Section 9 (Anti-Lock Brake System): Testing: Notes

WARNING: This page is about a different car, the 1989 Volvo 760 and 1989 Volvo 740. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Electronic Control Unit (ECU) for ABS system is an extremely reliable component. Prior to replacing ECU all other system components and related wiring should be tested.

To prepare for testing, turn ignition switch to the "OFF" position. Remove cover from hydraulic modulator. Remove connector from ECU by depressing lock spring and swinging out connector. Unless otherwise stated in testing procedures, ECU connector is to remain unplugged. Consult wiring diagram while performing tests. Check ECU Connector terminals through holes in side connector using minimum force. Connector terminal numbers are molded into side of connector. To reduce diagnostic time, test components in order given.