The CMP sensor is a hall effect switch that works in conjunction with a 4X reluctor wheel. The reluctor wheels are mounted to the camshaft position actuators that are mounted to the end of the camshafts. The ECM uses the CMP sensor signals in order to determine the position of the camshafts. The ECM supplies 5 volts to the CMP sensors on the 5-volt reference circuits, and supplies a ground on the low reference circuits. The CMP sensors provide a signal to the ECM on the signal circuits. If the ECM detects extra or missing CMP sensor signal transitions, or a signal voltage that is more or less than the predetermined range, within a certain number of crankshaft revolutions, one of these DTCs sets.

The ECM detects an incorrect signal or no signal from the CMP sensor.

DTC P0340, P0341, and P0366 are Type B DTCs.

DTC P0340, P0341, and P0366 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

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

The following conditions can also set the DTC:

1. Ignition ON, observe the DTC information with a scan tool. DTCs P0340, P0341, or P0366 should not set.
2. Move related harnesses/connectors of the CKP sensor and verify the engine does not stumble, stall, or change engine speed.
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.

1. Ignition OFF, disconnect the harness connector at the appropriate camshaft position (CMP) sensor.
2. Ignition OFF, test for 5 ohms or less of resistance between the low reference circuit terminal 1 and ground.

⇒	If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for greater than 4.8 volts between the 5V reference circuit terminal listed below and ground.

•	CMP Sensor Intake 5V reference circuit terminal 3

•	CMP Sensor Exhaust 5V reference circuit terminal 2

⇒	If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the 5V reference circuit and replace as necessary.

4. Test for 4.8-5.2 volts between the signal circuit terminal listed below and ground.

•	CMP Sensor Intake 5V reference circuit terminal 2

•	CMP Sensor Exhaust 5V reference circuit terminal 3

⇒	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.