PRE-RELEASE
DTC P0340 or P0365
| DTC P0340 or P0365 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0340
Intake Camshaft Position Sensor Circuit
DTC P0365
Exhaust Camshaft Position Sensor Circuit
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Intake Camshaft Position Sensor 5 V Reference
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P0340, P0641
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P0340
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P0641
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P0341
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Intake Camshaft Position Sensor Low Reference
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-
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P0340
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-
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-
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Intake Camshaft Position Sensor Signal
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P0340
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P0340
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P0340
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-
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Exhaust Camshaft Position Sensor 5 V Reference
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P0641
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P0365
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P0641
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P0366
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Exhaust Camshaft Position Sensor Low Reference
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-
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P0365
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-
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-
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Exhaust Camshaft Position Sensor Signal
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P0365
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P0365
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P0365
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-
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| Circuit/System Description |
The 4 X 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. Each tooth on the reluctor wheel rotates pass the camshaft position sensor and creates a change in the magnetic field. The sensor electronics uses the changes to generate a digital output signal. The sensor returns a digital ON/OFF direct current pulse with varying frequency with 4 output pulses of varying width per camshaft rotation. These represent a picture of the camshaft's 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 |
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The mass air flow (MAF) is greater than 3 grams per second.
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The engine is cranking or running.
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DTCs P0101, P0102, P0103, P0340 and P0365 run continuously when the above condition is met.
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| 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
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Engine idling, observe the scan tool Camshaft Position Active Counter parameter. The parameter should be incrementing.
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| 2. |
With the engine idling, check the DTC Info with a scan tool. The DTC P0340 should not be set.
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| 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.
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| Circuit/System Testing |
| 1. |
Engine idling, move the related harnesses/connectors of the 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.
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| 2. |
If the above condition exists, repair the harness/connectors, as necessary.
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| 3. |
Ignition OFF, inspect the B23 camshaft position sensor for correct installation.
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| 4. |
If the B23 camshaft position sensor is loose, inspect the sensor and the O-ring for damage and replace, as necessary.
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| 5. |
Ignition OFF, disconnect the harness connector at the B23 Camshaft Position Sensor.
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| 6. |
Ignition OFF, all vehicle systems OFF, it may take 2 minutes for all systems to power down, test for less than 5 Ω between the appropriate low reference circuit terminal B and ground.
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| 7. |
If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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| 8. |
Ignition ON, test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal A and ground.
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| 9. |
If less than the specified range, test the 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.
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| 10. |
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.
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| 11. |
Ignition ON, test for 4.8-5.2 V between the appropriate signal circuit terminal C and ground.
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| 12. |
If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.
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| 13. |
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.
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| 14. |
Ignition OFF, connect a 3 A fused jumper wire to the B23 camshaft position signal circuit terminal C.
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| 15. |
Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The Camshaft Position Active Counter parameter on the scan tool should increment.
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| 16. |
If the Camshaft Position Active Counter increments, replace the B23 camshaft position sensor.
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| 17. |
If the Camshaft Position Active Counter does not increment, replace the K20 ECM.
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| Component Testing |
| Note | ||
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You must perform the Circuit/System Testing before proceeding with Component Testing. |
| 1. |
Inspect the 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.
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| 2. |
If the sensor is loose, incorrectly installed, or damaged, repair or replace the B23 camshaft position sensor.
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| 3. |
Connect the sensor connector to the B23 camshaft position sensor.
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| 4. |
Ignition ON and engine OFF. Observe the Camshaft Position Active Counter parameter on the scan tool. While passing a steel object by the tip of the sensor repeatedly. The Camshaft Position Active Counter parameter should increment.
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| 5. |
If the parameter does not increment, replace the B23 camshaft position sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Camshaft Position Sensor Replacement - Exhaust
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Camshaft Position Sensor Replacement - Intake
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Control Module References
for ECM replacement, setup, and programming
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