2006 SUZUKI SX4 AIR

Downloaded from www.Manualslib.com manuals search engine 3B-21 Differential:
DTC C1251: Coupling Air Temperature Sensor Circuit ShortS6RW0D3204018
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Turn ignition switch to ON position for 10 seconds.
3) Check DTC.
Troubleshooting
[A]: 4WD control module connector “G26” (viewed from harness side) 2. 4WD control module
1. Coupling air temperature sensor
DTC detecting condition Trouble area
Input signal from coupling air temperature sensor is lower than
specified value.• Coupling air temperature sensor
• Coupling air temperature sensor circuit
• 4WD control module
2
G26-25
G26-24ORN
BRN
5V
1
1 2 3
4 5
6 7 8 9 10 11
12
13
14 15 16
17 18 19
20
21 22
23
24 25 26
[A]
I7RW01320006-01
Step Action Yes No
1Was “4WD control system check” performed?Go to Step 2. Go to “4WD Control
System Check”.
2Coupling 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?Go to Step 3. Go to Step 5.

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-22
DTC C1252: Coupling Assembly Circuit OpenS6RW0D3204019
Wiring Diagram
DTC Detecting Condition and Trouble Area3Coupling 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
Ω?Go to Step 4. “ORN” wire is shorted to
ground circuit.
4Coupling air temperature sensor check
1) Check coupling air temperature sensor referring to
“Coupling Air Temperature Sensor Inspection”.
Is it in good condition?Substitute a known-
good 4WD control
module and recheck.Replace coupling air
temperature sensor.
5Coupling 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
Ω?“BRN” wire is shorted to
ground circuit.Substitute a known-
good 4WD control
module and recheck. Step Action Yes No
12V
G26-3
YEL GRY
G26-2
L102-1
L102-4 12
1 2 3
4 5
6 7 8 9 10 11
12
13
14 15 16
17 18 19
20
21 22
23
24 25 26
[A]
21
[B]
I7RW01320007-01
[A]: 4WD control module connector “G26” (viewed from harness side) 1. Coupling assembly
[B]: Coupling assembly connector “L102” (viewed from harness side) 2. 4WD control module
DTC detecting condition Trouble area
2WD/4WD switch is changed of 4WD lock position, and then
vehicle is not changed for more than 5 seconds.• Coupling assembly
• Coupling assembly circuit
• 4WD control module

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-26
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Select 2WD/4WD switch to “2WD” position and keep its position for 10 seconds. Similarly select 2WD/4WD switch
to “AUTO” and “LOCK” position.
3) Check DTC.
TroubleshootingDTC detecting condition Trouble area
2WD/4WD switch combination different from specification is
detected for more than 5 seconds.• 2WD/4WD switch
• 2WD/4WD switch circuit
• 4WD control module
Step Action Yes No
1Was “4WD control system check” performed?Go to Step 2. Go to “4WD Control
System Check”.
22WD/4WD switch circuit check
1) Disconnect 2WD/4WD switch connector “L174” with
ignition switch turned OFF.
2) Check for proper connection to “L174-1” and “L174-5”
terminals of 2WD/4WD switch connector.
3) If connection is OK, measure voltage between “L174-1”
terminal or “L174-5” terminal of 2WD/4WD switch
connector and vehicle body ground.
Is it 10 – 14 V?Go to Step 3. Go to Step 5.
32WD/4WD switch ground circuit check
1) Measure resistance between “L174-4” terminal of 2WD/
4WD switch connector and vehicle body ground with
ignition switch turned OFF.
Is resistance below 5
Ω?Go to Step 4. “BLK/ORN” wire is
shorted to ground.
42WD/4WD switch check
1) Check 2WD/4WD switch referring to “2WD/4WD Switch
Inspection”.
Is it in good condition?Substitute a known-
good 4WD control
module and recheck.Replace 2WD/4WD
switch.
52WD/4WD switch circuit check
1) Disconnect connector from 4WD control module
connector “G26” with ignition switch turned OFF.
2) Check for shorted to ground in related circuits.
• Between “G26-13” terminal of 4WD control module
connector and “L174-1” terminal of 2WD/4WD switch
connector.
• Between “G26-14” terminal of 4WD control module
connector and “L174-5” terminal of 2WD/4WD switch
connector.
Are they in good condition?Substitute a known-
good 4WD control
module and recheck.Repair circuit.

