P0335

CIRCUIT DESCRIPTION
The DTC P0335 Crankshaft Position (CKP) Sensor Circuit diagnostic monitors the signal from the crankshaft position (CKP) sensor. The CKP sensor is a magnetic generator type sensor, producing an alternating current signal. The CKP sensor signal increases in both frequency and amplitude as the engine RPM increases. The CKP sensor sends this reference signal to the powertrain control module (PCM) to indicate the crankshaft RPM and position. This reference signal is used by the PCM to calculate fuel injection pulse, establish top dead center (TDC) for ignition timing and where to start ignition coil and injection sequencing. There will be no spark or fuel delivery if there is no CKP sensor signal.

CONDITIONS FOR RUNNING THE DTC
The crank signal circuit, PCM terminal C3-11, must be pulled high for the diagnostic to run when starting the engine.

CONDITIONS FOR SETTING THE DTC
^ No crankshaft position sensor signal to the PCM for 5 seconds while cranking the engine.

OR

^ No crankshaft position sensor signal to the PCM with the engine speed at 600 RPM or more.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the malfunction indicator lamp (MIL) during the second key cycle in which the DTC sets.
^ The PCM stores the conditions which were present when the DTC set as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM turns OFF the MIL on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
^ A DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.
^ A DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
Check for any of the following conditions:
^ The scan tool will display the engine speed while cranking if the PCM senses the CKP sensor signal.
^ The CKP sensor performance may be affected by temperature. Check the sensors operation and internal resistance at various temperatures. The CKP sensor resistance when cold should be between 1,630 ohms and 2,740 ohms at -10 to +50°C (14-122°F). The CKP sensor resistance when hot should be between 2,065 ohms and 3,225 ohms at 50-100°C (122-212°F).
^ An intermittent DTC P0335 can be caused by a defective signal rotor. Remove the CKP sensor and visually inspect the teeth of the signal rotor through the CKP sensor aperture for damage, foreign material, or incorrect installation.
^ A DTC P0335 that sets while driving and checks OK may be caused by inadequate CKP sensor circuit shielding. Check that the CKP sensor circuit is properly shielded and that the drain wire is fastened securely to ground.

An intermittent malfunction may be caused by a fault in the CKP sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions. Intermittent Conditions

Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Diagrams.

The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.

TEST DESCRIPTION

Steps 1-11:

Steps 12-16:

The numbers below refer to the step numbers on the diagnostic table.
1. The Diagnostic System Check-Computers and Controls Systems prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
3. This step checks whether DTC P0335 is the result of a hard failure or an intermittent condition. If engine will not start, crank the engine over 3 consecutive ignition cycles (key ON-key OFF).
5. This step checks the internal resistance of the crankshaft position sensor. A typical value at 23°C (74°F) is 2.1k ohms.
6. This step checks the CKP sensor output signal.
7. This step checks the CKP sensor electrical circuit to the PCM. The DMM should read the CKP sensor output signal of 1.4-1.6 volts AC when cranking.
8. This step checks the CKP sensor input circuit.
12. This step checks for a faulty signal rotor. Visually inspect the teeth of the signal rotor through the CKP sensor aperture for damage, foreign material, and mis-alignment.