(K44) CMP SIGNAL CIRCUIT OPEN(K44) CMP SIGNAL CIRCUIT SHORTED GROUND(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT(K900) SENSOR GROUND CIRCUIT OPENCAMSHAFT POSITION SENSORCRANKSHAFT POSITION SENSORPCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).Diagnostic Test1.ACTIVE DTCCrank the engine.Ignition on, engine not running.With a scan tool, select View DTCs.Is the DTC Active at this time?YesGo To 2NoGo To 142.(F856) 5-VOLT SUPPLY CIRCUITTurn the ignition off.Disconnect the CMP Sensor harness connector.Ignition on, engine not running.Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.Is the voltage between 4.5 and 5.2 volts?YesGo To 3NoGo To 103.(K44) CMP SIGNAL CIRCUITMeasure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.Is the voltage between 4.5 and 5.0 volts?YesGo To 4NoGo To 74.(K900) SENSOR GROUND CIRCUIT OPENTurn the ignition off.Disconnect the C2 PCM harness connector.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 of the (K900) Sensor ground circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 5NoRepair the open in the (K900) Sensor ground circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5.(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUITMeasure the resistance between the (K44) CMP Signal circuit and the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.Is the resistance below 5.0 ohms?YesRepair the short between the (K44) CMP Signal circuit and the (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 66.CAMSHAFT POSITION SENSORInspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.If there are no possible causes remaining, view repair.RepairReplace the Camshaft Position Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7.(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGETurn the ignition off.Disconnect the C2 PCM harness connector.Ignition on, engine not running.Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (K44) CMP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 88.(K44) CMP SIGNAL CIRCUIT OPENTurn 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 of the (K44) CMP Signal circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 9NoRepair the open in the (K44) CMP Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)9.(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUNDMeasure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (K44) CMP Signal circuitPerform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 1010.(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGETurn the ignition off.Disconnect the C1 PCM harness connector.Ignition on, engine not running.Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 1111.(F856) 5-VOLT SUPPLY CIRCUIT OPENTurn 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 of the (F856) 5-volt Supply circuit between the CMP Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 12NoRepair the open in the (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)12.(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUNDMeasure the resistance between ground and the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 1313.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)14.ERRATIC CMP SIGNALWith a lab scope probe and the Miller special tool #6801, back probe the (K44) CMP Signal circuit in the CMP 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 the Camshaft Position Sensor.Observe the lab scope screen.Allow the engine to idle.Observe the lab scope screen.Did the CMP Sensor generate any erratic pulses?YesReplace the Camshaft Position Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 1515.ERRATIC CKP SIGNALTurn the ignition off.With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the CKP 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 Crankshaft Position Sensor.Observe the lab scope screen.Allow the engine to idle.Observe the lab scope screen.Did the CKP Sensor generate any erratic pulses?YesReplace the Crankshaft Position Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoTest complete, the conditions that set this DTC are not present at this time