Downloaded from www.Manualslib.com manuals search engine 3B-29 Differential:
Reference waveform No.1
Coupling assembly signalReference waveform No.2
CAN communication signal G26-24 ORNCoupling air
temperature sensor
(ground)About 2.5 V Ignition switch turned ON position
G26-25 BRNCoupling air
temperature sensor
(power)About 2.5 V Ignition switch turned ON position
G26-26 — — — — Terminal
NumberWire Color CircuitNormal
Vo l ta g eCondition
Measurement terminal CH1: “G26-3” to “G26-2”
Oscilloscope setting CH1: 5 V / DIV
TIME: 400 µs / DIV
Measurement condition • Run engine at idle speed
and 2WD/4WD switch at
4WD lock position
• Selector lever at other than
“P” or “N” range (A/T model)
• Depress accelerator pedal
(M/T model)
I7RW01320011-01
Measurement terminal CH1: “G26-22” to “G26-10”
CH2: “G26-23” to “G26-10”
Oscilloscope setting CH1: 1 V / DIV, CH2: 1 V / DIV
TIME: 400 µs / DIV
Measurement condition Ignition switch ON position
1. CAN communication line signal (high)
2. CAN communication line signal (low)
I7RW01320012-01

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-30
Repair Instructions
Rear Differential Oil Level CheckS6RW0D3206001
1) Lift up vehicle and check oil leakage. Repair leaky
point, if any.
2) Remove oil level / filler plug (1) and check oil
contamination and oil level is lower end of oil level /
filler plug hole (2).
If oil is excessive dirty or insufficient, replace oil or
pour specified oil up to plug hole.
3) Apply sealant to thread of level / filler plug, and then
tighten it to specified torque.
“A”: Sealant 99000–31260 (SUZUKI Bond
No.1217G)
Tightening torque
Differential oil level / filler plug (a): 23 N·m (2.3
kgf-m, 17.0 lb-ft)
Rear Differential Oil ChangeS6RW0D3206002
1) Before changing or inspecting oil, be sure to stop
engine and lift vehicle horizontally.
2) With vehicle lifted up, check leakage.
If leakage exists, correct it.
NOTE
Whenever vehicle is hoisted for any other
service work than oil change, also be sure to
check for oil leakage.

3) Remove oil filler plug (2).
4) Remove drain plug (1), and drain old oil.
5) Apply sealant to thread of drain plug (1), and tighten
it to specified torque.
“A”: Sealant 99000–31260 (SUZUKI Bond
No.1217G)Tightening torque
Differential oil drain plug (a): 23 N·m (2.3 kgf-m,
17.0 lb-ft)
6) Pour new specified oil until oil level reaches bottom
of oil filler plug hole (3) as shown in figure.
NOTE
• Hypoid gear oil must be used for
differential.
• It is highly recommended to use API GL-5
80W-90 gear oil.

Differential oil specification
: API GL-5 (For SAE classification, refer to
viscosity chart [A] in figure.)
Rear differential oil capacity
Reference: 0.7 – 0.9 liters (1.5/1.2 – 1.9/1.6 US/
Imp. pt.)
7) Apply sealant to thread of level / filler plug, and then
tighten it to specified torque.
“A”: Sealant 99000–31260 (SUZUKI Bond
No.1217G)
Tightening torque
Differential oil level / filler plug (b): 23 N·m (2.3
kgf-m, 17.0 lb-ft)
I5RW0A320015-01
I5RW0A320016-02

