P0366
DTC P0341, P0346, P0366, or P0391
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 P0346
- Intake Camshaft Position Sensor Performance Bank 2
DTC P0366
- Exhaust Camshaft Position Sensor Performance Bank 1
DTC P0391
- Exhaust Camshaft Position Sensor Performance Bank 2
Diagnostic Fault Information
Circuit/System Description
The 4X camshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an output signal circuit. The camshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the camshaft position sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the camshaft position sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. 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, to control camshaft phasing, and for limp-home operation.
Conditions for Running the DTC
* DTC P0335, P0336, P0641 or P0651 is not set.
* The engine is cranking or running.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
Important: The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor is more than 3 g/s, or by sensing crankshaft position sensor pulses.
* The ECM detects that the engine has started, but has received either of the following during the first engine revolution:
- Less than or more than 4 camshaft position sensor pulses, if equipped with an automatic transmission
- Less than 4 or more than 8 camshaft position sensor pulses, if equipped with a manual transmission
OR
* The ECM detects that the engine is running but receives less than 398 camshaft position or more than 402 camshaft position sensor pulses per 100 engine cycles in 800 of 1000 engine cycles.
Action Taken When the DTC Sets
* DTCs P0341, P0346, P0366, and P0391 are Type B DTCs.
* The camshaft position actuator is commanded to the Home or Parked position.
* The ignition system defaults to a failed camshaft position sensor based on the crankshaft position sensor.
Conditions for Clearing the MIL/DTC
* DTCs P0341, P0346, P0366,, and P0391 are Type B DTCs.
* With a DTC set, the engine may crank for an extended period of time at start-up.
Diagnostic Aids
* With a DTC set, the engine may crank for an extended period of time at start-up
* 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
Electronic Ignition System Description (Electronic Ignition System Description)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* 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. If DTC P0340, P0345, P0365, or P0390 are also set, diagnose them first
2. With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions:
* Close routing of secondary ignition components
* Close routing of aftermarket electrical equipment
* Close to solenoids, motors, and relays
• Correct any wire harness routing or component placement conditions if it is determined to be a possible source of electrical interference.
3. Observe the following parameters are all incrementing:
* Exhaust Camshaft Position Bank 1 Active
* Intake Camshaft Position Bank 1 Active
* Exhaust Camshaft Position Bank 2 Active
* Intake Camshaft Position Bank 2 Active
4. Operate the vehicle within the Conditions for Running the DTC. 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, inspect the camshaft position sensor for looseness and correct installation.
• If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
2. Inspect the engine for the following conditions:
* Engine oil for debris
* Camshaft reluctor wheel for damage
* Camshaft end play for excess movement-Refer to Engine Mechanical Specifications (Service Limits & General Specifications).
* The timing chain, tensioner, and sprockets for wear or damage
• If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components. Refer to Camshaft Timing Drive Components Cleaning and Inspection (65. Camshaft Timing Drive Components Cleaning and Inspection) and Camshaft Cleaning and Inspection (62. Camshaft Cleaning and Inspection).
Component Test
Important: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Inspect the camshaft position sensor for looseness and correct installation. Remove the camshaft position sensor from the engine and inspect the sensor and the O-ring for damage.
• If the sensor is loose, incorrectly installed, or damaged, repair or replace the camshaft position sensor.
2. Connect the camshaft position sensor connector to the camshaft position sensor. Turn ON the ignition, with the engine OFF.
3. Ignition ON and engine OFF. Observe the applicable Camshaft Position Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The Camshaft Position Active Counter parameter should increment.
• If the parameter does not increment, replace the 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