Suzuki Liana RH418 Supplementary Service Manual page 107

Troubleshooting
WARNING
!
Keep hands, tools, and clothing away from A/C condenser fan to help prevent personal injury. This fan
is electric and can come on whether or not the engine is running. The fan can start automatically in
response to the ECT sensor with the ignition switch in the "ON" position.
Step
1 Check evaporator temp. sensor resistance
1) Disconnect ECM connectors with ignition switch at OFF
position.
2) Check resistance between terminals "C41-10" and "G04-
14" and terminals "G04-11" and "C41-10".
Evaporator temp. sensor resistance
At 0 °C: 6.3 – 6.9 kΩ
At 25 °C: 1.8 – 2.2 kΩ
Is it within specification?
2 Check A/C switch signal
1) Check voltage at terminal "G04-16" under each condition
given as follows.
Voltage at terminal "G04-16"
Ignition switch ON, A/C switch OFF: 10 – 14 V
Ignition switch ON, A/C switch ON and blower motor
switch 1st speed position or more: 0 – 1 V
Is check result satisfactory?
3 Check A/C condenser fan control system
Is A/C cooling fan started when A/C switch and heater
blower switch turned ON?
Action
I2RH01110136-01
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 7.
1A-94
No
Faulty A/C evaporator
temp. sensor or its
circuit.
"GRN/BLK" wire open or
short. Poor "G04-16"
terminal connection.
If wire and connection
are OK, faulty A/C
pressure switch, A/C
control module.
Go to Step 4.