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:

P0341

The CMP sensor reference pulse is not detected at the correct interval every 4 cylinders.

P0342

The ECM detects no CMP pulses in 32 camshaft rotations.

The following conditions can also set the DTC:

Schematic Reference

Engine Controls Schematics

Description and Operation

Electronic Ignition (EI) System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, observe the DTC information with a scan tool. DTCs P0341 and P0342 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.

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.

•	Notchback ignition 1 voltage circuit terminal 1

•	Hatchback ignition 1 voltage circuit terminal 3

⇒	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 ignition  1 voltage circuit and the low reference circuit terminal 2. Verify the test lamp illuminates.

•	Notchback ignition 1 voltage circuit terminal 1

•	Hatchback ignition 1 voltage circuit terminal 3

⇒	If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If circuit tests normal, replace the ECM.

4. Ignition ON, test for 4.8-5.2 volts between the signal circuit and the low reference circuit terminal 2.

•	Notchback ignition 1 voltage circuit terminal 3

•	Hatchback ignition 1 voltage circuit terminal 1

⇒	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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.