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 Descriptors
DTC P0341: Camshaft Position (CMP) Sensor PerformanceDTC P0342: Camshaft Position (CMP) Sensor
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage | -- | P0342 | -- | P0341 |
CMP Sensor Signal | P0342 | P0342 | P0342 | P0341 |
Low Reference | -- | P0342 | -- | P0341 |
Circuit/System Description
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:
| • | An ignition 1 voltage |
| • | A low reference |
| • | A CMP signal |
Conditions for Running the DTC
| • | The engine is running. |
| • | The DTCs run continuously when the above condition is met. |
Conditions for Setting the DTC
P0341
The ECM detects an incorrect CMP signal.
P0342
The ECM detects no CMP signal.
Action Taken When the DTC Sets
DTCs P0341 and P0342 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0341 and P0342 are Type B DTCs.
Diagnostic Aids
The following conditions can also set the DTC:
| • | Physical damage to the CMP sensor or the reluctor wheel. |
| • | Excessive play or looseness of the CMP sensor or the reluctor wheel. |
| • | Improper installation of the CMP sensor or the reluctor wheel. |
| • | Foreign material passing between the CMP sensor and the reluctor wheel |
| • | Excessive air gap between the CMP sensor and the reluctor wheel |
Reference Information
Schematic Reference
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
Control Module References for scan tool information
Circuit/System Verification
- Engine running, observe the DTC information with a scan tool. DTCs P0341 and P0342 should not 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 CMP sensor.
- Ignition ON, test for battery voltage between the ignition 1 voltage circuit terminal 1 and ground.
- Connect a test lamp between the low reference circuit terminal 2 and the ignition 1 voltage circuit terminal 1.
- Test for 4.8-5.2 volts is between the signal circuit terminal 3 and the low reference circuit terminal 2.
- If all circuits test normal, test or replace the CMP sensor.
| ⇒ | If less than B+, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test for an open/high resistance on the ground circuit. If circuit tests normal, replace the ECM. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
