Hummer H1 Service Manual page 477

7-38 Brake System
Fault Code Problem Area
4-2 Short circuit to
ground between
ECU and left
front inlet sole-
noid valve.
4-3 Short circuit to
ground between
ECU and left
front outlet
solenoid valve.
4-4 Short circuit to
ground between
ECU and right
rear inlet sole-
noid valve.
4-5 Short circuit to
ground between
ECU and right
rear outlet
solenoid valve.
4-6 Short circuit to
ground between
ECU and left
rear inlet sole-
noid valve.
4-7 Short circuit to
ground between
ECU and left
rear outlet
solenoid valve.
4-8 Short circuit to
ground between
ECU and RCP
relay 1.
4-9 Short circuit to
ground between
ECU and RCP
relay 2.
4-12
Right front
wheel speed
sensor open cir-
cuit.
_____________________________________________________________
Ignition key "OFF" to test system (except where noted)
Test Pin
Locations
23 and 27
24 and 27
4 and 27
5 and 27
21 and 27
22 and 27
11 or 30 and 27
12 and 27
17 and 34
Fault Code List
Values
5.0-7.5 W
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
3.0-5.0 W
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
5.0-7.5 W
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
3.0-5.0 W
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
5.0-7.5 W
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
3.0-5.0 W
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
Open circuit Check wiring to pump relay and pump connector
through pump. Repair wiring or replace modula-
tor as necessary.
Open circuit Check wiring to pump relay and pump connector
through pump. Repair wiring or replace modula-
tor as necessary.
500-2000 W
Check electrical resistance of affected sensor and
wiring at ECU connector and at harness plugs.
Repair wiring or replace sensor as necessary.
Check/Repair
®