Hummer H1 Service Manual page 476

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Ignition key "OFF" to test system (except where noted)
Fault Code Problem Area
3-3 Open circuit
between ECU
and left front
outlet solenoid
valve or wiring.
3-4 Open circuit
between ECU
and right rear
inlet solenoid
valve or wiring.
3-5 Open circuit
between ECU
and right rear
outlet solenoid
valve or wiring.
3-6 Open circuit
between ECU
and left rear
inlet solenoid
valve or wiring.
3-7 Open circuit
between ECU
and left rear
outlet solenoid
valve or wiring.
3-8 Open circuit
between ECU
and RCP relay
1.
3-9 Open circuit
between ECU
and RCP relay
2.
4-0 Short circuit to
ground between
ECU and right
front inlet sole-
noid valve.
4-1 Short circuit to
ground between
ECU and right
front outlet
solenoid valve.
05745159
Fault Code List
Test Pin
Values
Locations
3.0-5.0 W
24 and 27
5.0-7.5 W
4 and 27
3.0-5.0 W
5 and 27
5.0-7.5 W
21 and 27
3.0-5.0 W
22 and 27
11 and 27 Ignition "ON"
30 and 27 approximate
battery +
voltage.
12 and 27 Ignition "ON"
approximate
battery +
voltage.
5.0-7.5 W
6 and 27
3.0-5.0 W
7 and 27
Brake System
Check/Repair
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 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 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 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 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.
If pump does not run, check wiring from pin 11.
If pump does not run, check wiring from pin 12.
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
Check electrical resistance of affected valve wir-
ing to ground at ECU connector and at modulator
assembly as necessary.
7-37