P0335

DTC P0335

CIRCUIT DESCRIPTION
The crankshaft position (CKP) sensor is a 24X sensor. It provides 24 digital ON/OFF signals to the powertrain control module (PCM) per revolution of the crankshaft. This information is used by the PCM for ignition timing, fuel injector timing, misfire diagnostics, and tachometer display. The PCM supplies 12 volts to the sensor on the 12-volt reference circuit, and provides a ground on the low reference circuit. The CKP sensor provides signals to the PCM on the medium resolution engine speed signal circuit. The PCM monitors the CKP sensor for errors. If the PCM does not receive a signal from the CKP sensor, DTC P0335 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0335 Crankshaft Position (CKP) Sensor Circuit

CONDITIONS FOR RUNNING THE DTC
- The camshaft position (CMP) sensor signal is incrementing.
- The mass air flow (MAF) is more than 2 g/s.
- The engine is cranking or running.
- The diagnostic runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The PCM has detected no CKP sensor pulses for more than 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/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

Step 1 - Step 11:

Step 12 - Step 21:

Step 22 - Step 27:

The numbers below refer to the step numbers on the diagnostic table.
6. An internally shorted CMP sensor, CKP sensor or a short to ground on either 12-volt reference circuit will set DTCs P0335 and P0340.
8. This step tests for high resistance in the 12-volt reference circuit and the low reference circuit.
10. Any change in RPM verifies that the controller is able to receive a signal.