Throttle position signal
Output signal to automatic transmission
Fault symptoms
CHECK ENGINE lamp (MIL) on. CHECK GEARBOX lamp on.
Conditions
Diagnostic trouble code: P1624 Motronic 4.1, control module
Diagnostic trouble code: P1785 Transmission control module (TCM).
Diagnostic procedure
1. Check the wiring
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Remove the Motronic control
module and the transmission control module.
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Check for continuity in the lead
between:
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Check the lead for open circuit and
shorting.
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Is the lead OK?
Continue with point 2.
Rectify the fault. Continue with point 3.
2. Check the output signal
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Plug in the Motronic control
module.
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Turn the ignition switch to the ON
position.
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Take a reading of the frequency on
the connector for the transmission control module, between
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The frequency should be 100 Hz.
Are the temperature readings OK?
Continue with point 3.
Continue as described in
.
3. Final check
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Clear the diagnostic trouble
codes.
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Implementation of driving cycle:
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Evaluation of driving cycle:
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Has the diagnostic trouble code recurred?
Continue fault diagnosis as described in Service Manual 4:2 "Automatic
transmission".
The steps taken to rectify the fault were correct.
