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

BRAKE CONTROL SYSTEM
5A–24

EHCU Connector Pin-out Checks

f Disconnect Electronic Hydraulic Control Module.
f Perform checks with high impedance digital
multimeter J-39200 or equivalent.
No. Circuit to be Tested
1 Power supply
2 Ignition enable
3 Stoplight switch
4 Ground connection
5 FL speed sensor
6 FR speed sensor
7 RR speed sensor
Ignition Multimeter
Switch Scale/Range
Position
OFF 20DCV
OFF 20DCV
ON 20DCV
OFF 20DCV
OFF 200W
OFF 1W
OFF 2kW
OFF 200kW
OFF 200mACV
OFF 2kW
OFF 200kW
OFF 200mACV
OFF 2kW
OFF 200kW
OFF 200mACV
Measure be- Nominal Value
tween Pin
Number
1 (C–5) 11.5V to 14.5V
2 (C–5)
1 (C–4) 0V to 0.1V
7 (C–4)
1 (C–4) 11.5V to 14.5V
7 (C–4)
13 (C–4) 10.5V to 14.5V
7 (C–4)
7 (C–4) Less than 2W
Ground
2 (C–5) Less than 0.2W
Ground
2 (C–4) 2.0kW to 2.8kW
10 (C–4)
2 (C–4) more than
7 (C–4) 100kW
2 (C–4) more than
10 (C–4) 200mV
3 (C–4) 2.0kW to 2.8kW
11 (C–4)
3 (C–4) more than
7 (C–4) 100kW
3 (C–4) more than
11 (C–4) 200mV
4 (C–4) 1.2kW to 2.0kW
12 (C–4)
4 (C–4) more than
7 (C–4) 100kW
4 (C–4) more than
12 (C–4) 200mV
Note
Press brake pedal
Internal Resistance
Insulation Resistance
Turn wheel at 1RPS
Internal Resistance
Insulation Resistance
Turn wheel at 1RPS
Internal Resistance
Insulation Resistance
Turn wheel at 1RPS