P0341

DTC P0341:

CIRCUIT DESCRIPTION
During cranking, the ignition control module monitors the 3X crankshaft position sensor sync signal. The sync signal is used to determine the correct cylinder pair to spark first. After the sync signal has been processed by the ignition control module, it sends a fuel control reference pulse to the Powertrain Control Module (PCM) on CKT 430. When the PCM receives this pulse it will command all six injectors to open for one priming shot of fuel in all cylinders.
After the priming, the injectors are left "OFF" for the next six fuel control reference pulses from the ignition control module (two crankshaft revolutions). This allows each cylinder a chance to use the fuel from the priming shot. During this waiting period, a cam pulse will have been received by the PCM.
Now the PCM begins to operate the injectors sequentially based on true camshaft position. With the engine running, the PCM monitors the cam and fuel control references pulses it receives and expects to see six fuel control pulses for each cam pulse.

DIAGNOSTIC TROUBLE CODE (DTC) P0341 WILL SET WHEN
^ Ratio of fuel control pulses to cam pulses does not equal 6:1, (more cam pulses).
^ Above condition for 10 occurrences during key cycle.

ACTION TAKEN (PCM WILL DEFAULT TO)
With a current DTC P0341 set, the Malfunction Indicator Lamp (MIL) (Service Engine Soon) will be illuminated for the remainder of the key cycle.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. Determines if conditions necessary to set DTC P0341 exist.
2. Determines if fault is in the wiring, camshaft sensor or PCM.

DIAGNOSTIC AIDS
DTC P0341 indicates an intermittent fault and may not set immediately or under all conditions. Customer comments of symptom experienced may help isolate the cause of the condition. A poor connection or fault in the camshaft position sensor CKTs 630, 639 or 251, or a faulty camshaft position sensor may cause the PCM to reinitialize injector sequence when the fault occurs, causing a possible stumble or miss.