P0335

DTC P0335

CIRCUIT DESCRIPTION
The crankshaft position (CKP) sensor works in conjunction with the 58X reluctor trigger wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60 tooth spacing, with 2 missing teeth for the reference gap or sync pulse. The engine control module (ECM) provides a 5-Volt reference to the sensor, as well as a low reference, and a signal circuit. As the crankshaft rotates, the reluctor trigger wheel interrupts a magnetic field produced by a magnet internal to the sensor. The CKP sensor internal circuitry detects this interruption of the magnetic field, and produces an ON/OFF DC voltage of varying frequency. The frequency of the CKP sensor output signal is dependent upon crankshaft speed. The ECM uses each CKP output signal to determine crankshaft speed, identify crankshaft position, and to detect engine misfire. If the ECM detects that there is no output signal from the CMP sensor, then DTC P0335 will set.

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

CONDITIONS FOR RUNNING THE DTC
- DTCs P0101, P0102, P0103, P0341, P0342, or P0343 are not set.
- The camshaft position (CMP) sensor signal is incrementing.
- The mass air flow (MAF) is more than 5 g/s.
- The engine is cranking or running.
- DTC P0335 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The ECM detects that there is no signal from the CKP sensor for 3 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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.

DIAGNOSTIC AIDS
DTC P0335 and P0340 will set with the ignition switch in the Start position, if the starter motor is inoperative, or the starter motor control circuit is inoperative. When the ECM enables starter motor operation the ECM also initiates the diagnostic test routines for DTCs P0335 and P0340. If a condition exists which prevents the engine from cranking, then the ECM will not receive a signal input from the CKP and the camshaft position (CMP) sensors, resulting in the DTCs setting.

TEST DESCRIPTION

Step 1 - Step 9:

Step 10 - Step 17:

The numbers below refer to the step numbers on the diagnostic table.
3. This step determines if the fault is present.
6. This step simulates a CKP sensor signal to the ECM. If the ECM receives the signal, the fuel pump will operate for about 2 seconds.