1997 MITSUBISHI TRITON wheel

ABS <2WD> ± Troubleshooting35B-6
INSPECTION CHART FOR DIAGNOSIS CODES35201130156
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 circuit35B-7
12Front left wheel speed sensor
13Rear right wheel speed sensor
14Rear left wheel speed sensor
15Wheel speed sensorAbnormal output signal35B-8
16Power supply system35B-8
21Front right wheel speed sensorAbnormal35B-7
22Front left wheel speed sensor
23Rear right wheel speed sensor
24Rear left wheel speed sensor
33Stop lamp switch system35B-9
41Front right solenoid valve35B-10
42Front left solenoid valve
43Rear solenoid valve
51Valve relay35B-11
53Motor relay, motor35B-12
63ABS-ECU35B-41
(Replace the ABS-ECU)
64
(Re lace the ABS-ECU)

ABS <2WD> ± Troubleshooting35B-7
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code No. 11, 12, 13, 14 Wheel speed sensor open circuit
or short circuitProbable cause
Code No. 21, 22, 23, 24 Wheel speed sensor abnormal
The ABS-ECU determines that an open circuit or short circuit occurs in more than
one line of wheel speed sensors.
Malfunction of wheel speed sensor

Malfunction of wiring harness or connector

Malfunction of ABS-ECU
These codes are output at the following times:

When an open circuit cannot be found, but more than one wheel speed sensor
does not output any signal during driving at 8 km/h or higher.

When a chipped or plugged-up rotor tooth, etc. is detected.

When the sensor output drops and anti-lock control is continuously carried out
due to a defective sensor or a warped rotor.
Malfunction of wheel speed sensor

Malfunction of rotor

Malfunction of wheel bearing

Malfunction of wiring harness or connector

Malfunction of ABS-ECU
NG
Replace the ABS-ECU.
OK
Check trouble symptoms.
OK
Check the following connector.
C-62NG
RepairOK
Wheel bearing check. (Refer to GROUP
26 and 27 ± On-vehicle Service.)
OK
Rotor check. (Refer to P.35B-40.)NGReplace the rotor.
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.
OK
Measure at the ABS-ECU connectors
C-62

Disconnect the connector and
measure from the harness side.

Resistance values between 10 ± 23,
7 ± 20, 8 ± 21 and 9 ± 22.
OK: 1.2 ± 1.4 kWNGCheck the following connectors.
A-01, A-07, F-01, F-16, D-01 and C-02NG
Repair
Wheel speed sensor installation check.NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between each
wheel speed sensor and ABS-ECU, and
repair if necessary.

ABS <2WD> ± Troubleshooting35B-8
Code No. 15 Wheel speed sensor (Abnormal output signal)Probable cause
A wheel speed sensor outputs an abnormal signal (other than an open or short-circuit).
Improper installation of wheel speed sensor

Malfunction of wheel speed sensor

Malfunction of rotor

Malfunction of wheel bearing

Malfunction of wiring harness or connector

Malfunction of ABS-ECU
NG
Replace the ABS-ECU.
OK
Check trouble symptoms.
OK
Wheel bearing check. (Refer to GROUP
26 and 27 ± On-vehicle Service.)OKCheck the harness wire between each
wheel speed sensor and ABS-ECU, and
repair if necessary.
OK
Rotor check. (Refer to P.35B-40.)NGReplace the rotor.
OK
Check the following connector.
C-62NG
Repair
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
Code No. 16 Power supply systemProbable cause
The voltage of the ABS-ECU power supply drops lower or rises higher than the specified
value. If the voltage returns to the specified value, this code is no longer output.
Malfunction of wiring harness or connector.

Malfunction of ABS-ECU
Caution
If battery voltage drops or rises during inspection, this code will be output as well. If the voltage
returns to standard value, this code is no longer output.
Before carrying out the following inspection, check the battery level, and refill distilled water if
necessary.
OK
Check the battery.
OK
Check trouble symptoms.NGCheck the harnes wire between the igni-
tion switch and the ABS-ECU, and repair
if necessary.
OK
Check trouble symptoms.NGReplace the ABS-ECU.
OK
Check the following connector.
C-62NG
Repair
Measure at the ABS-ECU connector
C-62.

Disconnect the connector and
measure at the harness side.

Start the engine. Voltage between
13 ± Body earth
OK:System voltageNGCheck the following connectors.
C-88, C-86 and C-02NG
Repair

ABS <2WD> ± Troubleshooting35B-14
INSPECTION CHART FOR TROUBLE SYMPTOMS35201140142
Get an understanding of the trouble symptoms and check according to the inspection procedure chart.
Trouble symptomsInspection
procedure No.Reference
page
Communication with MUT-II
is notpossible
Communication with all systems is not possible.135B-15
is not ossible.
Communication with ABS only is not possible.235B-15
When the ignition key is turned to ªONº (engine stopped), the ABS warning lamp does
not illuminate.335B-16
After the engine starts, the ABS warning lamp remains illuminated.435B-16
When the ignition key is turned to ªSTARTº, the ABS warning lamp does not illuminate.535B-17
After the ignition key is turned to ªONº, the ABS warning lamp blinks twice, and when
turned to ªSTARTº, it illuminates. When returned to ªONº, the lamp flashes once, and
then switches off.635B-17
Faulty ABS operationUnequal braking power on both sides735B-18
Insufficient braking power
ABS operates under normal braking conditions
ABS operates before vehicle stops under normal
braking conditions
Large brake pedal vibration (Caution 2.)±±
Caution
1. If steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.
2. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such
phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.

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.)