Suzuki 2000 Grand Vitara SQ625 Service Manual page 109

TABLE B-5 A/C SIGNAL CIRCUITS INSPECTION (IF EQUIPPED)
WIRING DIAGRAM
INSPECTION
STEP
1 Check A/C Signal Circuit.
1) Check voltage at terminal E61-17 with
ignition switch ON.
A/C switch and/or heater
blower switch OFF
(A/C is not operating):
Both A/C switch and heater
blower switch ON:
Are check result as specified?
2 Check A/C Cut Signal Circuit.
1) Check voltage at terminal E61-8.
While engine running and
A/C switch and/or heater
blower switch OFF
(A/C is not operating):
While engine running at
idle speed and both A/C
switch and heater blower
switch ON (A/C is operating): 10 – 14 V
Are check result as specified?
A/C
control
module
(amplifier)
ACTION
10 – 14 V
0 – 1.5 V
0 – 1.5 V
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-105
YES
Go to Step 2.
A/C control signal
circuits are in good
condition.
NO
"Y/B" circuit open or
short, Evaporative
temperature is below
1_C (34_F) or faulty
A/C system.
"Gr/W" or "Gr/Y" circuit
open or short, Poor
performance of ECT
sensor, TP sensor,
Engine start signal
inputted or A/C amplifier
malfunction.
If none of the above
exists, substitute a
known-good ECM (PCM)
and recheck.