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:

P0016

The ECM detects an incorrect CMP signal for 5 seconds.

P0340

The ECM detects no CMP signal for 32 top dead center (TDC) cylinder 1 events.

DTC P0340 is a Type A DTC. DTC P0016 is a Type B DTC.

DTC P0340 is a Type A DTC. DTC P0016 is a Type B DTC.

The following conditions can also set the DTC:

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Description and Operation:

Electronic Ignition (EI) System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

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 Data List.

1. Ignition OFF, disconnect the harness connector of the CMP sensor.

Important: The test lamp is used to load the circuit and may not illuminate.

2. Connect a test lamp between the ignition 1 voltage circuit of the CMP sensor and ground.
3. Ignition ON, load test for battery voltage between the ignition 1 voltage circuit of the CMP sensor and ground.

⇒	If less than B+, repair the ignition 1 voltage circuit of the ignition coil for a short to ground or an open/high resistance.

4. Connect a test lamp between the ground circuit and the ignition  1 voltage circuit of the CMP sensor.

⇒	If the test lamp does not illuminate, test for an open/high resistance on the ground circuit. If circuit/connections test normal, replace the ECM.

5. Ignition OFF, connect a DMM between the signal circuit and the low reference circuit of the CMP sensor.
6. Ignition ON, verify that 4.8-5.2 volts is available on the signal circuit and the low reference circuit of the CMP sensor.

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

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.