Ctis Front Inflate Valve Inoperative - Hummer H1 Service Manual

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Step
1 Disconnect front inflate solenoid. Using a DVOM
set to measure voltage connect the positive lead to
the tan wire(CKT91), and the negative lead to the
black wire(CKT57). With the ignition on, selector
switch set to both, and the compressor switch to
inflate, is voltage present?
2 Check continuity to ground on the black
wire(CKT57) at the front inflate solenoid. Is resis-
tance below specification?
3 Remove selector switch and compressor switch
from the I/P. Using a DVOM set to measure volt-
age, ignition on, and compressor switch set to
inflate. Check for voltage on both yellow
wires(CKT144) at rear of selector switch. Is volt-
age present.
4 Ignition on, compressor switch on inflate, check
for voltage on yellow wires(CKT144)at rear of
compressor switch. Is voltage present?
5 Ignition on, check for voltage at both orange
wires(CKT640) at back of compressor switch. Is
voltage present?
6 Ignition on, compressor switch set to inflate,
selector switch set to both. Check for voltage at
the tan wire(CKT91) at the back of the selector
switch. Is voltage present?
05745159

CTIS Front Inflate Valve Inoperative

Action
Electrical System
Value(s) Yes
12v Replace front
inflate solenoid.
<.2 Ω
Go to step 3.
12v Go to step 6.
12v Repair open,
bad connection
or short in
CKT144
between com-
pressor switch
and selector
switch.
12v Replace com-
pressor switch.
12v Repair open,
bad connection,
or short in
CKT91 between
selector switch
and front inflate
valve.
12-55
No
Go to step 2.
Repair open or
bad connection
in CKT57
between front
inflate valve
and G2.
Go to step 4.
Go to step 5.
Repair open,
bad connection
or short in
CKT640
between com-
pressor switch
and fuse 1G.
Replace the
selector switch.
4-1-00