The 4X camshaft position (CMP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the CMP sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the CMP sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.

Important: The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor is more than 3 g/s, or by sensing crankshaft position (CKP) sensor pulses.

DTC P0340 is a Type B DTC.

DTC P0340 is a Type B DTC.

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

1. With the engine running, observe the CMP Sensor parameter using the scan tool. The CMP Sensor speed should match the Engine Speed parameter within 100 RPM.

⇒	If the CMP Sensor speed is 0, continue with Circuit/System Testing.

2. With the ignition ON and the engine OFF, use the Live Plot function on the scan tool. Select the Engine Speed parameter and the CMP Sensor parameter. Change the minimum spec to 0 RPM for both parameters. Change the maximum spec to 1,500 RPM for both parameters.
3. Observe the scan tool and start the engine. The graphed lines should stay together.
4. With the engine running, use the Live Plot function on the scan tool. Select the Engine Speed parameter and the CMP Sensor parameter. Change the minimum spec to 400 RPM for both parameters. Change the maximum spec to 3,000 RPM for both parameters.
5. Observe the scan tool and operate the vehicle under 3,000 RPM within the Conditions for Running the DTC. The graphed lines should stay together.
6. With the engine running, use the Live Plot function on the scan tool. Select the Engine Speed parameter and the CMP Sensor parameter. Change the minimum spec to 3,000 RPM for both parameters. Change the maximum spec to 5,500 RPM for both parameters.
7. Observe the scan tool and operate the vehicle, between 3,000-5,500 RPM, within the Conditions for Running the DTC. The graphed lines should stay together.

1. Ignition OFF, disconnect the multi-way engine harness to fuel injector harness connector X105.
2. Test for less than 1 ohm between ECM side of the low reference circuit terminal N and ground.

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

3. Ignition ON, test for 4.8-5.2 volts between the ECM side of the 5-volt reference circuit terminal P and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Ignition ON, test for 4.8-5.2 volts between the ECM side of the signal circuit terminal R and ground.

⇒	If less than the specified range, test the signal circuit for an open/high resistance or short to ground. 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. Ignition ON, using a jumper wire connected to ground, momentarily touch the CMP sensor signal circuit terminal R repeatedly. The CMP active counter parameter should increment.

⇒	If the CMP active counter does not increment, replace the ECM.

6. Ignition OFF, inspect the wiring harness, from the multi-way connector X105 to the CMP sensor, for any damage, opens, or shorts.

⇒	If the circuits test normal, replace the CMP sensor.

1. Inspect the CMP sensor for looseness and correct installation. Remove the CMP sensor from the engine and inspect the sensor and the O-ring for damage.

⇒	If the sensor is loose, incorrectly installed, or damaged. Repair or replace the CMP sensor.

2. Connect the CMP sensor connector to the CMP sensor. Turn ON the ignition, with the engine OFF.
3. Observe the CMP Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The CMP Active Counter parameter should increment.

⇒	If the parameter does not increment, replace the CMP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.