Mazda MX-3 silhouetteMX-3

ANTI-LOCK BRAKE SYSTEM

P-67prose procedure

Check ABS relay harness (motor relay)

  1. 1
    Inspect the fail-safe relay.
  2. 2
    Turn the ignition switch OFF and disconnect the ABS control module connector (18 pin).
    ABS control module 18-pin connector terminal layout. Top row: 2S 2Q 2O 2M (X) 2G 2E 2C 2A; bottom row: 2T 2R 2P 2N 2L 2J 2H 2F 2D 2B.
  3. 3
    Turn the ignition switch ON.
  4. 4
    Connect terminal 2J to a ground.
  5. 5
    Connect terminal 2H to a ground.
  6. 6
    Check the following points:
    Allowing the motor to operate for more than two seconds will damage the ABS motor.
  7. 7
    If not as specified, replace the ABS relay.

Motor relay harness check

Motor relay in ABS relay does not click when terminals grounded
ActionCheck harness between motor relay and ABS control module; Check motor relay
ABS motor does not operate
ActionCheck motor relay; Check harness between motor relay and ABS motor; Check fuse

Check ABS relay (motor relay)

  1. 1
    Measure the resistance between terminals (e) and (h) or between (a) and (h) of ABS relay box connector.
    ABS relay internal schematic (motor relay) showing relay coils and contacts with terminals labeled b, d, 9, f, h, a, e, c. Below is the ABS relay connector terminal-position diagram with bottom row h g e d c a and top row f, b.
  2. 2
    Check continuity between terminals (b) and (f).
  3. 3
    Apply 12V to terminals (g) (+) and (h) (-). Check for continuity between terminals (b) and (f).
  4. 4
    If not as specified, replace the ABS relay.
Resistancebetween terminals (e)-(h) or (a)-(h)
50-90Ω

Continuity (no voltage applied)

b-f
ContinuityNo

Continuity (12V applied: g(+), h(-))

b-f
ContinuityYes
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