Service Information

Cruze

DTC P0344

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0344 00: Camshaft Position Sensor Performance

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5V Reference	P0651 00	P0344 00	P0651 00	P0011 00
Signal	P0344 00	P0344 00	P0344 00	P0344 00, P0016 00
Low Reference	-	-	P0344 00, P0016 00	P0011 00

The camshaft position sensor correlates the crankshaft to camshaft position so that the engine control module (ECM) can determine which cylinder is ready to be fuelled 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.

Conditions for Running the DTC

•	DTC P0016 00, P0336 00 or P0339 00 are not set.

•	The engine is running.

•	The engine speed is greater than 50 RPM.

•	The DTC run continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM detects too few camshaft position sensor pulses.

Action Taken When the DTC Sets

DTCs P0344 00 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0344 00 are Type B DTCs.

Diagnostic Aids

The following conditions can also set the DTC:

•	Physical damage to the camshaft position sensor or the reluctor wheel

•	Gap between the camshaft position sensor and the reluctor wheel is out of range

•	Improper installation of the camshaft position sensor or the reluctor wheel

•	Foreign material passing between the camshaft position sensor and the reluctor wheel

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, observe the DTC information with a scan tool. DTCs P0344 00 should not be set.
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.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the B23 Camshaft Position Sensor.
Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the K20 Engine Control Module.

Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

⇒	If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

Ignition On, test for 4.8-5.2 V between the signal circuit terminal 3 and ground.

⇒	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 K20 Engine Control Module.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

If all circuits test normal, test or replace the B23 Camshaft Position Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Camshaft Position Sensor Replacement

•	Control Module References for ECM replacement, setup, and programming