Mitsubishi 1989-1993 GALANT Service Manual page 1169

SERVICE BRAKES
When diagnostic trouble code "21 G SENSOR" is displayed
[Explanation]
The ABS ECU outputs this diagnostic trouble code
in the following cases.
OFF trouble turning G sensor OFF (It is judged
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that the G sensor continues to be OFF for more
than approximately 13 seconds except when the
MAIN FUSIBLE
IGNITION
LINK @
SWITCH (IG2)
ABS
POWER
RELAY
G-SENSOR
q
ABS
ECU
vehicle is stopped or when there is stop light
switch input.
When there is a broken wire or short circuit in
l
the harness for the G sensor system.
Is G sensor normal?
(Refer to P.35-132.)
Yes
Remove the ABS ECU
connector and check at
the harness connector.
With the ignition key "ON"
does voltage between
the
terminal No.6 and ground
indicate battery voltage?
Yes
No
Replace G sensor.
ECU is broken.
Repair harness.
Replace ABS ECU.
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