P0340

DTC P0340

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor

DTC P0340

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Camshaft Position Sensor Circuit

Diagnostic Fault Information






Circuit/System Description

The hall effect camshaft position sensor produces 3 ON/OFF pulses for each revolution of the camshaft. The camshaft position output is pulse width encoded. The engine control module (ECM) uses the camshaft position and crankshaft position output pulses to determine the engine speed and position. The camshaft position is connected directly to the ECM.

Conditions for Running the DTC

* The ignition is ON.

* The engine is turning faster than 50 RPM.

* DTC P0340 runs continuously when the above conditions are met.

* DTCs P0335, P0336 are not set.

Conditions for Setting the DTC

The ECM does not see a camshaft position sensor signal for more than 2 seconds.

Action Taken When the DTC Sets

DTC P0340 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P0340 is a Type A DTC.

Diagnostic Aids

If the camshaft position sensor signal is lost while running, the engine will operate normally.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Engine running, observe the DTC information with a scan tool. DTC P0340 should not set.

2. Engine idling, observe the scan tool Camshaft Position Active Counter parameters. The parameter should be incrementing.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the camshaft position sensor.

2. Ignition OFF and all vehicle systems OFF, it may take 2 minutes for all Vehicle systems to power down. Test for less than 5 ohms between low reference circuit terminal 2 of the connector and ground.

• If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 of the connector and ground.

• If less that the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 1 of the connector and ground.

• If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Ignition OFF, connect a 3-amp fused jumper wire between signal circuit terminal 1.

6. Ignition ON, momentarily touch the end of the fused jumper wire to ground while monitoring the scan tool camshaft position active counter. The camshaft position active counter should increment.

• If the camshaft position active counter does not increment, replace the K20 ECM.

7. If all circuits test normal, replace the B23 camshaft position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Camshaft Position Sensor Replacement Service and Repair

* Control Module References Control Module References for ECM replacement, setup, and programming