ECM Check

When all test have been accomplished according to the diagnostic procedure with the relevant diagnostic trouble codes or by manual fault tracing without any trace of fault being discovered, it is natural to assume that the electronic control module is faulty.

Go through the following points before you definitely determine the electronic control module has the fault cause.

1 Once again check all the points in the relevant diagnostic procedure program have been carried our in the right way.

2 Study the particular circuit wiring diagram and familiarize yourself with its operations.

3 Observe caution when removing/fitting the electronic control module as it id sensitive to electrostatic discharge, Handling the Electronic Control Module

4 Once again test the voltage supply to the electronic control module and all grounding points.

5 Experience from M93-M95 shows that 80% of all electronic control modules returned in connection with the warranty agreement are without fault. Be reluctant when deciding to change an electronic control module! Incorrect replacement of electronic control modules contribute a high cost to Saab Automobile and their dealers. Think through all possible fault causes before changing the electronic control module.

6 If the original fault persists, the electronic control module must be changed.