Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 109 / 729

YH4
GRAND
VITARA
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-105
A/C
control
module
(amplifier)
TABLE B-5 A/C SIGNAL CIRCUITS INSPECTION (IF EQUIPPED)
WIRING DIAGRAM
INSPECTION
STEP ACTION YES NO
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):
10 – 14 V
Both A / C switch and heater
blower switch ON:
0 – 1.5 V
Are check result as specified?
Go to Step 2. “Y / B” circuit open or
short, Evaporative
temperature is below
1
_
C (34
_
F) or faulty
A / C system.
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):
0 – 1.5 V
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 signal
circuits are in good
condition. “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.