Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-127
Table B-5 A/C Signal Circuits Inspection (For Canvas Top Model, If Equipped)
WIRING DIAGRAM
INSPECTION
1. A/C control module (amplifier) 2. ECM (PCM)
Step Action Yes No
1 Check A/C Signal Circuit.
1) Check voltage at terminal E61-17 with igni-
tion switch ON.
A/C signal circuit specification
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. “YEL/BLK” circuit open or
short, Evaporative tem-
perature is below 1°C
(34°F) or faulty A/C sys-
tem.
2 Check A/C Cut Signal Circuit.
1) Check voltage at terminal E61-8.
A/C cut signal specification
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. “GRY/WHT” or “GRY/YEL”
circuit open or short, Poor
performance of ECT sen-
sor, 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.