Hummer H1 Service Manual page 481

7-42 Brake System
Fault Code Problem Area
6-6 Short circuit
between two
solenoid valve
leads of left
rear inlet sole-
noid valve.
6-7 Short circuit
between two
solenoid valve
leads of left
rear outlet
solenoid valve.
6-8 Short circuit
between sole-
noid valve and
RCP relay 1.
6-9 Short circuit
between sole-
noid valve and
RCP relay 2.
6-12 Right front
wheel speed
signal missing.
6-13 Left rear wheel
speed signal
missing.
6-14
Left front
wheel speed
signal missing.
6-15
Right rear
wheel speed
signal missing.
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Ignition key "OFF" to test system (except where noted)
Test Pin
Locations
21 and 4, 5, 6,
7, 22, 23, 24
22 and 4, 5, 6,
7, 21, 23, 24
11 and 4, 5, 6,
7, 21, 22, 23, 24
12 and 4, 5, 6,
7, 21, 22, 23, 24
17 and 34
18 and 35
15 and 32
16 and 33
Fault Code List
Values
5.0-7.5 W
Check electrical resistance of affected valves and
wiring at ECU connector and at modulator assem-
bly plug. Repair or replace wiring as necessary
and replace modulator if short is internal.
Note: Fault code for both affected valves will
be stored in memory.
3.0-5.0 W
Check electrical resistance of affected valves and
wiring at ECU connector and at modulator assem-
bly plug. Repair or replace wiring as necessary
and replace modulator if short is internal.
Note: Fault code for both affected valves will
be stored in memory.
Open circuit Check wiring harness at ECU connector to pump
relay. Repair or replace as necessary.
Open circuit Check wiring harness at ECU connector to pump
relay. Repair or replace as necessary.
Greater than 0.9 Check for damaged tone wheel, incorrect sensor
volts AC at one adjustment, excessive tone wheel runnout
tire revolution (> .041"), excessive geared hub input bearing play
per second. and tire size mismatch. Repair or replace as neces-
sary.
Greater than 0.9 Check for damaged tone wheel, incorrect sensor
volts AC at one adjustment, excessive tone wheel runnout
tire revolution (> .041"), excessive geared hub input bearing play
per second. and tire size mismatch. Repair or replace as neces-
sary.
Greater than 0.9 Check for damaged tone wheel, incorrect sensor
volts AC at one adjustment, excessive tone wheel runnout
tire revolution (> .041"), excessive geared hub input bearing play
per second. and tire size mismatch. Repair or replace as neces-
sary.
Greater than 0.9 Check for damaged tone wheel, incorrect sensor
volts AC at one adjustment, excessive tone wheel runnout
tire revolution (> .041"), excessive geared hub input bearing play
per second. and tire size mismatch. Repair or replace as neces-
sary.
Check/Repair
®