Important Information (Read First)

NOTE: If system faults develop, the main relay switches off all power supply to the Electronic Control Unit (ECU) and valves.

1. The diagnostic socket, which is green, is located under the right-hand front seat.
2. The ignition key must always be in the Drive position when diagnostic work is being carried out.
3. The Antilock Brake System (ABS) system has system number 3 in the ISAT.
4. Read and note all stored trouble codes before disconnecting the battery or ECU.
5. If it is not possible to establish a connection between the ISAT and the ECU, first check the wires between pins 23 and 42 of the ECU and the diagnostic socket (348). Check also that the supply current and earth are present in the diagnostic socket and that the pins of the connector are not damaged.
6. The actual diagnosis has been completed when the contents of the system's fault memory have been transferred to and stored in the ISAT. The faults are now available in the form of five-figure trouble codes, after which fault-tracing work can be continued according to the fault-diagnosis routine for the system concerned.
7. To avoid the risk of damaging the ECU, always check that the ignition is turned off before removing the connector.
8. When carrying out fault-tracing work on the vehicle's electronic systems, it is advisable to check first that the earth connection of the ECU concerned is good and that all the supply voltages are correct.
9. Remove the connectors and check that the connections and pins are undamaged. Replace the connectors and delete all trouble codes. Start/ drive the car again and check whether the fault(s) persist(s).
10. When it is first detected, each fault is given an trouble code corresponding to a continuous fault. If the fault disappears again, the fault is given an intermittent trouble code instead.
11. All signals around the 12 V level are proportional to battery voltage, and the levels are therefore only to be used as a guide.
12. All signals designate earth, but on a sensitive multimeter may produce a reading slightly above 0 V.

NOTE: If command codes are used as a check at the same time as the car is being driven, remember that contact between the ISAT and the ECU will be broken when the car is driven at a speed above 20 km/h.