O2 sensor SUZUKI SX4 2006 1.G Service Workshop Manual

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DTC TableS6RW0D3204007
NOTE
“O” in transfer position indicator column of the above table means indicator lights up when DTC is
detected.

Fail-Safe TableS6RW0D3204008
This function is provided by the safe mechanism that assures safe driveability even when the coupling assembly,
switch, sensor or its circuit fails. The following table shows the fail safe function for each fail condition of sensor,
coupling assembly, switch, 4WD control module or its circuit. DTC No. Detecting itemDetecting condition
(DTC will set when detecting)4WD
position
Indicator
) C12404WD control module power
supply circuit malfunctionBattery voltage is lower than lower limit voltage for
4WD control module diagnosis.{
) C1243Internal circuit malfunction of
4WD control moduleInternal power supply malfunction of 4WD control
module{
) C1250Coupling air temperature sensor
openSensor output voltage too high{
) C1251Coupling air temperature sensor
shortSensor output voltage too low{
) C1252 Coupling assembly open2WD/4WD switch is changed of 4WD lock position,
and then vehicle is not changed for more than 5
seconds.{
) C1253 Coupling assembly short2WD/4WD switch is changed of 4WD lock position,
and then vehicle is not changed for more than 5
seconds.{
) C1254 2WD/4WD switch malfunctionDifferent switch combination from specification is
detected more than 5 seconds.{
) U0073Control module communication
bus offTransmitting and receiving error of 4WD control
module for specified time continuously{
) U0100 Lost communication with ECMReceiving error of 4WD control module from ECM
for specified time continuously{
) U0121Lost communication with ABS /
ESP® control moduleReceiving error of 4WD control module from ABS /
ESP® control module for specified time
continuously{
) U0155Lost communication with
instrument panel cluster control
moduleReceiving error of 4WD control module from
combination meter for specified time continuously{
DTC No. Trouble Area Fail-Safe Operation
)C12404WD control module power supply circuit
malfunction4WD control module controls the current and
fixed the vehicle to 2WD position.
)C1243Internal circuit malfunction of 4WD control
module
)C1250 Coupling air temperature sensor open
)C1251 Coupling air temperature sensor short
)C1252 Coupling assembly open
)C1253 Coupling assembly short
)C1254 2WD/4WD switch malfunction
)U0073 Control module communication bus off
)U0100 Lost communication with ECM
)U0121Lost communication with ABS / ESP® control
module
)U0155Lost communication with instrument panel
cluster control module

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Scan Tool DataS6RW0D3204009
Scan Tool Data Definitions
Accel pedal Pos (Accelerator pedal position) (%)
Accelerator pedal opening ratio detected by signal on
CAN communication line fed from ECM.
Engine Speed (RPM)
This parameter indicates engine revolution calculated by
4WD control module.
4WD mode (2WD / AUTO / LOCK / ABS mode / Yaw
cont / ESP® req)
This parameter indicates 4WD mode according to 2WD/
4WD switch signal status detected by 4WD control
module.
4WD current (A)
This parameter indicates input current of coupling
assembly.
Battery voltage (V)
This parameter indicates battery voltage detected by
4WD control module.Coupling temp (°C, °F)
Coupling temperature detected by coupling air
temperature sensor installed in coupling assembly.
Wheel speed (F), Wheel speed (R) (km/h, mph)
Wheel speed is an ABS / ESP® control module internal
parameter. It is computed by reference pulses from the
wheel speed sensor.
F-R Wheel speed diff (Front-rear wheel speed
differential) (rpm)
This parameter indicates rotation difference between
front wheel and rear wheel detected by 4WD control
module.
4WD duty (%)
This parameter indicates operation rate of coupling
assembly. Scan tool data Vehicle conditionNormal condition / reference
values
) Accel pedal PosIgnition switch ON after
warmed up engineAccelerator pedal released 0 – 5%
Accelerator pedal depressed
fully90 – 100%
) Engine speed At engine idle speed Engine idle speed is display
) 4WD mode2WD/4WD switch selected to 2WD position 2WD
2WD/4WD switch selected to AUTO position AUTO
2WD/4WD switch selected to LOCK position LOCK
ABS operating ABS mode
Ignition switch ON and engine stop Relay off
Stability control operating Yaw cont
ESP® operating ESP® mode
) 4WD current Engine running 0 – 200 mA
) Battery voltage At engine idle speed 10 – 14 V
) Coupling temp Engine running –40 °C – 100 °C (–40 °F – 212 °F)
) Wheel speed (F) Vehicle stop 0 km/h, 0 MPH
) Wheel speed (R) Vehicle stop 0 km/h, 0 MPH
) F-R Wheel speed
DiffVehicle stop 0 rpm
) 4WD dutyIgnition switch ON and 2WD/4WD switch selected to
2WD position0%

