ISUZU TROOPER 1998 Service Repair Manual

5A±11 BRAKE CONTROL SYSTEM
Data List
DisplayContentOK/NG Criteria for Data
Battery VoltageVoltage
Between 10-16.9V
Brake Light SwitchOpen/Close
Open(0V) when pedal is released

Closed(12V) when pedal is depressed.
Front Left Wheel Speed
Front Right Wheel Speed
Rear Left Wheel Speed
Rear Right Wheel SpeedMPH(km/h)
Start the vehicle and make sure of linear change in each
wheel speed.

Turn each wheel by hand and make sure that each
speed data change.
Wheel Sensor StatusOK/NG
To be OK usually
G-sensorLow/High
To be Low usually
Transfer Monitor(TOD)2 Wheel Drive
4 Wheel Drive
When 2WD: 2 Wheel Drive

When 4WD: 4 Wheel Drive
Off-Road Switch
(Transmission Input)
Active/Inactive
When shift lever position is 1, 2 and R: Active (M/T)
(Transmission Input)
When shift lever position is L and R: Active (A/T)
Valve RelayActive/Inactive
To be Active usually
ABS StateON/OFF
To be OFF usually
ABS RelayActive/Inactive
To be Active usually
Return Pump RelayActive/Inactive
To be Inactive usually
Front Left Isolation ValveActive/Inactive
To be Inactive usually
Front Left Dump Valve
Front Right Isolation Valve
Front Right Dump Valve
Rear Isolation Valve
Rear Dump Valve
ABS Warning LampON/OFF
To be ON usually (while engine stopped)

5A±12
BRAKE CONTROL SYSTEM
EHCU Connector Pin-out Checks

Disconnect Electronic Brake Control Module.

Perform checks with high impedance digital
multimeter (5-8840-0366-0) or equivalent.
No.
Circuit to be TestedIgnition
Switch
PositionMultimeter
Scale/RangeMeasure
between
Pin NumberNominal ValueNote
1Ignition enableOFF20DCV8 (+), 15 (±)0V to 0.1V
ON20DCV8 (+), 15 (±)11.5V to 14.5V
2Stop light switchOFF20DCV10, 1510.5V to 14.5VPress brake pedal
3Ground connectionOFF200
12, Ground
15, GroundLess than 2

4FL speed sensorOFF2k
20, 211.3k to 1.9k
Internal Resistance
OFF200k
20, 15more than
100k
Insulation Resistance
OFF200mACV20, 21more than
200mVTurn wheel at 1RPS
5FR speed sensorOFF2k
4, 51.3k to 1.9k
Internal Resistance
OFF200k
4, 15more than
100k
Insulation Resistance
OFF200mACV4, 5more than
200mVTurn wheel at 1RPS
6RL speed sensorOFF2k
22, 231.3k to 1.9k
Insulation Resistance
OFF200k
22, 15more than
100k
Internal Resistance
OFF200mACV22, 23more than
200mVTurn wheel at 1RPS
7RR speed sensorOFF2k
2, 31.3k to 1.9k
Internal Resistance
OFF200k
2, 15more than
100k
Insulation Resistance
OFF200mACV2, 3more than
200mVTurn wheel at 1RPS
8G-sensorON26,81k to 2k
Horizontal vehicle
9Transmission InputON20DCV6 (+), 15 (±)Less than 6V
(Shift lever
position ± L, R)
6.6 to 9.0V
(other shift
position)A/T
Battery voltage 12V
More than 9.6V
(Shift lever
position ±
1, 2, R)
6.6 to 9.0V
(other shift
position)M/T
Battery voltage 12V

5A±13 BRAKE CONTROL SYSTEM
Circuit Diagram (LHD model / 6VD1 and 4JG2)
D08RW793

5A±14
BRAKE CONTROL SYSTEM
Circuit Diagram (LHD model / 4JG2)
D08RW792

5A±15 BRAKE CONTROL SYSTEM
Circuit Diagram (LHD model / 4JG2)
D08RW791

5A±16
BRAKE CONTROL SYSTEM
Circuit Diagram (LHD model / 6VD1)
D08RW790

5A±17 BRAKE CONTROL SYSTEM
Circuit Diagram (LHD model / 6VD1)
D08RW789

5A±18
BRAKE CONTROL SYSTEM
Connector List (LHD model)

5A±19 BRAKE CONTROL SYSTEM

5A±20
BRAKE CONTROL SYSTEM
Part Location (LHD model)
D08RW808
Legend
(1) F±2
(2) F±3
(3) H±33
(4) H±7, H±8, H±25
(5) H±46
(6) C±16
(7) C±63
(8) Fuse Box
(9) B±13 or B±14
(10) C±13
(11) H±5
(12) H±10, H±11(13) E±30
(14) C±41
(15) H±42
(16) C±85
(17) C±4 (EHCU)
(18) Relay & Fuse Box
(19) C±39
(20) H±12, H±13, H±15, H±16
(21) E±47, E±48, M±1
(22) E±42, E±43, M±8
(23) B±25
(24) I±10
(25) I±9