Suzuki Swift Sport 2004 Service & Repair Manual page 1004

7B-56 Air Conditioning System: Automatic Type
DTC Troubleshooting
Step
1 Position sensor power supply circuit check
1) Disconnect air flow control actuator connector.
2) Check for proper connection to air flow control actuator
at "WHT", "WHT/BLU" and "ORN" wire terminals.
3) If OK, measure voltage between "WHT" wire terminal of
air flow control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 4 – 6 V?
2 Position sensor power supply circuit check
1) Disconnect temperature control actuator connector with
ignition switch turned OFF.
2) Measure voltage between "WHT" wire terminal of air flow
control actuator connector and vehicle body ground with
ignition switch turned ON.
Is voltage 4 – 6 V?
3 Position sensor power supply circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at "G52-1", "G52-3" and "G52-14" terminals.
3) If OK, measure resistance between "WHT" wire terminal
of air flow control actuator connector and "G52-1"
terminal of HVAC control module connector.
Is resistance below 5
4 Position sensor power supply circuit check
1) Measure resistance between "WHT" wire terminal of air
flow control actuator connector and vehicle body ground.
Is resistance infinity?
5 Position sensor power supply circuit check
1) Measure voltage between "WHT" wire terminal of air flow
control actuator connector and vehicle body ground with
ignition switch turned ON.
Is voltage 0 V?
6 Position sensor signal circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure voltage between "WHT/BLU" wire terminal of
air flow control actuator connector and vehicle body
ground with ignition switch turned ON.
Is voltage 4 – 6 V?
7 Position sensor signal circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Measure resistance between "WHT/BLU" wire terminal
of air flow control actuator connector and "G52-14"
terminal of HVAC control module connector.
Is resistance below 5
Action
Ω
?
Ω
?
Yes
Go to Step 6.
Temperature control
actuator faulty.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 10.
Go to Step 8.
No
Go to Step 2.
Go to Step 3.
"WHT" wire open or
high resistance circuit.
"WHT" wire shorted to
ground circuit.
"WHT" wire shorted to
other circuit.
Go to Step 7.
"WHT/BLU" wire open
or high resistance
circuit.