P0340-CAMSHAFT POSITION SENSOR CIRCUIT

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the engine cranking or running. Engine speed above 50 rpm. No Sensor Supply DTC's present.
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 VOLTAGE

(K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

CHECKING (K844) CMP 5-VOLT SUPPLY CIRCUIT

DAMAGED CMP SENSOR OR CAMSHAFT

ECM

(K944) CMP SENSOR GROUND CIRCUIT OPEN

INTERMITTENT CONDITION

(K44) CMP SENSOR SIGNAL CIRCUIT OPEN

(K844) CMP 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

(K44) CMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

CAMSHAFT 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 CIRCUIT

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test

1. VERIFY ACTIVE DTC

NOTE: If DTC P0642 or P0643 is present with this DTC, diagnose DTCs P0642 or P0643 before diagnosing this DTC.

NOTE: 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.

NOTE: 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.

NOTE: 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?

Yes

Go To 3

Go To 2

2. TEST DRIVE

Turn 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?

Yes

Go To 3

Refer 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 4

Voltage is between 4.7 and 5.4 volts.

Go To 5

Voltage is below 4.7 volts.

Go To 12

4. (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE

Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the Main Relay.
Connect a jumper wire between cavity B7 and cavity B9 of the Main Relay connector.
Turn the ignition on.
Measure the voltage of the (K44) CMP Position Sensor Signal circuit at the CMP Sensor harness connector.
Measure the voltage of the (K944) CMP Position Sensor Ground circuit at the CMP Sensor harness connector.

Is the voltage below 1.0 volt for each measurement?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Repair the CKP Sensor circuit(s) that measured above 1.0 volt for a short to voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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 - DIAGNOSIS AND TESTING)

Voltage is between 4.7 and 5.4 volts.

Go To 6

Voltage is below 4.7 volts.

Go To 9

6. (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 (K2) 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?

Yes

Go To 8

Go To 7

7. (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT OPEN

Turn the ignition off.
Disconnect the CMP Sensor harness connector.
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?

Yes

Replace and program the ECM in accordance with the Service Information.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Repair the (K944) CMP Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

8. DAMAGED CAMSHAFT POSITION SENSOR OR CAMSHAFT

Turn 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?

Yes

Repair as necessary.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Replace the Camshaft Position Sensor in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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?

Yes

Go To 10

Repair the (K844) CMP 5-Volt Supply circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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?

Yes

Go To 11

Repair the (K844) CMP Sensor 5-Volt Supply circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Repair 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 - DIAGNOSIS AND TESTING)

12. (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT OPEN

Turn the ignition off.
Disconnect the CMP Sensor harness connector.
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?

Yes

Go To 13

Repair the (K44) CMP Sensor Signal circuit for an open
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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?

Yes

Go To 14

Repair the (K44) CMP Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Repair 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 - DIAGNOSIS AND TESTING)