wheel MITSUBISHI TRITON 1997 Owner's Manual

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

O
pera tio n J
u dgem ent
± N orm al J
u dgem ent
± A bnorm al P
ro bable c a use R
em edy 0
1 (
1 ) Depre ss b ra ke p edal
t o lo ck w heel.
( 2 ) Usin g th e M UT-I I , s
e le ct th e wheel to be B
ra ke fo rc e
r e le ase d fo r
4 s e co nds a
fte r lo ckin g W
heel d oes n ot
l o ck w hen b ra ke
p edal is d epre sse d. C
lo gged b ra ke lin e
o th er th an h yd ra ulic
u nit C
heck a nd c le an
b ra ke lin e 0
2 s
e le ct t
h e w
heel t
o b
e w
heel manually to a
fte r l
o ckin g C
lo gged h yd ra ulic
c ir c u it in h yd ra ulic
u nit R
epla ce h yd ra ulic
u nit a sse m bly 0
3 w
heel m
anually t
o B
ra ke fo rc e is n ot
r e le ase d I
n co rre ct h yd ra ulic
u nit b ra ke tu be
c o nnectio n C
onnect c o rre ctly H
yd ra ulic u nit
s o le noid v a lv e n ot
f u nctio nin g c o rre ctly R
epla ce h yd ra ulic
u nit a sse m bly M
easu re m ent
t e rm in als R
esis ta nce b etw een
t e rm in als . F
ro nt IN ( rig ht s id e) 1
± 5 o r 1 0 5
.0 W 2
± 5 o r 1 0 R
ear IN 3
± 5 o r 1 0 F
ro nt O UT ( rig ht s id e) 6
± 5 o r 1 0 2
.2 W 7
± 5 o r 1 0 R
ear O UT 8
± 5 o r 1 0

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-6
INSPECTION CHART FOR DIAGNOSIS CODES35201130163
Inspect according to the inspection chart that is appropriate for the malfunction code.
Diagnosis
code No.Inspection itemDiagnosis contentReference page
11Front right wheel speed sensorOpen or short circuitRefer to GROUP 35B ± Troubleshooting.
12Front left wheel speed sensor
13Rear right wheel speed sensor
14Rear left wheel speed sensor
15Wheel speed sensorAbnormal output signalRefer to GROUP 35B ± Troubleshooting.
16Power supply systemRefer to GROUP 35B ± Troubleshooting.
21Front right wheel speed sensorAbnormalRefer to GROUP 35B ± Troubleshooting.
22Front left wheel speed sensor
23Rear right wheel speed sensor
24Rear left wheel speed sensor
25Free wheel engage switch35C-7
264WD position detection switch35C-8
27Rear differential lock detection switch35C-9
32G-sensor system35C-10
33Stop lamp switch systemRefer to GROUP 35B ± Troubleshooting.
41Front right solenoid valveRefer to GROUP 35B ± Troubleshooting.
42Front left solenoid valve
43Rear solenoid valve
51Valve relayRefer to GROUP 35B ± Troubleshooting.
53Motor relay, motorRefer to GROUP 35B ± Troubleshooting.
63ABS-ECURefer to GROUP 35B ± ABS-ECU.
(Replace the ABS-ECU )
64
(Re lace the ABS-ECU.)

ABS <4WD> ± Troubleshooting35C-7
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODES
For diagnosis code numbers other than those listed below, refer to GROUP 35B ± Troubleshooting.
Code No. 25 Free wheel engage switch
Probable cause
ABS-ECU determines that an open circuit exists in the free wheel engage switch
system.
Malfunction of wiring harness or connector

Malfunction of 4WD indicator-ECU

Malfunction of ABS-ECU
Does the 4WD indicator lamp operate
normally?No4WD indicator-ECU check. (Refer to
GROUP 22 ± 4WD indicator-ECU.)NGReplace the 4WD indicator-ECU.
Ye s
Measure at ABS-ECU connector C-64.

Disconnect the connector and
measure at the harness side.

Ignition switch ON

Voltage between 45 and body earth
OK:System voltage 2WD> or 0 V NGCheck the following connectors.
C-64 and A-02NG
Repair
OK
Check trouble symptom.NGCheck the harness between free wheel
engage switch and the ABS-ECU, and
repair if necessary.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptom.NGReplace the ABS-ECU.

ABS <4WD> ± Troubleshooting35C-8
Code No. 26 4WD position detection switchProbable cause
This code is output at the following times:
ABS-ECU determines that an open circuit exists in the 4WD detection switch system.
The free wheel engage switch is off and the 4WD detection switch is on at a vehicle
speed of 15km/h or more for 5 seconds or more.
Malfunction of wiring harness or connector

Malfunction of free wheel engage switch

Malfunction of 4WD indicator-ECU

Malfunction of 4WD position detection switch

Malfunction of ABS-ECU
No
OK
Check trouble symptom.NGCheck the harnesses between 4WD
position detection switch and the ABS-
ECU, and repair if necessary.
OKCheck the following connector.
C-64NG
Repair
OK
Check trouble symptom.NGReplace the ABS-ECU.
Ye s
Measure at ABS-ECU connec-
tor C-64.

Disconnect the connector
and measure at the harness
side.

