No communication with Motronic

Read the instructions below then start the fault diagnostic procedure.

Symptom: No communication with Motronic

No communication with Motronic

Fault symptoms

No communication with Motronic

Conditions

The following conditions are applicable:

•	Ignition switch in ON position

Diagnostic help

First, check the fuses for the Motronic control module and that the data link connector pins for communication are in place.

Then, check whether the Motronic control module is awake and allowing diagnostics communication. If not, check to see if the diagnostic tool works in another car.

If no fault is found, rectify the communications lead between the Motronic control module and the data link connector.

Check wiring harness.

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.