P0342,P0343
Symptom: Engine performance down
Camshaft position sensor, input to control module
low/high, no continuity or shorting to ground/batt<>
Fault symptom
Engine performance down
1.
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Use the ISAT command
"CAMSHAFT SENSOR ACTIVE" in the "READ
ON/OFF" menu. With the ignition switched on, the ISAT should show
"NO", with the engine running it should show "YES". If this is
OK, proceed to point 6. If not, continue with the next point.
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2.
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With the ignition switch in the Drive position, check whether
voltage is present on pin 1 of the sensor connector (12 V). Also check
that the ground connection on pin 3 is OK.
If it is not, check the lead between pin 1 of the
connector and pin 87 of the main relay for continuity/shorting. Also
check the lead between pin 3 of the connector and grounding point G7S
for continuity/shorting to +12 V.
If voltage and grounding in the connector are OK,
continue with point 3.
If no voltage is present and the wiring is OK, proceed to point 6.
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3.
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With the ignition switched off, connect a BOB. Do not forget to
plug in the camshaft sensor's connector.
Warning
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Before turning the engine over, unplug the four-pin connector from the
ignition coil module to prevent the engine from starting.
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Turn the ignition switch to the Drive position,
turn the engine over and take a reading across pins 8 and 14 to check
whether the voltage varies between 0 and 5 V (5 V when the camshaft
sprocket's "pimple" passes the Hall-effect sensor).
Start the engine and run it at idling speed. Repeat the above
test. A reading of about 4.5 V should now be obtained across pins 8 and
14.
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4.
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It incorrect readings are obtained in the above tests, take a
reading across pin 8 (on the BOB) and pin 2 of the camshaft position
sensor's connector to check the wiring for continuity/shorting.
Also check that the clearance between the Hall-
effect sensor and the camshaft sprocket's "pimple" is not more than
1.5 mm.
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5.
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If voltage is present on pin 1 of the sensor's connector and pin 3
is properly grounded, but no voltage reading was obtained when carrying
out the test in point 2, change the Hall-effect sensor.
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6.
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If no fault can be detected after carrying out the above checking
procedure, clear the trouble code and drive the car on the road to
check whether the trouble code is generated afresh. If it is, turn to
for further diagnostic instructions.
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