Ignition switch ON

Transfer lever:2H

Voltage between 35 and
body earth
OK:System voltageNGCheck the following connector.
C-64NG
Repair
Does the 4WD indicator lamp operate
normally?
Trouble symptomMain causeRemedy
Even when the transfer shift lever is
in the º4Hº position, the 4WD front
wheel indicator lamp does not
illuminate.Broken harness wire between the 4WD
indicator-ECU and the free-wheel
engage switch, or broken earth wire
from the free wheel engage switchRepair the harness.
Free wheel engage switch is defective.Replace the switch.
Even when the transfer shift lever is
in the º4Hº position, the free wheel
differential indicator lamp does not
illuminate
Broken harness wire between the 4WD
indicator-ECU and the 4WD position
detection switchRepair the harness.
illuminate.Broken wire in the 4WD indicator-ECU
circuit4WD indicator-ECU inspection (Re-
fer to GROUP 22 ± 4WD indicator-
ECU.)
Free wheel differential indicator
lamp illuminates regardless of the
p
osition of the transfer shift lever
Short in the harness wire in the 4WD
position detection switch circuitRepair the harness.
position of the transfer shift lever.4WD position detection switch is
defective.Replace the switch.
Short in the ABS-ECU circuitReplace the ABS-ECU.
Short in the 4WD indicator-ECU circuit4WD indicator-ECU inspection (Re-
fer to GROUP 22 ± 4WD indicator-
ECU.)
No indicator is illuminatedPower circuit in the 4WD indicator-ECU
is defective.Repair the harness.
4WD indicator-ECU is defective.4WD indicator-ECU inspection (Re-
fer to GROUP 22 ± 4WD indicator-
ECU.)
NOTE
When checking a short in the ABS-ECU circuit, remove the ABS-ECU connector and check if the 4WD
indicator returns to normal. If it returns to normal, the ABS-ECU is defective. Furthermore, if the ABS-ECU
is normal, then the 4WD indicator-ECU will be defective.

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.

ABS <4WD> ± Troubleshooting35C-13
Connector
terminal
No.SignalChecking requirementsNormal condition
37Output to valve relayIgnition
switch: ONApproximately 1 second
after engine is started.
The relay is on.2 V or less
The system runs down.
The relay is off.System voltage
38Output to motor relayIgnition switch: ON
(Approximately 1 second
Motor is on2 V or less
(A roximately 1 second
after engine is started)Motor is offSystem voltage
39Idle-up solenoid valve (+)Ignition switch: ON (When motor is on
approximately 1 second after engine is
started)System voltage
41Output to front-right hydraulic
unit solenoid valve (OUT side)Ignition switch: ON (When solenoid valve
is off approximately 1 second after
engine is started)System voltage
43Idle-up solenoid valve (±)Ignition switch: ON (When motor is on
approximately 1 second after engine is
started)2 V or less
45Input from free wheel engage
switch
Ignition
switch: ON
Engage 2WDSystem voltage
switchswitch: ON
Engage 4WD1 V or less
46*1Ignition switchIgnition switch: ONSystem voltage
Ignition switch: START0 V
46*2Input from rear differential
lock detection switchIgnition
switch: ONRear differential lock
switch: ON0 V
Rear differential lock
switch: OFFSystem voltage
47Input from diagnosis
indication selection
Connect the MUT-II.0 V
indication selection
Do not connect the MUT-II.Approx. 12 V
48Input from valve relay monitorIgnition switch: ONSystem voltage
49Motor monitorIgnition switch: ON
(Approximately 1 second
Motor is onSystem voltage
(A roximately 1 second
after engine is started)Motor is off0.5 V or less
50Output to ABS warning lampIgnition
switch: ON
The lamp is switched offSystem voltage
switch: ON
The lamp illuminates0 ± 2 V
52Output to front-right hydraulic
unit solenoid valve (IN side)Ignition switch: ON (When solenoid valve
is off approximately 1 second after
engine is started)System voltage
NOTE
*1: Vehicles without rear differential lock
*2: Vehicles with rear differential lock

STEERING ± Service Specifications37A-3
SERVICE SPECIFICATIONS37100030021
ItemsStandard valueLimit
Steering wheel free play mmWith engine running±50
With engine stopped10 or less±
Steering angle2WDInner wheel33
55' ± 36
55'±
Outer wheel30
57'±
4WDInner wheel29
40' ± 32
40'±
Outer wheel29
30'
Steering gear backlash mm±0.5
Variation of tie rod end ball joint shaft direction mm±1.5
Tie rod end ball joint starting torque Nm3.0±
Steering gear oil level mm22±
Engine idle speed r/min4G6750 + 100±
4D56750 + 100±
Stationary steering effort N39.2 or less±
Oil pump
p
ressure MPa
Oil pump relief pressure8.3 ± 9.0±
ressure MPa
Pressure under no-load conditions0.8 ± 1.0±
Steering gear retention hydraulic pressure8.3 ± 9.0±
Oil pressure switch operating pressure MPaOFF
ON1.5 ± 2.0±
ON
OFF0.7 ± 1.2±
Mainshaft starting torque Nm0.49 ± 0.78±
Cross-shaft axial play mm0.05 or less±
Mainshaft total starting torque Nm<2WD>0.98 ± 1.47±
<4WD>0.69 ± 1.28±
Pitman arm ball joint starting torque Nm0.5 ± 1.5±
Mainshaft axial play mm0.03 or less±
Backlash between ball groove of rack piston and balls mm±0.05
Idler arm sliding resistance N2WD8.8 ± 30±
4WD2.4 ± 16±

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
><