P0335

CRANKSHAFT POSITION SENSOR





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

NOTE: More diagnostic trouble codes will be generated if pin 67 of the control module is not connected to ground.

Conditions.
Vehicle speed >30 km/h Engine speed >1500 rpm. Brakes not applied. The sensor reads an incorrect number of ribs (teeth) per crankshaft revolution.

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

In the event of a complete functional breakdown, the engine will not start and the diagnostic trouble code cannot be generated.

If the perforated ring, which is mounted on the crankshaft, has been damaged in connection with work carried out on the basic engine, for instance, the diagnostic trouble code may be generated.

Checking The Wiring
Intermittent faults may occur as a result of occasional short circuits and breaks in the wiring. Jiggle the leads and in-line connectors at several places and in different directions to reveal faults in the wiring harness. Observe the multimeter, ISAT scan tool or test lamp while carrying out this check.





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

- Unplug the crankshaft position sensor's 3-pin connector.

- Take a resistance reading on the pins of the sensor's connector: Check the resistance of the sensor across pins 1 and 2.

Nominal resistance is 540 Mohms.

- Check for possible stray currents between the signal lead and screening across pins 1 and 3.

Nominal resistance is infinite (0L = OverLoad).

Are the resistance readings OK?
YES: Continue with point 2.
NO: Change the crankshaft position sensor and 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 perforated ring is firmly secured to the crankshaft (prising it gently with a screwdriver).
^ while the crankshaft is rotated, that the perforated ring is not buckled or damaged. Brush off any metal shavings or swarf on the sensor.

Is the perforated ring damaged or insecurely mounted?
YES: Continue in the Basic Engine.
NO: Continue with point 3.





3. Check the crankshaft position sensor's ground and screening connections

- Connect the test lamp to:

^ Battery positive (B+) and pin 2.
^ Battery positive (B+) and pin 3.

Does the test lamp light up in both cases?
YES: Continue with point 4.
NO: Repair or replace the appropriate lead between:

^ pin 2 and crimped connection J68
^ pin 3 and crimped connection J68.
Then continue with point 5.





4. Check the control module sensor input

- Check the lead between pin 1 of the connector and pin 41 of the control module.

Is the lead OK?
YES: Change the crankshaft position sensor and then continue with point 5.
NO: Repair or replace the lead and then continue with point 5.





5. Final check:

- Clear the diagnostic trouble code.
- Implementation of driving cycle:

^ Drive the car at a higher speed than 50 km/h.
^ Rev up the engine to maximum rpm for at least 5 seconds without touching the brake pedal.

- 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 remedial measure taken was correct.