900 SE Convertible V6-2498cc 2.5L DOHC (1995)
BEFORE CONTROL MODULE REPLACEMENT
When all tests have been carried out according to the relevant diagnostics procedure or by manual fault diagnosis without any faults having been
found, it is natural to assume that the control module is at fault.
In view of the fact that the control module is an exceptionally high-quality component and also extremely expensive, it is important to verify the
diagnosis as far as possible.
Therefore, go through all the points very carefully before definitely pointing to the MOTRONIC control module as the cause of the fault.
1. Check once again that every single point in the fault diagnosis program of the relevant diagnostic trouble code has been carried out.
2. Study the wiring diagram of the circuit in question and make sure you understand how it works. Relevant parts of the technical description and
the electrical descriptions of operation may be of assistance in this respect.
3. Check all grounding points. If you have already done so, do it once again. Check that power ground and signal ground are electrically separate.
4. Check the voltage supplied to the control module.
5. Go once more through each point listed under "Points to Note when Diagnosing Faults" at "Diagnostic Charts/DTC Charts".
6. If the original fault still persists in spite of this, then the MOTRONIC control module will have to be replaced.
