Ehcu Connector Pin-Out Checks - Isuzu Trooper 1999 Workshop Manual

5A–12
BRAKE CONTROL SYSTEM

EHCU Connector Pin-out Checks

f Disconnect Electronic Brake Control Module.
f Perform checks with high impedance digital
multimeter J-39200 or equivalent.
No. Circuit to be Tested
1 Ignition enable
2 Stop light switch
3 Ground connection
4 FL speed sensor
5 FR speed sensor
6 RL speed sensor
7 RR speed sensor
8 G-sensor
9 Transmission Input
Ignition Multimeter
Switch Scale/Range
Position
OFF 20DCV
ON 20DCV
OFF 20DCV
OFF 200m
OFF 2km
OFF 200km
OFF 200mACV
OFF 2km
OFF 200km
OFF 200mACV
OFF 2km
OFF 200km
OFF 200mACV
OFF 2km
OFF 200km
OFF 200mACV
ON
ON 20DCV
Measure be- Nominal Value
tween Pin
Number
8 (+), 15 (–) 0V to 0.1V
8 (+), 15 (–) 11.5V to 14.5V
10, 15 10.5V to 14.5V
12, Ground Less than 2m
15, Ground
20, 21 1.3k to 1.9km
20, 15 more than
100km
20, 21 more than
200mV
4, 5 1.3k to 1.9km
4, 15 more than
100km
4, 5 more than
200mV
22, 23 1.3k to 1.9km
22, 15 more than
100km
22, 23 more than
200mV
2, 3 1.3k to 1.9km
2, 15 more than
100km
2, 3 more than
200mV
26, 8 1k to 2km
6 (+), 15 (–) Less than 6V
(shift lever posi-
tion – L, R)
6.6 to 9.0V
(other shift
position)
More than 9.6V
(shift lever posi-
tion – 1, 2, R)
6.6 to 9.0V
(other shift
position)
Note
Press brake pedal
Internal Resistance
Insulation Resistance
Turn wheel at 1RPS
Internal Resistance
Insulation Resistance
Turn wheel at 1RPS
Insulation Resistance
Internal Resistance
Turn wheel at 1RPS
Internal Resistance
Insulation Resistance
Turn wheel at 1RPS
Horizontal vehicle
A/T
Battery voltage 12V
M/T
Battery voltage 12V