Diagnostic connector position

Diagnostic connector position

Self-diagnosis function

The ECU has a built in self-diagnosis function. If a fault is detected, the ABS system will not operate, and the ABS warning light will illuminate and stay on until the starter switch is turned off. If the fault is still present when the starter switch is switched on, the warning light will stay illuminated. If the fault is not detected the warning light will extinguish, but a fault code will be stored in the ECU memory. The fault is deleted from memory if it is not detected again during the next 20 times the ignition is turned on.

To access the ECU memory to obtain the fault code firstly gain access to the serial link diagnostic connector which is situated under the drivers side of the fascia. Disconnect bridging connector for access to diagnostic connector.

Turn off the starter switch, bridge the Y/G wire to the B wire, turn on the starter switch. The ABS warning light will now commence a sequence of flashes. Firstly it will initiate the start identification by flashing the code ’1-2’ three times in succession. Then after a 3 second pause the fault code will be flashed three times in succession. Up to three separate fault codes may be stored at one time.

The first digit of the code is shown by the warning light flashing a number of times in succession, then after a 1 second pause the warning light flashes again to give the second digit of the code.

For example: Code ’2-5’. The warning light will flash twice in succession then after a 1 second pause will give a further 5 flashes.