scottyg Posted August 9, 2008 Report Share Posted August 9, 2008 my service engine light came on,but the car is running fine,this code came up on history-po335,anybody know what this means? Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted August 9, 2008 Report Share Posted August 9, 2008 DTC P0335 The powertrain control module (PCM) uses dual crankshaft position (CKP) A and CKP B sensors to determine crankshaft position. The PCM supplies an ignition voltage and a ground for each sensor. During engine rotation, a slotted ring, machined into the crankshaft, causes the sensors to return a series of ON and OFF pulses to the PCM. The PCM uses these pulses to decode the position of the engine crankshaft. The PCM uses two basic methods of decoding the engine position: Angle Based and Time Based (using either CKP A or CKP B sensor input). During normal operation, the PCM uses the angle based method. In order to operate in this mode, the PCM must receive signal pulses from both CKP sensors. The PCM uses the signal pulses to determine an initial crankshaft position, and to generate MEDRES (24X reference) and LORES (4X reference) signals. Once the initial crank position is determined, the PCM continuously monitors both sensors for valid signal inputs. As long as both signal inputs remain, the PCM will continue to use the angle based mode. When either CKP signal is lost, the PCM will compare the MEDRES signal to the camshaft position (CMP) sensor signal. If the PCM detects a valid CMP signal, and the MEDRES to CMP signal correlation is correct, the PCM determines that CKP sensor A is at fault. However, if the MEDRES to CMP correlation is incorrect, the PCM determines that CKP sensor B is at fault. If the PCM determines that CKP sensor A is at fault, diagnostic trouble code (DTC) P0335 will set. The PCM will switch from angle based mode to Time Based mode B using CKP sensor B signal input. Conditions for Running the DTC The engine is cranking or running. Conditions for Setting the DTC The PCM detects a loss of CKP sensor A signal. Action Taken When the DTC Sets * The control module stores the DTC information into memory when the diagnostic runs and fails. * The malfunction indicator lamp (MIL) will not illuminate. * The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. * The driver information center, if equipped, may display a message. 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. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Ranger Posted August 9, 2008 Report Share Posted August 9, 2008 CKP failures are common an 2000 to early '03's. GM had a bad supplier. Replace them both. They are located above the oil filter adapter, which needs to be removed. Link to comment Share on other sites More sharing options...
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