P0391
DTC P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, or P0393
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0341
- Intake Camshaft Position Sensor Performance Bank 1
DTC P0342
- Intake Camshaft Position Sensor Circuit Low Voltage Bank 1
DTC P0343
- Intake Camshaft Position Sensor Circuit High Voltage Bank 1
DTC P0346
- Intake Camshaft Position Sensor Performance Bank 2
DTC P0347
- Intake Camshaft Position Sensor Circuit Low Voltage Bank 2
DTC P0348
- Intake Camshaft Position Sensor Circuit High Voltage Bank 2
DTC P0366
- Exhaust Camshaft Position Sensor Performance Bank 1
DTC P0367
- Exhaust Camshaft Position Sensor Circuit Low Voltage Bank 1
DTC P0368
- Exhaust Camshaft Position Sensor Circuit High Voltage Bank 1
DTC P0391
- Exhaust Camshaft Position Sensor Performance Bank 2
DTC P0392
- Exhaust Camshaft Position Sensor Circuit Low Voltage Bank 2
DTC P0393
- Exhaust Camshaft Position Sensor Circuit High Voltage Bank 2
Diagnostic Fault Information
Circuit/System Description
Each camshaft is equipped with a camshaft position sensor that the engine control module (ECM) monitors. The camshaft position 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 camshaft position sensor signals in order to determine the position of the camshafts. The ECM uses the cylinder 1 intake camshaft position sensor to determine injector and ignition system synchronization. Also, the cylinder 1 intake camshaft position sensor is used to determine camshaft to crankshaft relationship. The ECM supplies 5 V to the camshaft position sensors on the 5 V reference circuits, and supplies a ground on the low reference circuits. The camshaft position sensors provide a signal to the ECM on the signal circuits. If the ECM detects extra or missing camshaft position 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 ECM detects greater than 10 crankshaft revolutions.
* The engine speed is less than 2,520 RPM.
* 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 camshaft position sensor, but the number of pulses are less than or greater than what is expected for one crankshaft revolution.
OR
* The camshaft position sensor does NOT correlate to the crankshaft position.
* Either condition must exist for greater than 1 s, or cumulative of 10 s.
P0342, P0347, P0367, P0392
The camshaft position sensor signal voltage is always low and the ECM detects no pulses from the camshaft position sensor for greater than 1 s, or cumulative of 10 s.
P0343, P0348, P0368, P0393
The camshaft position sensor signal voltage is always high and the ECM detects no pulses from the camshaft position sensor for greater than 1 s or cumulative of 10 s.
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
The following conditions can also set the DTC:
* Physical damage to the camshaft position sensor or the reluctor wheel
* Excessive play or looseness of the camshaft position sensor or the reluctor wheel
* Improper installation of the camshaft position sensor or the reluctor wheel
* Foreign material passing between the camshaft position sensor and the reluctor wheel
* Excessive air gap between the camshaft position sensor and the reluctor wheel
* The cylinder 1 intake camshaft position sensor is used for injector and ignition system synchronization. A stalling condition will occur if the CMP sensor signal is intermittent and a DTC will not set. Inspect all cylinder 1 intake camshaft position sensor circuits for poor connections.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Camshaft Actuator System Description (Camshaft Actuator System)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. DTC P0651, P0652 or P0653 should not be set.
• If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM) (ECM).
2. Engine idling, observe the DTC information with a scan tool. DTC P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, or P0393 should not set.
3. 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
1. Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
2. Disconnect the harness connector at the appropriate B23 camshaft position sensor.
Note: The control module or the sensor may be damaged if the circuit is shorted to B+ voltage.
3. Test for less than 5 ohm between the low reference circuit terminal 1 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance or for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
4. Install the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
5. Ignition ON, test for greater than 4.8 V between the 5 V reference circuit terminal 3 and ground.
• If less than the specified value, test the 5 V reference circuit for an open/high resistance. If the circuits/connections test normal, replace the K20 ECM.
6. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
• If greater than specified range, test for a short to voltage in the signal circuit. If circuit/connections test normal, replace the K20 ECM.
• If less than the specified range, test for a short to ground or an open/high resistance in the signal circuit. If circuit/connections test normal, replace the K20 ECM.
7. If all circuits/connections test normal, replace the B23 camshaft position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust (Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust)
* Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake (Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake)
* Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust (Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust)
* Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake (Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming