Suzuki SX4 Service Manual page 509

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DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Turn ignition switch to ON position for 10 seconds.
3) Check DTC.
Troubleshooting
Step
1
Was "4WD control system check" performed?
2
Coupling air temperature sensor circuit check
1) Disconnect connector from coupling air temperature
sensor with ignition switch turned OFF.
2) Check for proper connection to "BRN" and "ORN"
terminals of coupling air temperature sensor connector.
3) If connection is OK, measure voltage between "BRN"
terminal of coupling air temperature sensor connector
and vehicle body ground with ignition switch turned ON.
Is it 4 – 6 V?
3
Coupling assembly ground circuit check
1) Disconnect connector from 4WD control module with
ignition switch turned OFF.
2) Measure resistance between "ORN" terminal of coupling
air temperature sensor connector and "G26-24" terminal
of 4WD control module connector with ignition switch
turned OFF.
Is resistance below 5
4
Coupling air temperature sensor check
1) Check coupling air temperature sensor referring to
"Coupling Air Temperature Sensor Inspection".
Is it in good condition?
5
Coupling assembly circuit check
1) Disconnect connector from 4WD control module with
ignition switch turned OFF.
2) Check for proper connection to "G26-25" and "G26-24"
terminals of 4WD control module connector.
3) If connection is OK, measure resistance between "G26-
25" terminal of 4WD control module connector and
vehicle body ground.
Is resistance below 5
Action
?
?
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Substitute a known-
good 4WD control
module and recheck.
"BRN" wire is open or
high resistance circuit.
Differential:
3B-20
No
Go to "4WD Control
System Check".
Go to Step 5.
"ORN" wire is open or
high resistance.
Replace coupling air
temperature sensor.
Substitute a known-
good 4WD control
module and recheck.

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