Ctis Exhaust Valve Inoperative - Hummer H1 Service Manual

12-54 Electrical System
Step
1 Disconnect exhaust solenoid. Using a DVOM set
to measure voltage, probe the light green
wire(CKT47) with the positive lead, and the black
wire(CKT57) with the negative lead. Ignition on,
move the compressor switch to deflate. Is voltage
present?
2 Check continuity to ground on the black
wire(CKT57) at the exhaust solenoid. Is resis-
tance below specification?
3 Remove compressor switch. Using a DVOM set
to measure voltage, check for voltage at both
orange wires (CKT640). With ignition on is volt-
age present?
4 Using a DVOM set to measure voltage, check for
voltage at the light green wire(CKT47) with the
ignition on and compressor switch to deflate. Is
voltage present?
4-1-00
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CTIS Exhaust Valve Inoperative

Action Value(s) Yes
12v Replace exhaust
solenoid.
<.2 Ω
Go to step 3.
12v Go to step 4.
12v Repair open bad
connection or
short in CKT 47
between com-
pressor switch
and exhaust
solenoid.
®
No
Go to step 2.
Repair open or
bad connection
in CKT57
between exhaust
solenoid and
G2.
Repair open,
bad connection
or short in
CKT640
between com-
pressor switch
and fuse 1G.
Replace com-
pressor switch.