P0341

DTC P0341 CMP Sensor Circuit Performance




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 Malfunction Indicator Lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the malfunction present.
- The PCM will record the operating conditions at the time that the diagnostic fails. The Freeze Frame and Failure Records buffers will store this information.
- A history DTC stores.

Conditions for Clearing the MIL/DTC
- The MIL will turn off after 3 consecutive ignition cycles in which the diagnostic runs without a fault
- A history DTC will clear after 40 consecutive warm up cycles without a fault
- A scan tool can clear the DTCs

Diagnostic Aids
- A poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation may cause an Intermittent problem.
- Thoroughly check 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 resync's 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.

Step 1:

Steps 2 - 5:

Steps 6 - 10:

Steps 11 - 12:

Test Description
The number(s) below refer(s) to the step number(s) on the Diagnostic Table.
1. The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the this DTC set. The scan tool stores this data for later reference.
2. If the conditions for the test as described above are met, a DTC P0325 will set and the MIL will illuminate.
3. If the engine has an internal knock or an audible noise that causes a knocking type of noise on the engine block, this is an indication that the knock sensor may be responding to the noise.
5. This step checks the internal resistance of the knock sensor or the wiring to the knock sensor.
6. Thoroughly check any suspected circuitry for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wiring connections
- Physical damage to the wiring harness
7. Reprogram the replacement PCM and perform the crankshaft position system variation learn procedure. Refer to the latest Isuzu Technical Communication System (ITCS) information for PCM programming and the CKP System Variation Learn Procedure for the crankshaft position system variation learn procedure.