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 P0016: Camshaft Position (CMP) Sensor PerformanceDTC P0340: Camshaft Position (CMP) Sensor Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage | * | P0340 | -- | P0016 |
CMP Sensor Signal | P0016, P0340 | P0340 | P0340 | P0016 |
Low Reference | -- | P0340 | -- | P0016 |
* Engine cranks but does not run and the fuse for the ignition circuit opens. | ||||
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
| • | DTCs P0335 and P0336 are not set. |
| • | The engine is running. |
| • | The DTCs run continuously once the above conditions are met. |
Conditions for Setting the DTC
P0016
The ECM detects an incorrect CMP signal for greater than 10 crankshaft revolutions.
P0340
The ECM detects no CMP signal for greater than 1 second.
Action Taken When the DTC Sets
DTCs P0016 and P0340 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0016 and P0340 are Type A 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
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 P0016 and P0340 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, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 1 and ground.
- Connect a test lamp between the ground circuit terminal 2 and the ignition 1 voltage circuit terminal 1. Verify the test lamp illuminates.
- Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 3 and the ground circuit terminal 2.
- If all circuits test normal, test or replace the CMP sensor.
| ⇒ | If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary. |
| ⇒ | If the test lamp does not illuminate, repair the the ground circuit for an open/high resistance. |
| ⇒ | 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 ECM replacement, setup, and programming |
