Suzuki Swift User Manual page 259

TABLE B-4 A/C SIGNAL CIRCUITS CHECK (VEHICLE WITH A/C)
A / C
amplifier
INSPECTION
STEP
1 Check A/C (input) Signal Circuit.
1) Check voltage at terminal C02-16. See Fig. 1.
While engine running and A/C
switch and/or heater blower switch
OFF (A/C is not operating)
While engine running and both
A/C switch and heater blower
switch ON (A/C is operating)
Are check result as specified?
2 Check A/C ON (Output) Signal Circuit.
1) Check voltage at terminal C02-1. See Fig. 2.
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)
Are check result as specified?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-103
ACTION
: 10 – 14 V
: About 0 V
: About 0 V
: 10 – 14 V
(A / C ON output signal)
(A / C input signal)
YES
Go to Step 2. "Lg/B" circuit open
or short,
Evaporative
temperature is
1_C (34_F) below
or faulty A/C
system.
A/C control signal "G/R" circuit open
circuits are in good or short, Poor
condition. 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
and recheck.
NO