TTS Quattro Roadster L4-2.0L Turbo (CDMA) (2009)
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check
Start diagnosis
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Disconnect the Data Bus On Board Diagnostic Interface (J533) electrical harness connector.
‹› The Motronic Engine Control Module (ECM) (J623) must remain connected for the following step.
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Using a multimeter, check the Data Bus On Board Diagnostic Interface (J533) electrical harness connector terminals 6 to 16 for resistance.
Specified value: 60 to 72 ohms (at approx. 20° C)
If the specified value was not obtained:
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Check the wiring for a short circuit to Battery (+), or an open circuit.
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
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Replace the Motronic Engine Control Module (ECM) (J623).
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623).
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Using a multimeter, check the Data Bus On Board Diagnostic Interface (J533) electrical harness connector to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T94 for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the wiring for a short circuit to Battery (+), or an open circuit.
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
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Replace the Data Bus On Board Diagnostic Interface (J533).
Final procedures
After the repair work, the following work steps must be performed in the following sequence: