P0335

CRANKSHAFT POSITION SENSOR





Fault Symptom.
The engine fails to start or misfires.
Other diagnostic trouble codes (misfiring).

Conditions.
PO335
^ Engine speed > 520 rpm.
^ The crankshaft position sensor reads the wrong number of ribs per crankshaft revolution.

PO336
^ Engine speed > 520 rpm.
^ The crankshaft position sensor cannot find the gap in the toothed wheel.

Diagnostic Help.
The diagnostic trouble code usually indicates an intermittent fault.

The diagnostic trouble code could be generated if the slotted ring mounted on the crankshaft has been damaged in connection with work carried out on the basic.engine, for instance.

Check The Wiring.
Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the wiring at several points and in different directions to ascertain whether the wiring harness, including any connectors, is causing the trouble. Observe the multimeter, ISAT scan tool or test lamp while doing this.





Diagnostic Procedure.
1 Check the resistance of the crankshaft position sensor

- Unplug the crankshaft position sensor's 4-pin connector.
- Take a resistance reading on the contacts of the sensor's connector, across:
^ pins 1 and 2: 860 ±9O ohms.
- Check for possible stray currents between the signal lead and the screening.
^ pins 1 and 3: OL infinite resistance (OL = OverLoad)

Are the resistance readings OK?

YES:
^ Continue with point 2.

NO:
^ Change the crankshaft position sensor. Continue with point 5.





2 Check the mounting of the crankshaft position sensor

- Remove the crankshaft position sensor and check:
^ that the sensor tip is not soiled with metal filings, swarf, etc.
^ that the slotted ring is firmly secured to the crankshaft (by prising it gently with a screw-driver).
^ while the crankshaft is rotated, that the slotted ring is not skew, buckled or otherwise damaged.
- Brush any metal filings, etc. off the sensor and change the engine oil,

Is the slotted ring damaged or insecurely mounted?

YES:
^ Check the basic engine.

NO:
^ Continue with point 3.

3 Check the electrical interface between the crankshaft position sensor and the control module

- Turn the ignition switch to the ON position.
- Connect the test lamp to the crankshaft position sensor's connector between:
^ Battery positive (B+) and pin 2
^ Battery positive (B+) and pin 3.
The test lamp should light up in both cases.
- Using a multimeter, take a reading between:
^ pin 1 and battery negative (B-).
Desired reading: about 1.8 V.

Is the reading OK?

YES:
^ Continue with point 4.

NO:
^ Repair or replace the relevant lead between:
- pin 2 and control module pin 43.
- pin 1 and control module pin 16.
- pin 3 and grounding point G7S.





4 Final check

- Clear the diagnostic trouble code.
- Implementation of driving cycle:
^ Drive the car at speeds above 50 km/h.
^ Rev up the engine to maximum rpm for at least 5 seconds.

- Evaluation of driving cycle:
^ Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?

YES:
^ Continue at "Before Replacing a Control Module". Component Tests and General Diagnostics

NO:
^ The steps taken to rectify the fault were correct.