DRIVE
Input signal from the automatic transmission
Symptom of fault
Engine idling speed drops when the selector lever is moved away from P or
N.
Conditions
No diagnostic trouble codes.
Diagnostic procedure
1. Check the DRIVE function
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Connect an ISAT scan tool.
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Ignition switch in ON position.
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Move the selector lever from P and
N to another gear position to check for the presence of an input signal.
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Is the ISAT scan tool reading correct?
Change the idle air control valve and then continue with point 3.
Continue with point 2.
2. Check the DRIVE signal
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Remove the Trionic control
module.
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Ignition switch in ON
position.
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Connect the test lamp to pins 14
and 25 of the Trionic control module's connector.
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The test lamp should light up when the selector lever is in any position except P
and N.
Functionality OK?
Continue with point 3.
Check and if necessary repair or replace the lead between pin 14 of the
Trionic control module and pin 11 of the transmission control module. If the lead is OK,
continue fault diagnosis as described in Service Manual 4:2 "Automatic transmission". Then
continue with point 3.
3. Final check
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Perform a driving
cycle:
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Drive the car at varying engine
loads and rpm for 5 minutes.
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Car speed should exceed 20 km/h at some time during the driving
cycle.
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Stop the car, apply the handbrake and run the engine at idling
speed
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Switch off the A/C and all electrical equipment. If the car has automatic
transmission, select position P. Allow the engine to stabilize its idling speed for 10
sec.
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Switch on the A/C and all electrical equipment. If the car has automatic
transmission, select position D. Allow the engine to stabilize its idling speed for 10
sec.
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Evaluation of driving cycle: Check
whether diagnostic trouble codes P0505-P0507 have been
generated.
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Has any of the diagnostic trouble codes been generated?
Proceed to
.
The remedial measure taken was
correct.
