Diagnostic Instructions

DTC Descriptors

DTC P0016 5A: Camshaft Position (CMP) Sensor Circuit Plausibility Failure

DTC P0340 28: Camshaft Position (CMP) Sensor Circuit Incorrect Frequency

DTC P0340 29: Camshaft Position (CMP) Sensor Circuit Too Few Pulses

DTC P0341: Camshaft Position (CMP) Sensor Circuit

Circuit/System Description

The camshaft position (CMP) sensor correlates the crankshaft to camshaft position so that the engine control module (ECM) can determine which cylinder is ready to be fueled by an injector. As the camshaft rotates, the reluctor wheel interrupts a magnetic field produced by a magnet within the sensor and sends a signal to the ECM through the signal circuit.

Conditions for Running the DTC

P0016

P0340 and P0341

Conditions for Setting the DTC

P0016

The ECM detects an incorrect CMP signal.

P0340

The ECM detects too few CMP pulses.

P0341

The ECM detects no CMP signal.

Action Taken When the DTC Sets

DTCs P0016, P0340, and P0341 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0016, P0340, and P0341 are Type B DTCs.

Diagnostic Aids

The following conditions can also set the DTC:

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine running, observe the DTC information with a scan tool. DTCs P0016, P0340, and P0341 should not set.
2. 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, and the MAIN fuse removed, disconnect the harness connector at the CMP sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

3. Install the MAIN fuse. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 3 and ground.

⇒	If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.

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

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. 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. If all circuits test normal, test or replace the CMP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.