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 provide an overview of each diagnostic category. |
DTC Descriptor
DTC P0341: Camshaft Position (CMP) Sensor PerformanceDiagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
CMP 5-Volt Reference | P0642 | P0340 | P0340 | P0643 | P0341 |
CMP Sensor Signal | P0340 | P0340 | P0340 | P0340 | P0341 |
CMP Low Reference | -- | P0340 | P0340 | -- | P0341 |
Typical Scan Tool Data
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: Engine running | ||||
CMP 5-Volt Reference Voltage | Yes | No | No | Yes |
CMP Sensor Signal | Yes | No | No | No |
CMP Low Reference | Yes | -- | No | -- |
Circuit/System Description
The hall effect camshaft position (CMP) sensor produces 3 ON/OFF pulses for each revolution of the camshaft. The CMP output is pulse width encoded. The engine control module (ECM) uses the CMP and crankshaft position (CKP) output pulses to determine the engine speed and position. The CMP is connected directly to the ECM by the following circuits:
| • | The 5-volt reference circuit |
| • | The low reference circuit |
| • | The CMP sensor signal circuit |
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The engine is turning faster than 50 RPM. |
| • | DTC P0341 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
The ECM determines that the CMP sensor signal is out of range.
Action Taken When the DTC Sets
DTC P0341 is a Type A DTC.
Conditions for Clearing the MIL/DTC
DTC P0341 is a Type A DTC.
Diagnostic Aids
If the CMP sensor signal is lost while running, the engine will operate normally. If the CMP sensor signal is not present on start-up, the engine will not start.
Reference Information
Schematic Reference
Connector End View Reference
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
- If DTCs P0642 or P0643 are set, diagnose those DTCs first.
- Engine running, observe the DTC information with a scan tool. DTC P0341 should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Ensure that the CMP sensor circuits are not routed too closely to the fuel injector wiring, after-market add-on electrical equipment, solenoids, relays, or motors.
- Inspect the CMP sensor for physical damage, loose or improper installation, foreign material passing between the sensor and the reluctor wheel, timing gear misalignment, or front engine cover damage.
- Inspect the CMP reluctor wheel for physical damage, improper installation, or excessive endplay or looseness.
- If no other condition is found, replace the CMP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
