Dtc C1252: Coupling Assembly Circuit Open - Suzuki 2006 SX4 Service Manual

Step
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 above 1 M
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 above 1 M

DTC C1252: Coupling Assembly Circuit Open

Wiring Diagram
[A]
[A]: 4WD control module connector "G26" (viewed from harness side)
[B]: Coupling assembly connector "L102" (viewed from harness side)
DTC Detecting Condition and Trouble Area
DTC detecting condition
2WD/4WD switch is changed of 4WD lock position, and then
vehicle is not changed for more than 5 seconds.
Action
Ω
?
Ω
?
1
L102-1
L102-4
12 11 10 9 8 7 6
26 25 24 23 22 21 20
Go to Step 4.
Substitute a known-
good 4WD control
module and recheck.
"BRN" wire is shorted to
ground circuit.
2
12V
GRY G26-3
YEL G26-2
5 4 3 2 1
19
18 17 16 15 14 13
• Coupling assembly
• Coupling assembly circuit
• 4WD control module
Differential:
Yes
"ORN" wire is shorted to
ground circuit.
Replace coupling air
temperature sensor.
Substitute a known-
good 4WD control
module and recheck.
[B]
2 1
1. Coupling assembly
2. 4WD control module
Trouble area
3B-22
No
S6RW0D3204019
I7RW01320007-01