Circuit Description
The camshaft position (CMP) sensor indicates the camshaft position so that the powertrain control module (PCM) can determine which cylinder is misfiring when a misfire is present. Whenever the PCM receives an intermittent signal from the CMP, then the CMP resync counter will increment. In order to set a DTC, the PCM must see a minimum number of resync's within a maximum time.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PCM sees more than 15 CMP sensor resyncs in 256 seconds (4 min., 16 sec.).
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles. |
| • | The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame and Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed. |
| • | A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature is more than 70°C (158°F) during the same ignition cycle). |
| • | Use a scan tool to clear the DTCs. |
Diagnostic Aids
| • | A poor connection, rubbed through wire insulation, or a broken wire inside the insulation may cause an intermittent problem. |
| • | Thoroughly inspect any circuitry, that is suspected as causing the intermittent complaint, for the following conditions: |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Physical damage to the wiring harness |
| • | Whenever the PCM sees less than 15 resyncs in 256 seconds, the counter is reset to 0. Anytime a poor connection is present, the cam sensor reference activity counter will stop incrementing and the cam sensor resync counter will increment. |
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
This step determines if the DTC P0341 is the result of a hard malfunction or an intermittent condition.
-
The counter should stop incrementing with the sensor electrical connector disconnected and set a DTC P0342. If the counter still increments, this indicates that the PCM is malfunctioning.
-
By moving the CMP sensor connector, the connections at the sensor are being tested. Make sure that the connector remains securely fastened.
-
A poor connection in any of the circuits at the CMP sensor will cause the CMP resync counter to increment. Anytime a poor connection is present, the CMP reference activity counter will stop incrementing and the CMP resync counter will increment.
-
The replacement PCM must be programmed and the Crankshaft Position System Variation Learn procedure must be performed.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 | Is DTC P0335 also set? | -- | ||
Is the CMP resync counter incrementing? | -- | |||
|
Caution: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.
Did the CMP resync counter stop incrementing? | -- | |||
|
Caution: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury. Wiggle the CMP sensor connector by hand with the engine still running. Did the CMP resync counter start to increment? | -- | |||
Did you find and correct the condition? | -- | |||
|
Important:: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the replacement? | -- | -- | ||
8 |
Did you find and correct the condition? | -- | ||
9 | Replace the camshaft position (CMP) sensor. Refer to Camshaft Position Sensor Replacement . Did you complete the replacement? | -- | -- | |
10 | Operate the vehicle within the Freeze Frame conditions. Is the CMP resync counter incrementing? | -- | ||
11 |
Does the DTC reset? | -- | System OK |
