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: Intake Camshaft Position (CMP) Sensor Performance Bank 1DTC P0342: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1
DTC P0343: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1
DTC P0346: Intake Camshaft Position (CMP) Sensor Performance Bank 2
DTC P0347: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2
DTC P0348: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance Bank 1
DTC P0367: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1
DTC P0368: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1
DTC P0391: Exhaust Camshaft Position (CMP) Sensor Performance Bank 2
DTC P0392: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2
DTC P0393: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
CMP Sensor 5-Volt Reference | P0343, P0348, P0368, P0393, P2122, P2138 | P0343, P0348, P0368, P0393 | P0651, P2123, P2138 | P0341, P0346, P0366, P0391, P2138 |
CMP Sensor Signal Intake Bank 1 | P0342 | P0343 | P0343 | P0341 |
CMP Sensor Signal Intake Bank 2 | P0347 | P0348 | P0348 | P0346 |
CMP Sensor Signal Exhaust Bank 1 | P0367 | P0368 | P0368 | P0366 |
CMP Sensor Signal Exhaust Bank 2 | P0392 | P0393 | P0393 | P0391 |
Low Reference | -- | P0343, P0348, P0368, P0393 | -- | P0341, P0346, P0366, P0391 |
Circuit/System Description
Each camshaft is equipped with a camshaft position (CMP) sensor that the engine control module (ECM) monitors. The CMP sensor is a hall effect switch that works in conjunction with a 4X reluctor wheel. The reluctor wheels are mounted to the camshaft position actuators that are mounted to the end of the camshafts. The ECM uses the CMP sensor signals in order to determine the position of the camshafts. The ECM supplies 5 volts to the CMP sensors on the 5-volt reference circuits, and supplies a ground on the low reference circuits. The CMP sensors provide a signal to the ECM on the signal circuits. If the ECM detects extra or missing CMP sensor signal transitions, or a signal voltage that is more or less than the predetermined range, within a certain number of crankshaft revolutions, one of these DTCs sets.
Conditions for Running the DTC
| • | The engine is operating for greater than 1 second. |
| • | The DTCs run continuously once the above condition is met. |
Conditions for Setting the DTC
P0341, P0346, P0366, P0391
| • | The ECM detects a signal from the CMP sensor, but the number of pulses are less than or greater than what is expected for one crankshaft revolution. |
| OR |
| • | The CMP sensor does NOT correlate to the crankshaft position. |
| • | Either condition must exist for greater than 4 seconds, or cumulative of 50 seconds. |
P0342, P0347, P0367, P0392
The CMP sensor signal voltage is always low and the ECM detects no pulses from the CMP sensor for greater than 4 seconds, or cumulative of 50 seconds.
P0343, P0348, P0368, P0393
The CMP sensor signal voltage is always high and the ECM detects no pulses from the CMP sensor for greater than 4 seconds or cumulative of 50 seconds.
Action Taken When the DTC Sets
DTCs P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, and P0393 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, and P0393 are Type B DTCs.
Diagnostic Aids
| • | Test the current out-put of the signal circuit if you suspect high resistance in the circuit. The current out-put should be greater than 1 mA when measured on the 400 mA scale. |
| • | 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
Camshaft Actuator 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 idling, observe the scan tool DTC information. DTCs P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, and P0393 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 are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
- Ignition OFF, remove the fuse that supplies B+ to terminal X2-56 of the ECM.
- Disconnect the harness connector at the appropriate CMP sensor.
- Test for less than 5 ohms between the low reference circuit terminal 1 and ground.
- Install the fuse that supplies B+ to terminal X2-56 of the ECM.
- Ignition ON, test for greater than 4.8 volts between the 5 volt reference circuit terminal 3 and ground.
- Test for 4.8-5.2 volts between the signal circuit terminal 2 and ground.
- If all circuits/connections test normal, replace the CMP sensor.
Important: The control module or the sensor may be damaged if the circuit is shorted to B+ .
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance or a short to voltage. If the circuit/connections test normal, replace the ECM. |
| ⇒ | If less than the specified range, test the 5 volt reference circuit for an open/high resistance. If the circuits/connections test normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM. |
Important: The signal circuit voltage can be within the specified range with a high resistance in the circuit. If this condition is suspected, refer to Diagnostic Aids.
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM. |
Repair Instructions
Perform the Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
