Suzuki GA413 Service Manual page 874

6-98 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TABLE B-5 A/C SIGNAL CIRCUITS CHECK (VEHICLE WITH A/C)
SYSTEM DESCRIPTION
A/C control module transmits "A/C signal" to ECM when A/C ON conditions are satisfied on the A/C control module
side.
ECM transmits "A/C ON signal" to A/C control module when "A/C signal" inputted to ECM and A/C ON conditions
are satisfied on the ECM side. Then, A/C is operated.
INSPECTION
STEP
1 Did you perform "ENGINE DIAGNOSTIC FLOW
TABLE" in Section 6?
2 Check A/C signal circuit.
1) Disconnect ECM connectors and A/C control
module connector with ignition switch OFF.
2) Check "GRY", "GRY/WHT" and "BRN/BLK"
wires for open or short.
Are "GRY", "GRY/WHT" and "BRN/BLK" wires in
good condition?
ACTION YES
Go to Step 2.
Intermittent trouble
Check for intermittent re-
ferring to "Intermittent
and Poor Connection" in
Section 0A.
1. A/C control module
2. A/C control module connector
3. ECM connector
4. ECM
NO
Go to "ENGINE DIAG-
NOSTIC FLOW TABLE".
"GRY", "GRY/WHT" and
"BRN/BLK" wire open or
shorted to ground or
poor connection at L20-6
and L20-30.
Faulty A/C control mod-
ule.
If OK, substitute a
known-good ECM and
recheck.