Table B-4 A/C Signal Circuits Check (Vehicle With A/C) - Suzuki Swift User Manual

6-102 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)

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 C03-19.
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 results as specified?
2 Check A/C ON (Output) Signal Circuit.
1) Check voltage at terminal C03-17.
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 results as specified?
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.
A/C control signal
circuits are in good
condition.
NO
D "Bl/R" wire open or
short.
D Poor C03-19
connection.
D Poor A/C amplifier
coupler connection
or faulty A/C
system.
D "Lg/R" wire open or
short.
D Poor performance of
ECT sensor, TP
sensor.
D Engine start signal
inputted or
D Poor C03-17
connection.
If none of the above
exists, substitute a
known-good ECM
(PCM) and recheck.