2006 SUZUKI SX4 check engine

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Visual InspectionS6RW0D3204004
Check the following parts and systems visually.
DTC CheckS6RW0D3204005
1) Turn ignition switch to OFF position.
2) Connect SUZUKI scan tool to data link connector
(DLC) (1) located on underside of instrument panel.
Special tool
(A): SUZUKI scan tool
3) Turn ignition switch to ON position.
4) Read DTC according to instructions displayed on
SUZUKI scan tool and print it or write it down. Refer
to SUZUKI scan tool operator’s manual for further
details.
If communication between SUZUKI scan tool and
4WD control module is not possible, check if
SUZUKI scan tool is communicable by connecting it
to 4WD control module in another vehicle. If
communication is possible in this case, SUZUKI
scan tool is in good condition. Then check data link
connector and serial data line (circuit) in the vehicle
with which communication was not possible.
5) After completing the check, turn ignition switch OFF
and disconnect SUZUKI scan tool from data link
connector (DLC).
DTC ClearanceS6RW0D3204006
1) Turn ignition switch to OFF position.
2) Connect SUZUKI scan tool to data link connector
(DLC) (1) located on underside of instrument panel.
Special tool
(A): SUZUKI scan tool
3) Turn ignition switch to ON position.
4) Erase DTC according to instructions displayed on
SUZUKI scan tool. Refer to SUZUKI scan tool
operator’s manual for further details.
5) After completing clearance, turn ignition switch OFF
and disconnect SUZUKI scan tool from data link
connector (DLC).
6) Perform “DTC Check” and confirm that NO CODES
is displayed.
NOTE
DTC stored in 4WD control module memory
are also cleared in the following cases. Be
careful not to clear them before keeping their
record.
• When power to 4WD control module is cut
off (by disconnecting battery cable,
removing fuse or disconnecting 4WD
control module connectors).
• When the same malfunction (DTC) is not
detected again during 40 engine warm-up
cycles.

Inspection Item Referring
• Rear differential oil ---- level, leakage “Rear Differential Oil Change”
• Transfer gear oil ---- level, leakage “Transfer Oil Change in Section 3C”
• Manual transmission oil ---- level, leakage “Manual Transaxle Oil Change in Section 5B”
• Rear differential mounting(s) ---- wear and looseness
• Fuses ---- burning
• Battery ---- fluid level, corrosion of terminal “Battery Inspection in Section 1J”
• Connectors of electric wire harness ---- disconnection,
friction“Intermittent and Poor Connection Inspection in Section
00”
• Other parts that can be checked visually
1(A)I5RW0A320008-011(A)I5RW0A320008-01

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-14
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”.

Downloaded from www.Manualslib.com manuals search engine 3B-15 Differential:
4WD Position Indicator Does Not Come ON at Ignition Switch ON but Engine StopsS6RW0D3204013
Wiring Diagram
Circuit Description
4WD position indicator operates according to the signal from 4WD control module. If the 4WD control system is in
good condition, 4WD position indicator light up for 2 seconds when ignition switch is turned to ON position, and then
turned to OFF position. If an abnormality is detected in the system, 4WD position indicator remains lighting.
Troubleshooting
WHTYELRED/BLK
12
WHT/RED
WHT/RED
G26-12
G26-11
RED
BLK
WHT 56 47
12V
G26-10BLK
G26-22
G26-23REDWHT
3
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]
I7RW01320004-01
[A]: 4WD control module connector “G26” (viewed from harness side) 4. Combination meter
1. Main fuse box 5. 4WD AUTO indicator
2. Junction block assembly 6. 4WD LOCK indicator
3. “METER” fuse 7. 4WD control module
Step Action Yes No
14WD position indicator power supply check
1) Turn ignition switch to ON position.
Do other indicators come ON?Go to Step 2. Go to Step 3.
2Check DTC
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch to ON position and check DTC.
Is there DTC(s) U0073, U0100, U0121 and/or U0155?Go to applicable DTC
diag. flow.Substitute a known-
good combination meter
and recheck. If 4WD
position indicator still
remains off, substitute a
known-good 4WD
control module and
recheck.

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-16
4WD Position Indicator Remains ON Steady at Ignition Switch ONS6RW0D3204014
Wiring Diagram
Refer to “4WD Position Indicator Does Not Come ON at Ignition Switch ON but Engine Stops”.
Circuit Description
Transfer position indicator operates according to the signal from 4WD control module. If the 4WD control system is in
good condition, 4WD position indicator light up for 2 seconds when ignition switch is turned to ON position, and then
turned to OFF position. If an abnormality is detected in the system, 4WD position indicator remains lighting.
Troubleshooting3CAN communication circuit check
1) Check CAN communication circuit between combination
meter and 4WD control module referring to “DTC U0073:
Control Module Communication Bus Off”.
Is CAN communication circuit in good condition?Go to Step 4. Repair or replace.
4“METER” fuse check
1) Turn ignition switch to OFF position.
2) Check for fuse blown to “METER” fuse in junction block
assembly.
Is “METER” fuse in good condition?Go to Step 5. Replace “METER” fuse
and check for short.
5Combination meter power supply check
1) Remove combination meter referring to “Combination
Meter Removal and Installation in Section 9C”.
2) Check proper connection to “WHT/RED” and “BLK” wire
terminal of combination meter connector.
3) If OK, then turn ignition switch to ON position and
measure voltage between “WHT/RED” wire terminal of
combination meter connector and vehicle body ground.
Is it 10 – 14 V?Go to Step 6. “WHT/RED” wire is
open circuit.
6Combination meter ground circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between “BLK” wire terminal of
combination meter connector and vehicle body ground.
Is resistance 1
Ω or less?Substitute a known-
good combination meter
and recheck. If 4WD
position indicator still
remains OFF, substitute
a known-good 4WD
control module and
recheck.“BLK” wire is open or
high resistance circuit. Step Action Yes No
Step Action Yes No
1Check DTC
1) Check DTC referring to “DTC Check”.
Is there any DTC(s)?Perform DTC flow to
repair and retry.Go to Step 2.
2CAN communication circuit check
1) Check CAN communication circuit between combination
meter and 4WD control module referring to “DTC U0073:
Control Module Communication Bus Off”.
Is CAN communication circuit in good condition?Substitute a known-
good combination meter
and recheck. If 4WD
position indicator still
remains off, substitute a
known-good 4WD
control module and
recheck.Repair or replace.

Downloaded from www.Manualslib.com manuals search engine 3B-17 Differential:
DTC C1240: 4WD Control Module Power Supply Circuit MalfunctionS6RW0D3204015
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) 3. “4WD” fuse
1. 4WD control module 4. Main fuse box
2. “IG COIL” fuse
DTC detecting condition Trouble area
4WD control module power supply voltage is out of specification. 4WD control module power supply circuit
5V
5V
G26-12
G26-11
G26-10BLK
WHT/RED
RED/BLK
1
2
3
4
YEL
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]
I7RW01320005-01
Step Action Yes No
1Was “4WD control system check” performed?Go to Step 2. Go to “4WD Control
System Check”.
24WD control module power circuit check
1) Disconnect 4WD control module connector with ignition
switch OFF.
2) Check for proper connection to “G26” terminal of 4WD
control module connector.
3) If connection is OK, measure voltage between “G26-11”
terminal of 4WD control module connector and vehicle
body ground with ignition switch ON.
Is it 10 – 14 V?Poor “G26-11”
connection or
intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. If wire and
connections are OK,
substitute a known-
good 4WD control
module and recheck.“4WD” fuse blown,
“WHT/RED” or “YEL”
wire is circuit open or
circuit short.

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-18
DTC C1243: Internal Circuit Malfunction of 4WD Control ModuleS6RW0D3204016
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Start engine and run it for 10 seconds. or more.
3) Stop vehicle and check DTC.
Troubleshooting
Substitute a known-good 4WD control module and recheck.3Ground circuit check
1) Turn ignition switch to OFF position.
2) Check for proper connection to “G26-10” terminal of
4WD control module connector.
3) If OK, measure resistance between “G26-10” terminal of
4WD control module connector and vehicle body
ground.
If resistance 1
Ω or less?Substitute a known-
good 4WD control
module and recheck.Repair ground circuit. Step Action Yes No
DTC detecting condition Trouble area
Internal power supply malfunction of 4WD control module 4WD control module

Downloaded from www.Manualslib.com manuals search engine 3B-19 Differential:
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

Downloaded from www.Manualslib.com manuals search engine Differential: 3B-20
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.