ABS Main Relay: Testing and Inspection

CONTROL RELAY INSPECTION

Inspect Continuity Of Motor Relay Circuit:

1. Inspect continuity of Motor Relay circuit.
(a) Check there is continuity between terminals 3 and 4.
(b) Check there is no continuity between terminals 1 and 2.
If continuity is not as specified, replace the relay.

Inspect Operation Of Motor Relay Circuit:

2. Inspect operation of Motor Relay circuit.
(a) Connect the positive (+) lead from the battery to terminal 3 and negative (-) lead to terminal 4.
(b) Check there is continuity between terminals 1 and 2. If operation is not as specified, replace the relay.

Inspect Continuity Of Solenoid Relay Circuit:

3. Inspect continuity of Solenoid Relay circuit.
(a) Check there is continuity between terminals 1 and 6.
(b) Check there is no continuity between terminals 2 and 5.
(c) Check there is continuity between terminals 3 and 5.

Inspect Continuity Between Terminals 4 And 5:

(d) Connect the positive lead from the ohmmeter to terminal 5 and connect negative lead to terminal 4.
(e) Check there is continuity between terminals.
(f) Connect the 2 leads in reverse, and check there is no continuity between terminals.
If continuity is not as specified, replace the relay.

NOTE: For the different type ohmmeter, there is no continuity for step (d), and there is continuity for step (e).

Inspect Operation Of Solenoid Relay Circuit:

4. Inspect operation of Solenoid Relay circuit.
(a) Connect the positive (+) lead from the battery to terminal 1 and negative ( - ) lead to terminal 6.
(b) Check there is continuity between terminals 2 and 5.
(c) Check there is no continuity between terminals 3 and 5.
If operation is not as specified, replace the relay.