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Rear Differential Symptom DiagnosisS6RW0D3204011
4WD Control Symptom DiagnosisS6RW0D3204012
Diagnose 4WD system after performing the following inspections.
• Perform 4WD control system check referring to “4WD Control System Check”. Condition Possible cause Correction / Reference Item
Gear noiseDeteriorated or water mixed lubricantRepair and replenish referring to “Rear
Differential Oil Change”.
Inadequate or insufficient lubricantRepair and replenish referring to “Rear
Differential Oil Change”.
Maladjusted backlash between drive
bevel pinion and gearAdjust as prescribed referring to “Rear
Differential Disassembly and Reassembly”.
Improper tooth contact in the mesh
between drive bevel pinion and gearAdjust or replace referring to “Rear Differential
Disassembly and Reassembly”.
Loose drive bevel gear securing boltsReplace or retighten referring to “Rear
Differential Disassembly and Reassembly”.
Damaged differential gear(s) or
differential pinion(s)Replace referring to “Rear Differential
Inspection”.
Bearing noise(Constant noise) Deteriorated or water
mixed lubricantRepair and replenish referring to “Rear
Differential Oil Change”.
(Constant noise) Inadequate or
insufficient lubricantRepair and replenish referring to “Rear
Differential Oil Change”.
(Noise while coasting) Damaged
bearing(s) of drive bevel pinionReplace referring to “Rear Differential
Inspection”.
(Noise while turning) Damaged
differential side bearing(s) or axle
bearing(s)Replace referring to “Rear Differential
Inspection”.
Oil leakageClogged breather plugClean.
Worn or damaged oil sealReplace.
Excessive oilAdjust oil level referring to “Rear Differential Oil
Change”.
Loose differential carrier boltsReplace or retighten.
Condition Possible cause Correction / Reference Item
4WD system does not
operate2WD/4WD switch faultyCheck switch referring to “2WD/4WD Switch
Inspection”.
Coupling air temperature sensor faultyCheck coupling air temperature sensor
referring to “Coupling Air Temperature Sensor
Inspection”.
Coupling assembly faultyCheck coupling assembly referring to
“Coupling Assembly Inspection”.
Wiring or grounding faultyRepair as necessary.
4WD control module faultyCheck 4WD control module referring to
“Inspection of 4WD Control Module and Its
Circuits”.
MAF sensor faultyCheck MAF sensor and its circuit.
Accelerator pedal position (APP) sensor
faultyCheck accelerator pedal position (APP) sensor
and its circuit.
CKP sensor faultyCheck CKP sensor and its circuit.
Front and/or rear wheel speed sensor
faultyCheck front and/or rear wheel speed sensor
and its circuit.
Steering angle sensor faultyCheck steering angle sensor and its circuit.
ABS / ESP® control module faultyCheck ABS / ESP
® control module and its
circuit.
ECM faultyCheck ECM and its circuit.
NoiseDamaged or worn bearing(s)Refer to “Rear Differential Inspection”.

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DTC C1250: Coupling Air Temperature Sensor Circuit OpenS6RW0D3204017
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.
[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 higher 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

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Troubleshooting
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.
3Coupling 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
Ω?Go to Step 4. “ORN” wire is open or
high resistance.
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 below 5
Ω?“BRN” wire is open or
high resistance circuit.Substitute a known-
good 4WD control
module and recheck.

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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.

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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

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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

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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

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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