P0016

DTC P0016 or P0340

Diagnostic Instructions

* Perform the diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P0016
- Camshaft Position (CMP) Sensor Performance

DTC P0340
- Camshaft Position (CMP) Sensor Circuit

Diagnostic Fault Information






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. The CMP sensor circuits are directly connected to the ECM. The CMP sensor also determines which cylinder is misfiring. The CMP sensor circuits consist of the following:

* An ignition 1 voltage
* A low reference
* A CMP signal

Conditions for Running the DTC

* DTCs P0335 and P0336 are not set.
* The engine is running.
* The DTCs run continuously once the above conditions are met.

Conditions for Setting the DTC

P0016
The ECM detects an incorrect CMP signal for greater than 10 crankshaft revolutions.

P0340
The ECM detects no CMP signal for greater than 1 second.

Action Taken When the DTC Sets
DTCs P0016 and P0340 are Type A DTCs.

Conditions for Clearing the DTC
DTCs P0016 and P0340 are Type A DTCs.

Diagnostic Aids

The following conditions can also set the DTC:

* Physical damage to the CMP sensor or the reluctor wheel
* Excessive play or looseness of the CMP sensor or the reluctor wheel
* Improper installation of the CMP sensor or the reluctor wheel
* Foreign material passing between the CMP sensor and the reluctor wheel
* Excessive air gap between the CMP sensor and the reluctor wheel

Circuit/System Verification

1. Start the engine, observe the DTC information with a scan tool. DTCs P0016 and P0340 should not set.
2. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the CMP sensor.
2. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit 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.

3. Connect a test lamp between the ground circuit and the ignition 1 voltage circuit. Verify the test lamp illuminates.

• If the test lamp does not illuminate, repair the open/high resistance on the ground circuit.

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

• If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.

• If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.

5. If all circuits/connections test normal, replace the CMP sensor.

Repair Instructions

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

* Camshaft Position Sensor Replacement
* Programming and Relearning for ECM setup, and programming Programming and Relearning