Hummer H1 Service Manual page 479

7-40 Brake System
Fault Code Problem Area
5-5 Short circuit to
battery between
ECU and right
rear outlet
valve solenoid
or wiring.
5-6 Short circuit to
battery between
ECU and left
rear inlet valve
solenoid or wir-
ing.
5-7 Short circuit to
battery between
ECU and left
rear outlet
valve solenoid
or wiring.
5-8 Short circuit to
battery +
between ECU
and RCP relay
1.
5-9 Short circuit to
battery +
between ECU
and RCP relay
2.
5-12
Right front
wheel speed
signal is erratic.
5-13 Left rear wheel
speed signal is
erratic.
5-14 Left front
wheel speed
signal is erratic.
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Ignition key "OFF" to test system (except where noted)
Test Pin
Locations
5 and 27
21 and 27
22 and 27
11 and 27
12 and 27
17 and 34
18 and 35
15 and 32
Fault Code List
Values
0 volts Check voltages at wiring harness including con-
3.0-5.0 W
nectors. Check electrical resistance of affected
valve wiring to ground at ECU connector and at
modulator assembly plug. Repair wiring or
replace as necessary.
0 volts Check voltages at wiring harness including con-
5.0-7.5 W
nectors. Check electrical resistance of affected
valve wiring to ground at ECU connector and at
modulator assembly plug. Repair wiring or
replace as necessary.
0 volts Check voltages at wiring harness including con-
3.0-5.0 W
nectors. Check electrical resistance of affected
valve wiring to ground at ECU connector and at
modulator assembly plug. Repair wiring or
replace as necessary.
0 volts Check wiring harness between ECU and relay and
pump ground connections. Repair wiring as nec-
essary.
0 volts Check wiring harness between ECU and relay and
pump ground connections. Repair wiring as nec-
essary.
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
®