Suzuki Wagon R Manual page 1190

6-1-98 GENERAL INFORMATION AND ENGINE DIAGNOSIS
STEP
3 1) Check voltage at E21-23 terminal under each
condition given in table below.
While engine running,
A/C switch OFF
While engine running,
A/C switch ON
NOTE:
When A/C evaporator thermistor temp. is
below 2.5_C (36.5_F), A/C remain OFF (E21-23
terminal voltage become 0 – 1 V). This
condition is not abnormal.
2) Is check result satisfactory?
Fig. 1 for Step 1
ACTION
0 V
10 – 14V
Temperature
YES
A/C control system
circuits are in good
condition.
NO
D "ORN" or
"BLU/YEL" wire
open or short
D Poor E21-23
terminal connection
If wire and connection
are OK, substitute a
known-good ECM and
recheck.