relay MITSUBISHI TRITON 1997 Owner's Manual

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-10
Code No. 41, 42, 43 Solenoid valveProbable cause
The ABS-ECU always monitors the solenoid valve drive circuit. It determines that
there is an open or short-circuit in the solenoid coil or in a harness: When no current
flows in the solenoid even though the ABS-ECU turns on it, and vice versa.
Malfunction of wiring harness

Malfunction of hydraulic unit

Malfunction of ABS-ECU
NG
Check the harness between the hydrau-
lic unit and ABS-ECU, and repair if nec-
essary.
OK
Check trouble symptoms.
Measure at hydraulic unit connector
A-09.

Disconnect the connector and
measure at the harness side.

Resistance values between the
following terminals
1-5, 2-5, 3-5
OK: 5.0 W
6-5, 7-5, 8-5
OK: 2.2 WNGReplace the hydraulic unit.
OK
Measure at hydraulic unit connector
A-09 and ABS-ECU connectors C-62
and C-64.

Disconnect the connector and
measure at the harness side.

Continuity between the following
terminals
OK:Continuity
HU side
ABS-ECU
side (C-64)
HU side
ABS-ECU
side (C-62)NGCheck the following connectors.
A-09, C-62 and C-64NG
Repair
OK
Measure at hydraulic unit connector
A-09 and valve relay connector A-39.

Disconnect the connector and
measure at the harness side.

Continuity between the following
terminals
OK:Continuity
HU side
Valve relay sideNGCheck the following connector and
diode.
A-09 and A-39NG
Repair
OK
Check trouble symptoms.NGCheck the harness between the hydrau-
lic unit and valve relay, and repair if nec-
essary.
OK
Check the following connectors.
C-62 and C-64NG
Repair
OK
Check trouble symptoms.NGReplace the ABS-ECU. 1
52
2
14 6
41
3
37
18
2
5
310
3

ABS <2WD> ± Troubleshooting35B-11
Code No. 51 Valve relayProbable cause
When the ignition switch is turned to ON, the ABS-ECU switches the valve relay
off and on during the initial check. In that way, the ABS-ECU compares the signals
sent to the valve relay with the voltage in the valve power monitor line. That is how
to check if the valve relay is operating normally. The ABS-ECU always checks if
current flows in the valve power monitor line, too. It determines that there is an open
circuit when no current flows. If no current flows in the valve power monitor line,
this diagnosis code is output.
Malfunction of valve relay

Malfunction of wiring harness or connector

Malfunction of ABS-ECU

Malfunction of hydraulic unit
NOTE
Whenever reading the diagnosis codes using the ABS warning lamp (Refer to GROUP 00 ± How to
Use Troubleshooting/Inspection Service Points), this diagnosis code will be output. That is not a malfunction
but because the valve relay connector is disconnected. After repairing all other malfunctions, connect
the valve relay connector again to check the valve relay. Then check that the ABS warning lamp does
not illuminate. If it illuminates, the valve relay may be defective. So carry out the following procedure.
Valve relay check. (Refer to P. 35B-28.)NGReplace the valve relay.
OK
Measure at valve relay connector A-39.

Disconnect the connector and
measure at the harness side.

Voltage between 6 ± body earth
OK:System voltageNGCheck the harness between fusible link
No. 11 and valve relay, and repair if nec-
essary.
OK
Measure at ABS-ECU connector C-62
and C-64.

Disconnect the connector and
measure at the harness side.

Resistance between 26 ± 37
OK:60 ± 120 WNGCheck the following connector.
A-39OKCheck trouble symptoms.
NG
Check the harness between valve relay
and ABS-ECU, and repair if necessary.
OK
Measure at ABS-ECU connector C-64.

Disconnect the connector and
measure at the harness side.

Continuity between 48 ± body earth
OK:ContinuityNGCheck the harness between the valve
relay and ABS-ECU, and repair if neces-
sary.
OK
Check the following connector.
C-64OKCheck trouble symptoms.NGReplace the ABS-ECU.

ABS <2WD> ± Troubleshooting35B-12
Code No. 53 Motor relay, motorProbable cause
These codes are output at the following times:
When the motor relay is on but no signal is input to the motor monitor line (motor
is not operating, etc.)
When the motor relay is off but a signal is input to the motor monitor line for 5 seconds
or more (motor continues operating, etc.)
When the motor relay does not operate
Malfunction of motor relay

Malfunction of wiring harness or connector

Malfunction of hydraulic unit

Malfunction of ABS-ECU
Caution
Because force-driving of the motor by means of the actuator test will drain the battery, the engine
should be started and left to run for a while after testing is completed.
NG
Repair
MUT-II Actuator test
Is the sound of the motor operating
heard for items 01 ± 03 only?Ye sCheck the harness between the hydrau-
lic unit and ABS-ECU, and repair if nec-
essary.
No
ABS motor relay check. (Refer to
P.35B-28.)NGReplace the motor relay.
OK
Measure at motor relay connector A-38.

Disconnect the connector and
measure at the harness side.

Voltage between 5 ± body earth
OK:System voltageNGCheck the harness between fusible link
No. 11 and ABS motor relay, and repair
if necessary.
OK
Measure at ABS-ECU connectors C-62
and C-64.

Disconnect the connector and
measure at the harness side.

Resistance between 26 ± 38
OK:72 ± 88 WNGCheck the following connector.
A-38
OK
Check trouble symptoms.NGCheck the harnesses between motor
relay and ABS-ECU, and repair if
necessary.
OK
Measure at ABS-ECU connector C-64.

Disconnect the connector and
measure at the harness side.