Downloaded from www.Manualslib.com manuals search engine 3B-31 Differential:
2WD/4WD Switch Removal and InstallationS6RW0D3206003
Removal
1) Disconnect negative cable at battery.
2) Remove console box (2).
3) Remove 2WD/4WD switch (1) from console box.
Installation
Reverse removal procedure for installation.
2WD/4WD Switch InspectionS6RW0D3206004
Check 2WD/4WD switch for continuity between
terminals at each switch position.
If check result is not as specified, replace switch.
4WD Control Module Removal and InstallationS6RW0D3206005
Removal
1) Disconnect negative cable at battery.
2) Remove center ventilation louver referring to “Center
Ventilation Louver Removal and Installation in
Section 7A”.
3) Disconnect connector (1) from 4WD control module.
4) Remove 4WD control module (2).
Installation
Reverse removal procedure for installation.
Coupling Air Temperature Sensor Removal and
Installation
S6RW0D3206006
Removal
1) Dismount rear differential referring to “Rear
Differential Dismounting and Remounting”.
2) Remove coupling air temperature sensor (1) from
rear differential (2).
Installation
Reverse removal procedure for installation, noting the
following point.
• Tighten coupling air temperature sensor to specified
torque.
Tightening torque
Coupling air temperature sensor: 18 N·m (1.8 kgf-
m, 13.0 lb-ft)
1
2
I5RW0A320017-02
Terminal
Switch position
2WD
AUTO
LOCK
11
22
3 3
4 4
5 5
I5RW0A320018-02
2
1
I5RW0A320019-01
12
I5RW0A320020-02

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-32
Coupling Air Temperature Sensor InspectionS6RW0D3206007
CAUTION!
Do not heat up coupling air temperature
sensor more than 100 °C (212 °F). Otherwise,
coupling air temperature sensor will be
damaged.

• Blow hot air to temperature sensing part (2) of
coupling air temperature sensor (3) using hot air drier
(4) and measure resistance between sensor terminals
while heating air gradually.
If measured resistance does not show such
characteristic as shown, replace air temperature
sensor.
Coupling Assembly InspectionS6RW0D3206008
• Check coupling assembly for oil leakage. If leakage
exists, replace it.
• Measure resistance between “a” terminal and “b”
terminal of coupling connector (1).
If measured resistance is out of specification, check
harness for open or short.
If OK, replace coupling assembly.
Coupling assembly resistance
: 2 – 3 Ω
[A]: Lower limit [D]: Resistance
[B]: Normal [E]: Temperature
[C]: Upper limit 1. Temperature gauge
020
32 68 17680 (6.00)
(0.34) (2.56)
1
4
23
[D]
[C]
[B]
[A]
[E]
I5RW0A320021-01
1
“a” “b”I5RW0A320064-01

Downloaded from www.Manualslib.com manuals search engine 3B-35 Differential:
Rear Differential ComponentsS6RW0D3206013
4 5
9
2
30
6
(a)13
12
(a)
3
A
3A
141617 2118
29
3A
1(b)
22
1217G
101217G
11
8OIL
15OIL
19 20OIL
23OIL
25OIL27OIL
27OIL
25OIL
19OIL18
26 28
OIL
26OIL23OIL
24OIL
(c)
14
7
I5RW0A320026-02
1. Flange nut 13. Differential cover bolt 25. Differential gear
2. Companion flange 14. Spacer 26. Spring washer
3. Oil seal
: Apply grease 99000-25010 to oil seal lip.15. Rear bearing 27. Thrust washer
4. Coupling front bearing 16. Shim 28. Pinion shaft
5. Coupling case
: Apply sealant 99000-31260 to mating surface of carrier and coupling
case.17. Bevel pinion 29. Pinion shaft pin
6. Coupling assembly
: Never disassemble.18. Shim 30. Coupling case bolt
7. Snap ring 19. Differential side bearing : 23 N⋅m (2.3 kgf-m, 17.0 lb-ft)
8. Bevel pinion nut
: Tighten nut so as rotation torque of bevel pinion to be in specified value.20. Bevel gear : 125 N⋅m (12.5 kgf-m, 90.5 lb-ft)
9. Front bearing 21. Differential case : 78 N⋅m (7.8 kgf-m, 56.5 lb-ft)
10. Differential carrier
: Apply sealant 99000-31260 to mating surface of carrier and rear cover.22. Bevel gear bolt : Do not reuse.
11. Coupling air temperature sensor 23. Pinion washer : Apply differential oil.
12. Differential cover 24. Pinion