Mitsubishi 1989-1993 GALANT Service Manual page 1190

SERVICE BRAKES
oscilloscope's waveform is 70 mV or lower
Probable causes
Excessive clearance between the speed sensor pole
piece and rotor
Foreign material attached to the speed sensor pole
piece
Damaged speed sensor pole piece
Damaged rotor teeth
Loose speed sensor or rotor installation bolt
NOTE
The speed sensor internal resistance and harness side are normal.
Caution
It is conceivable, because the movement of a speed-sensor cable "follows" the movement of the front
or rear suspension, that the damaged wiring condition may be apparent only during travel on poor
road surfaces, and may be normal on better road surfaces. Therefore, when measuring the output
voltage of a speed sensor, recheck the condition of the cable connections by removing the clamp and
pulling the cable and bending it near the clamp position in order to check for the existence of damaged
wiring.
Check connector
Body harness
Adjust to the standard value.
Remove the foreign material.
Replace the speed sensor.
Replace the rotor.
I Tighten to the specified torque.
MEASUREMENT OF WHEEL SPEED SENSOR
OUTPUT VOLTAGE <From 1991 models>
1. Lift up the vehicle and release the parking brake.
2. Disconnect the ECU harness connector and measure with
the adapter harness (MB991 356) connected to the harness
side connector.
ECU
Caution
1. Never insert a probe, etc. into the connector as it
may result in poor contact later.
2. Do not connect the connector (Special Tool) marked
with u*n except when recording the waveform on a
driving test. In such a case, connect the connector
to the ECU.
Terminal No. (same for AWD and FWD)
FL
4
5
TSB Revision
Remedy
FR
RR
24 21
23 .
26
RL
8
9