Diagnostic Instructions
DTC Descriptors
DTC P0016 5A: Camshaft Position (CMP) Sensor Circuit Plausibility Failure
DTC P0340 28: Camshaft Position (CMP) Sensor Circuit Incorrect Frequency
DTC P0340 29: Camshaft Position (CMP) Sensor Circuit Too Few Pulses
DTC P0341: Camshaft Position (CMP) Sensor Circuit
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.
Conditions for Running the DTC
P0016
• | DTCs P0335 and P0336 are not set. |
• | The engine speed is greater than 50 RPM. |
• | The DTCs run continuously once the above conditions are met. |
P0340 and P0341
• | The engine speed is greater than 50 RPM. |
• | 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 too few CMP pulses.
P0341
The ECM detects no CMP signal.
Action Taken When the DTC Sets
DTCs P0016, P0340, and P0341 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0016, P0340, and P0341 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
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
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, P0340, and P0341 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, and the MAIN fuse removed, disconnect the harness connector at the CMP sensor.
- Test for less than 5 ohms of resistance 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 ECM. |
- Install the MAIN fuse. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 3 and ground.
⇒ | 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. |
- Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 1 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 ECM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
- If all circuits test normal, test or replace the CMP sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.