P0335

DIAGNOSTIC TROUBLE CODE P0335
Crankshaft position sensor, malfunctioning

Fault symptom
The engine tails to start or misfires.

NOTE: If pin 66 or pin 67 of the control module is not connected to ground, more diagnostic trouble codes will be generated.


Conditions.
The sensor reads the wrong number of ribs (teeth) per crankshaft revolution.

DIAGNOSTIC PROCEDURE

1. Checking The Resistance Of The Crankshaft Position Sensor
Unplug the crankshaft position sensor's 3-pin connector.

Take a resistance reading at the sensor connector:
- Check the resistance of the sensor across pins 1 and 2. Nominal resistance is 54O ±55 ohms.
- Check the resistance across pins 1 and 3 for stray currents between the signal lead and screened lead. The nominal resistance is infinite (OL).

If the readings are OK, continue with point 2.

If any reading is not OK, change the crankshaft position sensor.


2. Checking The Crankshaft Position Sensor Output
Crank the starter motor and take a voltage reading at the crankshaft position sensor output at the same time. Connect a voltmeter to pins 1 and 2 of the sensor's connector.

The voltmeter should show a reading of about 2 V AC and about 200 Hz.


If the reading is OK, continue with point 4.

If the reading is not OK, continue with point 3.





3. Checking The Mounting Of The Crankshaft Position Sensor
Remove the crankshaft position sensor and check
- That the sensor tip is not fouled with metal shavings, etc.
- That the perforated disc is firmly secured to the crankshaft by carefully prying it with a screwdriver.

Brush off any metal shavings, etc.

If no relevant cause of the fault can be found, change the crankshaft position sensor.

4. Checking The Electrical Interfaces Of The Crankshaft Position Sensor
Check the crankshaft position sensor's ground and screened lead connections.

Take voltage readings at the connector across:
- Battery positive and pin 2 12 V
- Battery positive and pin 3 12 V.

If the readings are OK, continue with point 5.

If any reading is not OK, take suitable action with regard to the lead concerned between:
- Pin 2 and crimped connection J68,
- Pin 3 and crimped connection J68.





5. Checking The Wiring
Check the lead between pin 1 and control module pin 41 for continuity, shorting and stray currents.

If the readings are OK, continue with point 6.

If the readings are not OK, rectify the fault.

6. Final Check
Clear the diagnostic trouble code, drive the car on test and check whether the trouble code is generated afresh.

If the DTC is generated again, refer to Before Replacing A Control Module.

If the DTC is not generated again, the action taken to rectify the fault was correct, otherwise the fault is of intermittent nature.