DTC P0341. GMC Truck GMC K Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC K Sierra - 4WD (CNG) 🢒 DTC 🢒 DTC P0341

Circuit Description

The camshaft position (CMP) sensor is a sensor designed to detect changes in a magnetic field. The powertrain control module (PCM) supplies the CMP sensor with a 12-volt reference, a low reference, and a signal circuit. The CMP sensor produces a magnetic field whenever the ignition is ON. The CMP sensor is mounted near a reluctor wheel that is part of the camshaft. When the camshaft rotates the reluctor wheel interrupts the magnetic field. The CMP sensor converts each change in the magnetic field into a pulse. The PCM and the alternative fuels ECM use the CMP sensor signal in order to calculate the correct timing for sequential fuel injection. This DTC sets when the alternative fuels ECM does not detect a CMP signal while the engine is running.

Conditions for Running the DTC

•	DTCs P0101, P0102, P0103 are not set.

•	MAP value is less than 105 kPa.

•	The MAF is greater than 3 gms/sec.

Conditions for Setting the DTC

•	The alternative fuels ECM does not detect a CMP sensor reference pulse.

•	The condition exists for at least 2 seconds.

Action Taken When the DTC Sets

•	The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

•

The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

•	The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

•	A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

•	A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

•	Clear the MIL and the DTC with a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

This step determines if the fault is present.

This step determines if the condition affects the PCM. If the CMP high to low and low to high transition parameters increment, then the condition only affects the alternative fuels ECM.

This step tests the ignition feed circuit of the CMP sensor.

This step tests the low reference circuit of the CMP sensor.

This step tests the signal circuit of the CMP sensor. If the scan tool parameters increment when the test lamp contacts the signal circuit, then the wiring and modules are OK.

This step tests if the alternative fuels ECM is the cause of the condition. If the scan tool parameters increment when the alternative fuels ECM is disconnected, the signal circuit, and the PCM are OK.

Step

Action

Yes

Schematic Reference: Engine Controls Schematics

Did you perform the Diagnostic System Check Alternative Fuels - Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Alternative Fuels (Engine Controls)

With a scan tool, establish communication with the alternative fuels ECM.
Start and idle the engine for 2 minutes.
Monitor the Alternative Fuels ECM DTC information with a scan tool.

Does the scan tool indicate that DTC P0341 failed this ignition?

Go to Step 4

Go to Step 3

Observe the Freeze Frame and/or the Failure records data for this DTC.
Turn the ignition OFF for 30 seconds.
Start the engine.
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 and/or the Failure records data.
Monitor the Alternative Fuels ECM DTC information with a scan tool.

Does the DTC fail this ignition cycle?

Go to Step 4

Go to Intermittent Conditions

With a scan tool, establish communication with the PCM.
Monitor the CMP high to low and the low to high transition parameters with the scan tool.

Do the scan tool parameters increment?

Go to Step 10

Go to Step 5

Turn OFF the ignition.
Disconnect the CMP sensor. Refer to Camshaft Position Sensor Replacement in Engine Controls in the C/K Pickup Service Manual.
Turn ON the ignition, with the engine OFF.
Probe the CMP ignition feed circuit with a test lamp connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 11

Probe the CMP sensor low reference circuit with a test lamp connected to battery positive.

Does the test lamp illuminate?

Go to Step 7

Go to Step 12

With a scan tool, establish communication with the PCM.
Monitor the CMP high to low and the low to high transition parameters with the scan tool.
With a test lamp connected to B+ momentarily probe the CMP sensor signal circuit.

Do the fuel injectors pulse when the test lamp contacts the signal circuit?

Go to Step 14

Go to Step 8

Turn OFF the ignition.
Disconnect the alternative fuels ECM connector C001. Refer to Alternative Fuels Engine Control Module Replacement .
Turn ON the ignition, with the engine OFF.
Monitor the CMP high to low and the low to high transition parameters with the scan tool.
With a test lamp connected to B+ momentarily and repeatedly probe the CMP sensor signal circuit.

Do the scan tool parameters increment when the test lamp contacts the signal circuit?

Go to Step 17

Go to Step 9

Test the CMP sensor signal circuit for an open, short to ground, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.