Continuity between 49 ± body earth
OK:ContinuityNGCheck the harness between the
hydraulic unit and ABS-ECU, and repair
if necessary. Motor earth, repair if
necessary.
OK
Motor operation check. (Refer to
P.35B-27.)NGReplace the hydraulic unit.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptoms.NGReplace the ABS-ECU.

ABS <2WD> ± Troubleshooting35B-16
Inspection Procedure 3
When ignition key is turned to ºONº (engine stopped),
ABS warning lamp does not illuminate.
Probable cause
When current flows in the ABS-ECU, the valve relay turns from off to on, off and
back to on again as the initial check. So the ABS warning lamp will illuminate twice
when the valve relay is off even if there is a problem with the circuit between the
ABS warning lamp and the ABS-ECU.
Therefore, if the lamp does not illuminate, the cause may be: an open circuit in the
lamp power supply circuit, a blown lamp bulb, an open circuit in both the circuit between
the ABS warning lamp and the ABS-ECU and in the circuit between the ABS warning
lamp and the valve relay.
Blown fuse

Burnt out ABS warning lamp bulb

Malfunction of wiring harness or connector
OK
Check trouble symptoms.NGReplace the combination meter. NG
Repair
OK
Check the following connectors.
C-88, C-79, C-06, C-05 and C-02
OK
Check the harnesses between the valve
relay and connector C-02 and between
the ABS-ECU and connector C-02. Re-
pair if necessary.
OK
Measure at connector C-02:

Disconnect the connector and
measure at the male pin.

Ignition switch: ON

Does the ABS warning lamp
illuminate when terminal (3) is
earthed?
OK:IlluminatesNGCheck whether the ABS warning lamp
bulb is burnt out.NGReplace the ABS warning lamp bulb.
Fuse inspection, Multi-purpose fuse No.
11NGRefer to GROUP 00 ± Inspection Ser-
vice Points for a Blown Fuse.
Inspection Procedure 4
Even after the engine is started, the ABS warning lamp
remains illuminated.
Probable cause
The cause is probably a short-circuit in the ABS warning lamp illumination circuit.
Malfunction of combination meter

Malfunction of ABS-ECU

Malfunction of wiring harness
NOTE
This trouble symptom is limited to cases where communication with the MUT-II is possible (ABS-ECU
power supply is normal) and the diagnosis code is a normal diagnosis code.
No
Check the harnesses between the combination meter and the ABS-
ECU and between the combination meter and the valve relay. Repair,
if necessary.
No

Disconnect ABS-ECU connector C-64.

Disconnect valve relay connector A-39.

Ignition switch: ON

Does the ABS warning lamp switch off?Ye sReplace the ABS-ECU.
Disconnect connector C-02 and turn the ignition switch to ON.

Does the ABS warning lamp remain illuminated?Ye sReplace the combination meter.

ABS <2WD> ± Troubleshooting35B-17
Inspection Procedure 5
When ignition key is turned to ºSTARTº, ABS warning
lamp does not illuminate.
Probable cause
Current does not flow in the ABS-ECU when the ignition switch is turned to START.
Current flows in the ABS warning lamp even when the ignition switch is turned to
START. Therefore, the valve relay, which current is supplied through the ABS-ECU,
turns off when the ignition switch is at START. However, the warning lamp circuit
of the valve relay must turn on in turn. So the cause must be a defective circuit
on valve relay side.
Malfunction of wiring harness or connector

Malfunction of ABS-ECU
ABS valve relay check (Refer to
P.35B-28.)NGReplace the ABS valve relay.
OK

Disconnect valve relay connector
A-39.

Disconnect ABS-ECU connector
C-64.

Ignition switch: ON

Voltage between valve relay
harness-side connector terminal (3)
and body earth
OK:System voltageNGCheck the following connector and
diode.
C-02 and C-05NG
Repair
OK
Check trouble symptoms.NGCheck the harness between the com-
bination meter and valve relay, and re-
pair if necessary.
OK
Check the following connector.
A-39NG
Repair
OK
Check trouble symptoms.NGCheck the harness between the valve
relay and earth, and repair if necessary.
Inspection Procedure 6
The ABS warning lamp flashes twice after the ignition key
is turned to ºONº. The lamp illuminates when the ignition
key is turned to ºSTARTº, and when the key is returned to
ºONº, it flashes once.
Probable cause
The ABS-ECU causes the ABS warning lamp to illuminate during the initial check
(approx. 3 seconds). During the initial check, the valve relay turns from off to on,
off and back to on again. If there is an open circuit in the harness between the ABS-ECU
and the ABS warning lamp, the lamp will illuminate only when the valve relay is OFF
during valve relay test, etc.
Malfunction of wiring harness or connector

Malfunction of ABS-ECU

Disconnect valve relay connector
A-39.

Disconnect ABS-ECU connector
C-64.

Ignition switch: ON

Voltage between ABS-ECU har-
ness-side connector terminal (50)
and body earth
OK:System voltageNGCheck the following connector.
C-02NG
Repair
OK
Check trouble symptom.NGCheck the harness between the com-
bination meter 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 <2WD> ± Troubleshooting35B-21
Connector
terminal No.SignalChecking requirementsNormal condition
43Idle-up solenoid valve (±)Ignition switch: ON (The motor is on approximately
1 second after engine is started.)2 V or less
46Ignition switchIgnition switch: ONSystem voltage
Ignition switch: START0 V
47Input from diagnosis indication
selection
Connect the MUT-II.0 V
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 after
Motor is on.System voltage
A roximately 1 second after
engine is startedMotor is off.0.5 V or less
50Output to ABS warning lampIgnition
switch: ON
The lamp is switched off.System voltage
switch: ON
The lamp is illuminated.0 ± 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

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-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