P0341

DTC P0341

CIRCUIT DESCRIPTION
The DTC P0341 Camshaft Position (CMP) Sensor Performance diagnostic monitors the signal from the CMP sensor. The CMP sensor is a magnetic generator type sensor that produces an AC signal. The CMP sensor signal increases in frequency as the engine RPM increases. The camshaft position signal is used by the powertrain control module (PCM) to determine the optimum ignition timing and the optimum fuel delivery. The CMP sensor is also used to monitor engine misfire and monitor the operation of the CMP actuator system.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0341 Camshaft Position (CMP) Sensor Performance

CONDITIONS FOR RUNNING THE DTC
- The engine speed is more than 600 RPM.
- DTC P0341 runs continuously once the above condition has been met.

CONDITIONS FOR SETTING THE DTC
The camshaft position sensor signal to the PCM does match the expected count.

ACTION TAKEN WHEN THE DTC SETS
- The PCM illuminates the malfunction indicator lamp (MIL).
- The PCM stores the conditions which were present when the DTC set as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
- The PCM turns OFF the MIL on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
- The DTC clears after 40 consecutive warm-up cycles have occurred without a fault.
- A DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
- Check for any of the following conditions:
- The CMP sensor output may be affected by temperature. Check the sensors operation and internal resistance at various temperatures. The CMP sensor resistance when cold should be between 835-1,400 ohms at -10 to +50°C (+14 to +122°F). The CMP sensor resistance when hot should be between 1,060-1,645 ohms at 50-100°C (122-212°F).
- The CMP sensor performance can be checked with a DMM and a scan tool. The AC voltage output of the CMP sensor, as measured with a DMM across the sensor electrical terminals, is approximately the same as engine speed. Run the engine at several different engine speeds and compare the numerical value on the scan tool with the numerical voltage reading on the DMM. If the reading of the DMM and the scan tool are not nearly equal, check for a faulty sensor or signal rotor.
- A DTC P0341 that sets while driving and checks OK may be caused by inadequate CMP sensor circuit shielding. Check that the CMP sensor circuit is properly shielded and that the drain wire is fastened securely to ground.
- An intermittent malfunction may be caused by a fault in the CMP sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition.
- Repair any electrical circuit faults that were found.
- The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.

TEST DESCRIPTION

Step 1 - Step 10:

Step 11 - Step 16:

The numbers below refer to the step numbers on the diagnostic table.
1. The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. This step tests for an open in the ground circuit of the CMP sensor from PCM connector C 1 terminal 34 to SP108. The engine will not stay running and DTC P0341 will set if the CMP sensor and CKP sensor ground circuit is open.
3. This step determines if DTC P0341 is the result of a hard failure or an intermittent condition.
5. This step verifies the internal resistance of the camshaft position sensor. A typical value at 23°C (74°F) is 1.1K ohms.
6. This step verifies the CMP sensor output signal. The CMP sensor sends the PCM one electrical pulse for every revolution of the intake camshaft. Therefore, the AC signal generated by the CMP sensor will be numerically analogous to the engine speed. With the engine speed at about 1,200 RPM, the CMP sensor voltage should be around 2.450-2.550 volts AC.
8. This step tests the CMP input circuit to the PCM. The AC signal generated by the CMP sensor will be numerically analogous to the engine speed. With the engine speed at about 1,200 RPM, the CMP sensor voltage should be around 2.450-2.550 volts AC. The CMP sensor signal wire must be removed from the PCM connector in order to accurately check the sensor output. If the CMP sensor signal wire is backprobed while connected to the PCM, the AC voltage indicated on a DMM will be approximately 15-20 percent lower than the actual engine speed.
12. This step inspects for a faulty signal rotor on the camshaft. Visually inspect the tooth of the signal rotor through the CMP sensor aperture for damage, foreign material, and installation.