Guidelines

TO REMEMBER DURING FAULT-TRACING
It is not possible to give any general rules on how fault-tracing should be carried out in every individual case. Depending on fault symptoms and other available information one method could be suitable in a certain situation only to be less suitable in another.

The following points may, however, serve as guidelines in connection with fault-tracing in the automatic transmission and it not a bad idea to remind yourself of this information from time to time during fault-tracing.

1. Always start fault-tracing by reading any fault codes with ISAT scan tool.

Certain fault-tracing procedures mean that connectors are disconnected while the ignition remains switched on. This results in fault codes. Therefore always clear any fault codes when you have finished the job.

2. Check fuses 9, 17 and 34.

3. Check connectors, especially as regards oxidized contact pins, play or anything which could impair the conductivity. If you suspect a contact problem, use contact spray KONTAKT 61 (Part No 45 300 45 20) on female contacts in connectors.

4. Before you connect a Break Out Box (BOB), check the power supply to pins 17 and 18 and that there is sufficient ground on pins 22 and 35.

5. Check if CHECK GEARBOX or any other warning lamp is on.

Diagnostic trouble codes for the automatic transmission could be follow-on faults which are automatically corrected when the primary reason has been eliminated.