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 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 | 1 | P0340 | -- | P0016 |
CMP Sensor Signal | P0016, P0340 | P0340 | P0340 | P0016 |
Low Reference | -- | P0340 | -- | P0016 |
1. 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.
P0340
The ECM detects no CMP signal for more than 4 crankshaft revolutions.
Action Taken When the DTC Sets
| • | DTC P0016 is a Type C DTC. |
| • | DTC P0340 is a Type B DTC. |
Conditions for Clearing the DTC
| • | DTC P0016 is a Type C DTC. |
| • | DTC P0340 is a Type B DTC. |
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
Circuit/System Verification
- Start the engine. Observe the DTC information with a scan tool. DTCs P0016 and P0340 should not set.
- If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.
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 and ground.
- Connect a test lamp between the ground circuit and the ignition 1 voltage circuit. Verify the test lamp illuminates.
- Ignition ON, test for 4.8-5.2 volts between the signal circuit and the ground circuit.
- If all circuits/connections test normal, 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 open/high resistance on the ground circuit. |
| ⇒ | If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM. |
| ⇒ | If more than 5.2 volts, test the signal circuit for a short to voltage. If the circuits/connections test 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 |
