P0340

CAMSHAFT POSITION





Symptom Of Fault.
The CHECK ENGINE lamp (MIL) is on.

Conditions.
Engine running.
More than 5000 engine revolutions since starting.
No camshaft position signal.

Diagnostic Help.
The cause of the fault could be:
^ incorrect or defective spark plugs
- wrong type
- sooty
- damaged
^ fault in wiring harness
- an open circuit in one of the leads connected to pin 17 or 18 of the control module
^ severe misfiring





Diagnostic Procedure.
1. Check additional diagnostic trouble codes in the Trionic system
- Obtain readouts of all diagnostic trouble codes using the ISAT scan tool.
^ P0105-P0135
^ P0170-P0172
^ P0300-P0304
^ P0335
^ P0441-P0445
^ P1170-P1172

Are any of the above diagnostic trouble codes present?
YES:
^ Continue fault diagnosis as described for the appropriate diagnostic trouble code.
NO:
^ Continue with point 2.





2. Check the ignition discharge module's connections
- Unplug the ignition discharge module's 10-pin connector.
- Ignition switch in ON position.
- Take voltage readings on the female connector sockets
pin 8 to battery negative (B - +
pin 9 to battery negative (B - +
The readings obtained should be about 10 V.

Are the readings OK?
YES:
^ Change the spark plugs and continue with point 3.
NO:
^ Rectify the lead in question and proceed to point 3.





3. Final check:
- Clear the diagnostic trouble code.
- Implementation of driving cycle:
^ Run the engine at idling speed until the radiator fan starts, then switch off the engine.
^ Start the engine and run it at idling speed for 6 minutes.
- Evaluation of the driving cycle:
Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?
YES:
^ Try fitting a replacement ignition discharge module and, after a repetition of the driving cycle, check whether the diagnostic trouble code is generated afresh.
NO:
^ The remedial measure taken was correct.

Is the diagnostic trouble code generated afresh after the ignition discharge module has been changed?
YES:
^ Refit the original ignition discharge module and then continue at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO:
^ Scrap the original ignition discharge module. The remedial measure taken was correct.