Hummer H1 Service Manual page 475

7-36 Brake System
Fault Code List - Ignition key "OFF" to test system (except where noted)
Fault Code Problem Area
2-6 Shuttle valve
switch failure.
2-7 Continuous
power to ECU
with ignition
"OFF".
2-8 No voltage to
ABS solenoid
valves.
2-9 Inlet valve
supervision
time exceded.
2-10 Reference
ground inter-
rupted.
2-11 Excessive recir-
culation pump
cycle time.
2-12 RF sensor weak
2-13 LR sensor weak
2-14 LF sensor weak
2-15 RR sensor weak
3-0 Open circuit
between ECU
and right front
inlet solenoid
valve or wiring.
3-1 Open circuit
between ECU
and right front
outlet solenoid
valve or wiring.
3-2 Open circuit
between ECU
and left front
inlet solenoid
valve or wiring.
_____________________________________________________________
Test Pin
Locations
25 and 27 Brake pedal at
Brake pedal 1/2
Brake pedal full
9 and 27
Less than 0.2 Ω
19 and 27
1 and 27
9 and 27
Link 8 and 9
-
Less than 0.2 Ω
31
Ignition "ON"
link 9, 11 and
12
17 and 34 Greater than 0.9
18 and 35 volts AC at one
15 and 32
16 and 33
6 and 27
7 and 27
23 and 27
Values
If wiring and connections OK, replace modulator.
rest 3k Ω .
down 2k Ω .
down 1k Ω .
0 volts. Check for proper wiring connections, repair as
necessary.
to chassis
ground.
Ignition "ON" Check the valve relay, fuse and wiring. Repair as
approximate necessary.
battery +
voltage.
- Check voltage for normal function. Clear fault.
Repair wiring or connection as necessary.
to chassis
ground.
- Check RCP function. Clear fault.
Check sensor adjustment. Check geared hub bear-
ing play at halfshaft. Adjust or repair as necessary.
tire revolution
per second.
5.0-7.5 Ω
Check electrical resistance of affected valve wir-
ing to ground at the ECU connector and at the
modulator connector. Repair wiring or replace
modulator as necessary.
3.0-5.0 Ω
Check electrical resistance of affected valve wir-
ing to ground at the ECU connector and at the
modulator connector. Repair wiring or replace
modulator as necessary.
5.0-7.5 Ω
Check electrical resistance of affected valve wir-
ing to ground at the ECU connector and at the
modulator connector. Repair wiring or replace
modulator as necessary.
Check/Repair
®