P0340
DTC P0340 or P0365
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 P0340
- Intake Camshaft Position Sensor Circuit
DTC P0365
- Exhaust Camshaft Position Sensor Circuit
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 also uses camshaft position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.
Conditions for Running the DTC
* DTCs P0101, P0102, P0103, P0340 and P0365 are not set.
* The engine is cranking or running.
* The mass air flow (MAF) is greater than 3 grams per s.
* The DTCs run continuously when the above condition is met.
Conditions for Setting the DTC
P0340
The ECM does not receive 4 camshaft pulses within 3 s.
P0365
The ECM does not receive 4 camshaft pulses within 3 s
Action Taken When the DTC Sets
DTC P0340, and P0365 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTC P0340, and P0365 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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. Engine idling, observe the scan tool Intake and Exhaust Camshaft Position Active Counter parameters. Both parameters should be incrementing.
2. Engine idling, observe the DTC information with a scan tool. DTC P0340 or P0365 should not set.
3. 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. Engine idling, move the related harnesses/connectors of the appropriate B23 camshaft position sensor while monitoring the scan tool Camshaft Position Variance parameter. The Camshaft Position Variance parameter should not change when moving the harness/connectors.
• If the above condition exists, repair the harness/connectors as necessary.
2. Ignition OFF, inspect the appropriate B23 CMP sensor for correct installation.
• If the B23 camshaft position sensor is loose, inspect the sensor and the O-ring for damage, and replace as necessary.
3. Ignition OFF, disconnect the harness connector at the appropriate B23 camshaft position sensor.
4. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohm 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 tests normal, replace the K20 ECM.
5. Ignition ON, test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal 1 and ground.
• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
6. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground.
• If less than the specified range, test the affected signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
• If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
7. Ignition OFF, connect a 3 A fused jumper wire to the camshaft position signal circuit terminal 3.
8. Ignition ON, momentarily touch the end of the fused jumper wire to the ground while monitoring the scan tool Camshaft Position Active Counter. The Camshaft Position Active Counter should increment.
• If the Camshaft Position Active Counter does not increment, replace the K20 ECM.
9. If all circuits test normal, replace the B23 camshaft position sensor.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Inspect the B23 camshaft position sensor for correct installation. Remove the B23 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 B23 camshaft position sensor.
2. Connect the camshaft position sensor connector to the B23 camshaft position sensor. Turn ON the ignition, with the engine OFF.
3. Ignition ON, and engine OFF. Observe the 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 B23 camshaft position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Camshaft Position Sensor Replacement - Exhaust (Camshaft Position Sensor Replacement - Exhaust)
* Camshaft Position Sensor Replacement - Intake (Camshaft Position Sensor Replacement - Intake)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming