1997 MITSUBISHI TRITON brake

ABS <2WD> ± Troubleshooting35B-18
Inspection Procedure 7
Brake operation is abnormal.
Probable cause
This varies depending on the driving conditions and the road surface conditions, so
problem diagnosis is difficult. However, if a normal diagnosis code is displayed, carry
out the following inspection.
Improper installation of wheel speed sensor

Incorrect sensor harness contact

Foreign material adhering to wheel speed sensor

Malfunction of wheel speed sensor

Malfunction of rotor

Malfunction of wheel bearing

Malfunction of hydraulic unit

Malfunction of ABS-ECU
OK
Check trouble symptom.NGReplace the ABS-ECU.
OK
Check the following connector.
C-62NG
Repair
NG
Measure at ABS-ECU connector C-62.

Disconnect the connector and
measure at the harness side.

Resistance value between terminals
10-23, 7-20, 8-21 and 9-22
OK:1.2 ± 1.4 kW
(The sensor harness and connector
should be moved while these
inspections are carried out.)NG
Repair
OK
Check trouble symptom.
OK
Check the following connectors.
A-01, A-07, F-01, F-16, D-01, and C-02NG
Repair
OK
Wheel bearing check. (Refer to GROUP
26 and 27 ± On-vehicle Service.)NG
Repair
OK
Rotor check. (Refer to P.35B-40.)NGReplace the rotor.
OK
Hydraulic unit check. (Refer to P.
35B-26.)
OK
Wheel speed sensor output voltage
check. (Refer to P. 35B-24.)NGWheel speed sensor check. (Refer to
P. 35B-39.)NGReplace the wheel speed sensor.
Wheel speed sensor installation check.NG
Repair

35C-2
For the items below, refer to GROUP
35A.
SEALANTS
ON-VEHICLE SERVICE
Brake Pedal Check and Adjustment
Stop Lamp Switch Inspection
Brake Booster Operating Test
Check Valve Operation Check
Brake Booster Vacuum Switch Check
Load Sensing Spring Length Check and
Adjustment
Load Sensing Proportioning Valve Function
Test
Front Disc Brake Rotor Check
Brake Lining Thickness Check
Brake Drum Inside Diameter Check
Brake Lining and Brake Drum Connection
Check
BRAKE PEDAL
LOAD SENSING PROPORTIONING VALVE
REAR DRUM BRAKE
For the items below, refer to GROUP
35B.
ON-VEHICLE SERVICE
Bleeding
Disc Brake Pad Check and Replacement
Wheel Speed Sensor Output Voltage Check
Hydraulic Unit Check
Solenoid Valve Check
Motor Operation Check
Motor Relay and Valve Relay Continuity Check
Remedy for a Flat Battery
MASTER CYLINDER AND BRAKE
BOOSTER
HYDRAULIC UNIT
ABS-ECU

ABS <4WD> ± Troubleshooting35C-5
TROUBLESHOOTING35101110143
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 ± How to Use Troubleshooting/Inspection Service Points.
NOTES WITH REGARD TO DIAGNOSIS
The phenomena listed in the following table are not abnormal.
PhenomenonExplanation of phenomenon
System check soundWhen starting the engine, a thudding sound can sometimes be heard coming from inside
the engine compartment, but this is because the system operation check is being
performed, and is not an abnormality.
ABS operation sound1. Sound of the motor inside the ABS hydraulic unit operation. (whine)
2. Sound is the generated along with vibration of the brake pedal. (scraping)
3. When ABS operates, sound is generated from the vehicle chassis due to repeated
brake application and release.
(Thump: suspension; squeak: tyres)
ABS operation
(Long braking distance)For road surfaces such as snow-covered roads and gravel roads, the braking distance for
vehicles with ABS can sometimes be longer than that for other vehicles. Accordingly, advise
the customer to drive safely on such roads by lowering the vehicle speed and not being too
overconfident.
Shock during system
operation checkShock may be felt when the brake pedal is depressed slightly at a low driving speed. This
occurs due to ABS operation check (check at a vehicle speed of 8 km/h after starting), and
does not indicate any malfunction.
Diagnosis detection condition can vary depending on the diagnosis code.
Make sure that checking requirements listed in the ªCommentº are satisfied when checking the trouble
symptom again.
DIAGNOSIS FUNCTION35201120108
DIAGNOSIS CODES CHECK
Read a diagnosis code by the MUT-II or ABS warning lamp.
(Refer to GROUP 00 ± How to Use Troubleshooting/Inspection
Service Points.)
ERASING DIAGNOSIS CODES
Refer to GROUP 00 ± How to Use Troubleshooting/Inspection
Service Points.

ABS <4WD> ± Troubleshooting35C-11
DATA LIST REFERENCE TABLE35201150107
The following items can be read by the MUT-II from the ABS-ECU input data.
1. When the system is normal
Item No.Check itemChecking requirementsNormal value
11Front-right wheel speed sensorPerform a test runVehicle speeds
displayed on the12Front-left wheel speed sensor
dis layed on the
speedometer
and MUTIIare13Rear-right wheel speed sensorand MUT-II are
identical.
14Rear-left wheel speed sensor
16ABS-ECU power supply
voltageIgnition switch power supply voltage and valve
monitor voltage9 ± 16 V
25Free wheel engage switchEngage 4WDON
Engage 2WDOFF
264WD detection switchPlace the transfer lever at 4H.ON
Place the transfer lever at 2H.OFF
27Rear differential lock detection
switch
Turn on the switch.ON
switch
Turn off the switch.OFF
32G-sensor output voltageStop the vehicle.2.4 ± 2.6 V
Perform a test run.Display value
fluctuates with a
mean value of
2.5 V.
33Stop lamp switchDepress the brake pedal.ON
Release the brake pedal.OFF
2. When the ABS-ECU shut off ABS operation.
When the diagnosis system stops the ABS-ECU, the MUT-II display data will be unreliable.
ACTUATOR TEST INSPECTION TABLE35201160056
Refer to GROUP 35B ± Troubleshooting.

54-3
REAR WINDOW DEFOGGER 83. . . . . . .
SPECIAL TOOL 83. . . . . . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 83. . . . . . . . . . . . . . . . .
Printed-heater Line Check 83. . . . . . . . . . . . . . . .
REAR WINDOW DEFOGGER SWITCH 84. . .
RADIATOR FAN MOTOR
Refer to GROUP 14 . . . . . . . . . . . . . . . . . . .
INTERCOOLER (INTERCOOLER FAN
MOTOR) Refer to GROUP 15. . . . . . . . . .
REAR DIFFERENTIAL LOCK
Refer to GROUP 27 . . . . . . . . . . . . . . . . . . .
SERVICE BRAKES (ABS)
Refer to GROUP 35B, 35C . . . . . . . . . . . .
DOOR GLASS AND REGULATOR
(POWER WINDOWS)
Refer to GROUP 42 . . . . . . . . . . . . . . . . . . . DOOR HANDLE AND LATCH (DOOR
LOCKING) Refer to GROUP 42. . . . . . . .
WINDSHIELD WIPER AND WASHER
Refer to GROUP 51 . . . . . . . . . . . . . . . . . . .
HEADLAMP WASHER
Refer to GROUP 51 . . . . . . . . . . . . . . . . . . .
DOOR MIRROR (ELECTRONIC
CONTROLLED DOOR MIRROR)
Refer to GROUP 51 . . . . . . . . . . . . . . . . . . .
FRONT SEAT (HEATED SEAT)
Refer to GROUP 52A . . . . . . . . . . . . . . . . .
SRS AIR BAG
Refer to GROUP 52B . . . . . . . . . . . . . . . . .
HEATER Refer to GROUP 55. . . . . . . . . .
AIR CONDITIONER
Refer to GROUP 55 . . . . . . . . . . . . . . . . . . .

3
TROUBLESHOOTING35201110129
STANDARD FOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.
NOTES WITH REGARD TO DIAGNOSIS
The phenomena listed in the following table are not abnormal.
Phenomenon Explanation of phenomenon
System check sound When starting the engine, a thudding sound can sometimes
be heard coming from inside the engine compartment, but
this is because the system operation check is being
performed, and is not an abnormality.
ABS operation sound Sound of the motor inside the ABS hydraulic unit operation.
(whine)
Sound is the generated along with vibration of the brak
pedal. (Scraping).
When ABS operates, sound is generated from the vehicle
chassis due to repeated brake application and release.
(Thump: suspension; squeak: tyres)
ABS operation (Long braking distance) For road surfaces such as snow-covered roads and gravel
roads, the braking distance for vehicles with ABS can
sometimes be longer than that for other vehicles.
Accordingly, advise the customer to drive safely on suc
roads by lowering the vehicle speed and not being too
overconfident.
Diagnosis detection condition can vary depending on the diagnosis code.
Make sure that checking requirements listed in the “Comment” are satisfied when checking the trouble
symptom again.
DIAGNOSIS FUNCTION 35201120106
DIAGNOSIS CODES CHECK
Read a diagnosis code by the MUT-II or ABS
warning lamp. (Refer to GROUP 00 – How to Use
Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES

Refer to GROUP 00 – How to Use
Troubleshooting/Inspection Service Points.

See next page.
ABS <2WD> - Troubleshooting35B-6

5
4.
Remedy the malfunctions indicated by th
diagnosis codes, disconnect the diagnosis code
check harness, and then install the valve relay.
Then turn the ignition switch to ON again t
check the ABS warning lamp. (Refer to P.35-36-
16.) If the lamp indicates a malfunction, th
valve relay system may be detective. (Refer to
P.35-36-14.)
ERASING DIAGNOSIS CODES
With the MUT-II
Connect the MUT-II to the diagnosis connector (16-
pin), and then erase the diagnosis codes.
Without the MUT-II
Remove the battery cable from the battery (-)
terminal for 10 seconds or more, and the
reconnect the cable.
See next page.
SERVICEBRAKES – ABS Troubleshooting 35-36-4

9
TROUBLESHOOTING35201110501
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points
NOTES WITH REGARD TO DIAGNOSIS
The Phenomena listed in the following table are not abnormal.
Phenomenon Explanation of phenomenon
System check sound When starting the engine, a thudding sound can sometimes be hear
coming from inside the engine compartment, but this is because the
system operation check is being performed, and is not an abnormality.
ABS operation sound 1.
Sound of the motor inside the ABS hydraulic unit operation (whine).
2.
Sound is generated along with vibration of the brake pedal (scraping)
3.
When ABS operates, sound is generated from the vehicle chassis
due to repeated brake application and release.
(Thump: suspension: squeak: tyres)
ABS operation (Long braking
distance)For road surfaces suck as snow-covered roads a gravel roads, the
braking distance for vehicles with ABS can sometimes be longer than
that for other vehicles. Accordingly, advise the customer to drive safely
on suck roads by lowering the vehicle speed and not being to
overconfident.
Diagnosis detection condition can vary depending on the diagnosis code.
Make sure that checking requirements listed in the “Comment” are satisfied when checking the trouble
symptom again.
DIAGNOSIS FUNCTION35201120351
DIAGNOSIS CODES CHECK
Read a diagnosis code by the MUT-II or ABS warning
lamp. (Refer to GROUP 00 - How to Use Trouble-
shooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES
With the MUT-II
Refer to GROUP 00 – How to Use
Troubleshooting/Inspection Service Points

When diagnostic trouble codes (Nos. 21 to 24) (for vehicle wheel speed sensor system failures) occur,
normal MUT-II operation may not erase those codes. In that case, erase the diagnostic trouble codes
using the following procedures.
1.
Perform erasing of the diagnostic trouble codes by special operation of the brake pedal. (See erasing
procedure for the diagnostic trouble codes without use of the MUT-II.)
2.
Turn the ignition switch OFF.
3.
Perform erasing of the diagnostic trouble codes by use of the MUT-II.
ABS <4WD> - Troubleshooting35B-4
><