MITSUBISHI TRITON 1997 Workshop Manual

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-9
Code No. 27 Rear differential lock detection switch
Probable cause
The ABS-ECU determines that an open circuit occurs in rear differential detection
switch system.
Malfunction of wiring harness or connector

Malfunction of rear differential lock-ECU

Malfunction of ABS-ECU
Does the 4WD indicator lamp (rear dif-
ferential lamp) operate normally?NoRear differential lock-ECU check.NGReplace the rear differential lock-ECU.
Ye s
Measure at the ABS-ECU connector
C-64.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Rear differential lock switch: OFF

Voltage between 46 and body earth
OK:System voltageNGCheck the following connectors.
C-88, C-86, C-02 and C-64NG
Repair
OK
Check trouble symptom.NGCheck the harness between rear differ-
ential detection switch and the ABS-
ECU, and repair if necessary.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptoms.NGReplace the ABS-ECU.
Code No. 27 Rear differential lock detection switch
Probable cause
For vehicles without rear differential lock, battery positive voltage is applied to the
ABS-ECU terminal No. 46.
This code is output when this line is interrupted.
Malfunction of wiring harness or connector

Malfunction of ABS-ECU
Is the fuse No. 7 normal?NoReplace the fuse after eliminating the
cause of the blowout.
Ye s
Measure at the ABS-ECU connector
C-64.

Disconnect the connector and
measure at the harness side.

Ignition switch ON

Voltage between 46 and body earth
OK:System voltageNGCheck the following connectors.
C-88, C-86, C-02 and C-64NG
Repair
OK
Check trouble symptoms.NGCheck the harness between fuse No.
7 inside the junction block and the ABS-
ECU, and repair if necessary.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptoms.NGReplace the ABS-ECU.

ABS <4WD> ± Troubleshooting35C-10
Code No. 32 G-sensor systemProbable cause
This code is output at the following times:
The G-sensor output is less than 0.5 V or more than 4.5 V.
An open or short circuit is present in the G-sensor system.
Malfunction of G-sensor

Malfunction of wiring harness or connector

Malfunction of ABS-ECU
G-sensor check (Refer to P. 35C-20.)NGReplace the G-sensor.
OK
Measure at ABS-ECU connector C-62.

Ignition switch ON

Voltage between 4 and 17
OK:2.4 ± 2.6 VNGCheck the following connector.
C-02NG
Repair
OK
Check trouble symptom.NGCheck the harness between the G-sen-
sor and the ABS-ECU, and repair if nec-
essary.OK
Check the following connector.
C-62NG
Repair
OK
Check trouble symptom.
NG
Replace the ABS-ECU.
ABS WARNING LAMP INSPECTION35201200086
Refer to GROUP 35B ± Troubleshooting.
INSPECTION CHART FOR TROUBLE SYMPTOMS35201140159
Refer to GROUP 35B ± Troubleshooting.

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.

S
ig nal C
heckin g r e quir e m ents N
orm al c o ndit io n 1 O
utp ut to fr o nt- le ft h yd ra ulic
u nit s o le noid v a lv e ( O UT s id e) I
g nit io n s w it c h : O N
( W hen s o le noid v a lv e is o ff a ppro xim ate ly 1
se co nd afte r engin e is sta rte d) S
yste m v o lt a ge 2 O
utp ut to r e ar h yd ra ulic u nit
s o le noid v a lv e ( O UT s id e) 1 d f
t i i t t d
) 3 O
utp ut to r e ar h yd ra ulic u nit
s o le noid v a lv e ( IN s id e) 4 G
-s e nso r s ig nal I
g nit io n s w it c h : O N 2
.4 ± 2 .6 V ( H oriz o nta l
c o ndit io n) 1
3 A
BS-E C U p ow er s u pply I
g nit io n s w it c h : O N S
yste m v o lt a ge I
g nit io n s w it c h : S TA R T 0
V 1
4 O
utp ut to fr o nt- le ft h yd ra ulic
u nit s o le noid v a lv e ( IN s id e) I
g nit io n s w it c h : O N ( W hen s o le noid v a lv e
i s o ff a ppro xim ate ly 1 s e co nd a fte r e ngin e
i s s ta rte d) S
yste m v o lt a ge 1
7 G
-s e nso r e arth A
lw ays 0
V 2
6 O
utp ut to r e la y p ow er s u pply I
g nit io n s w it c h : O N S
yste m v o lt a ge 3
1 F
re e w heel e ngage s w it c h I
g nit io n s
w it c h :O N 2
W D S
yste m v o lt a ge s
w it c h : O
N 4
W D 1
V o r le ss 3
2 M
em ory p ow er s u pply A
lw ays S
yste m v o lt a ge 3
4 I
n put fr o m s to p la m p s w it c h I
g nit io n s
w it c h :O N S
to p la m p s w it c h O N S
yste m v o lt a ge s
w it c h : O
N S
to p la m p s w it c h O FF 1
V o r le ss 3
5 I
n put fr o m 4 W D d ete ctio n s
w it c h I
g nit io n s
w it c h :O N T
ra nsfe r le ve r p osit io n: 2 H S
yste m v o lt a ge s
w it c h s
w it c h : O
N T
ra nsfe r le ve r p osit io n: 4 H 1
V o r le ss 3
6 M
UT-II S
eria l c o m munic a tio n
w it h M UT-II 1
V o r le ss

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

S
ig nal N
orm al c o ndit io n 1
± B ody e arth F
ro nt- le ft s o le noid v a lv e ( O UT s id e) 2
.2 W R
ear s o le noid v a lv e ( O UT s id e) 2
.2 W R
ear s o le noid v a lv e ( IN s id e) 5
.0 W F
ro nt- le ft w heel s p eed s e nso r
( + w ir e ) 1
.2 ± 1 .4 k W R
ear-rig ht w heel s p eed s e nso r
( + w ir e ) 1
.2 ± 1 .4 k W R
ear-le ft w heel s p eed s e nso r ( + w ir e ) 1
.2 ± 1 .4 k W F
ro nt- rig ht w heel s p eed s e nso r
( + w ir e ) 1
.2 ± 1 .4 k W F
ro nt- le ft s o le noid v a lv e ( IN s id e) 5
.0 W A
BS-E C U e arth C
ontin uit y 1
6 ± B ody e arth 2
5 ± B ody e arth 3
9 ± 4 3 I
d le -u p s o le noid v a lv e 3
7 ± 4 4 W F
ro nt- rig ht s o le noid v a lv e ( O UT s id e) 2
.2 W A
BS-E C U e arth C
ontin uit y 4
8 ± B ody e arth I
n put fr o m v a lv e r e la y m onit o r C
ontin uit y 4
9 ± B ody e arth M
oto r m onit o r C
ontin uit y 5
2 ± B ody e arth F
ro nt- rig ht s o le noid v a lv e ( IN s id e) 5
.0 W

F
R O NT D IS C B RAKE 35200600023
R EM OVA L A ND IN STA LLA TIO N 9
0 N m 1
5 N m 1
2 3
4
R em oval s te p s
1 . B ra ke tu be
2 . Fro nt b ra ke a sse m bly ( R efe r to
G RO UP 3 5B ± F ro nt D is c B ra ke .)
3 . B ra ke h ose b ra cke t
4 . B ra ke d is c ( R efe r to G RO UP 2 6 ±
F ro nt H ub A sse m bly .)