2006 SUZUKI SX4 Can troubleshooting

Downloaded from www.Manualslib.com manuals search engine 1A-168 Engine General Information and Diagnosis:
Troubleshooting
Step Action Yes No
1DTC Check
1) Turn ignition switch to OFF position.
2) Connect scan tool to DLC.
3) Check DTC in the following control modules.
•ECM
•TCM
•BCM
• Keyless start control module
• 4WD control module
Is there any DTC other than CAN-DTC?Go to applicable
troubleshooting of DTC
other than CAN-DTC.Go to Step 2.
2Control module connector check
1) Turn ignition switch to OFF position.
2) Be sure to disconnect scan tool from DLC.
3) Disconnect all the following control module connectors.
• Control modules communicated by CAN
–ECM
–TCM
– ABS control module
–BCM
– Combination meter
– Keyless start control module
– 4WD control module
4) Check for proper connection to terminal of each CAN
line of all control module (communicated by CAN)
connectors.
5) If OK, connect all connectors of control module
communicated by CAN securely.
6) Recheck DTC for all control modules communicated by
CAN.
Is there any CAN-DTC?Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-203
Troubleshooting
Step Action Yes No
1Check A/C condenser fan control system
Is A/C condenser fan started when A/C is operating?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.Go to Step 2.
2Check A/C condenser fan relay and its circuit
1) Connect scan tool to DLC with ignition switch OFF.
2) Check pending DTC and DTC with scan tool.
Is DTC P0481 displayed?Go to “DTC P0481:
Cooling Fan 2 (A/C
Condenser Fan) Control
Circuit”.Go to Step 3.
3Check A/C refrigerant
1) Check amount of A/C refrigerant referring to “A/C
System Performance Inspection in Section 7B”.
Is it good condition?Go to Step 4. Recharge refrigerant.
4Check wire circuit
1) Disconnect A/C condenser cooling fan control relay from
individual circuit fuse box No.1 with ignition switch
turned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and “BLU/YEL” wire terminal of A/C
condenser cooling fan control relay connector.
Is voltage 10 – 14V?Go to Step 7. Go to Step 5.
5Check wire circuit
1) Disconnect A/C compressor control relay from individual
circuit fuse box No.1 with ignition switch turn OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and “BLU/YEL” wire terminal of A/C
compressor control relay connector.
Is voltage 10 – 14 V?Faulty A/C compressor
control relay.Go to Step 6.
6Check wire circuit
1) Remove “A/C” fuse “20 A” from individual circuit fuse box
No.1 with ignition switch turned OFF.
2) Measure resistance between “BLU/YEL” wire terminal of
main fuse connector and engine ground.
Is resistance infinity?Open wire in “BLU/YEL”
circuit. If OK, go to Step
7.“BLU/YEL” wire shorted
to ground circuit.
7Check wire circuit
1) Disconnect connector from A/C condenser cooling fan
with ignition switch tun OFF.
2) Measure resistance between engine ground and “RED”
wire terminal of A/C condenser fan connector.
Is resistance infinity?Go to Step 8. “RED” wire shorted to
ground circuit.
8Check A/C condenser cooling fan control relay
1) Check A/C condenser cooling fan control relay referring
to “A/C System Relay Inspection in Section 7B”.
Is result in good condition?Go to Step 9. Replace relay.

Downloaded from www.Manualslib.com manuals search engine 1A-206 Engine General Information and Diagnosis:
Troubleshooting
NOTE
• Before performed trouble shooting, be sure to read the “Precautions of ECM Circuit Inspection”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.
• When A/C evaporator outlet air temp. is below 2.5 °C (36.5 °F), A/C remains OFF (“E01-47” terminal
voltage becomes 10 – 14 V). This condition is not abnormal.

Step Action Yes No
1Reception data check from BCM
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check DTC for CAN-DTC.
Is there CAN-DTC?Go to “Troubleshooting
for CAN-DTC”.Go to Step 2.
2A/C switch signal circuit check
1) Start engine and select “Data List” mode on scan tool.
2) Check A/C switch signal under following conditions
respectively.
A/C switch signal
Engine running, A/C switch OFF: OFF
Engine running, A/C switch ON and blower speed
selector turned 1st position or more: ON
Is check result satisfactory?Go to Step 3. Check A/C switch
circuit.
3DTC check of ECT sensor circuit
1) Check ECM for DTC of ECT sensor circuit.
Is there DTC P0116, DTC P0117 or DTC P0118?Go to applicable DTC
diag. flow.Go to Step 4.
4A/C condenser cooling fan control system check
Is A/C condenser cooling fan started when A/C and blower
speed selector switch are turned ON with engine running?Go to Step 10. Go to Step 5.
5A/C condenser cooling fan control circuit check
1) Check DTC with scan tool.
Is DTC P0481 displayed?Go to “DTC P0481:
Cooling Fan 2 (A/C
Condenser Fan) Control
Circuit”.Go to Step 6.

Downloaded from www.Manualslib.com manuals search engine 1A-210 Engine General Information and Diagnosis:
Troubleshooting
NOTE
• Before performed trouble shooting, be sure to read the “Precautions of ECM Circuit Inspection”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.

Step Action Yes No
1DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch and check DTC.
Is there DTC U0073 and/or U0140?Go to applicable DTC
diag. flow.Go to Step 2.
2Electric load signal circuit check
1) Start engine and select “Data List” mode on scan tool.
2) Check electric load signal under following conditions
respectively.
Blower fan signal (Manual A/C model)
Blower speed selector turned OFF, 1st or 2nd
position: OFF
Blower speed selector turned to 3rd position or
more: ON
Blower fan signal (Automatic A/C model)
Blower speed selector OFF or 1st position: OFF
Blower speed selector turned to 3rd position or
more: ON
Radiator fan signal
Engine coolant temperature is lower than 100 °C
(212 °F): OFF
Engine coolant temperature is higher than 100 °C
(212 °F): ON
Electric load signal
Engine running, rear defogger switch, small light or
headlight switch OFF: OFF
Engine running, rear defogger switch, small light or
headlight switch ON: ON
Is check result satisfactory?Electric load signal
circuit is in good
condition.Check defective signal
circuit.

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-211
Radiator Cooling Fan Control System CheckS6RW0D1104080
Wiring Diagram
Troubleshooting
WARNING!
Keep hands, tools, and clothing away from radiator cooling fan to help prevent personal injury. This
fan is electric and can come on whether or not the engine is running. The fan can start automatically in
response to the ECT sensor with the ignition switch at the “ON” position.

NOTE
• Before performed trouble shooting, be sure to read the “Precautions of ECM Circuit Inspection”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.

E01C01
3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238 3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238
BLK/REDBLK/RED
BLK/YELBLK/YEL
BLK/YEL
BRN/WHT
12V
5V5V
26
E01-1
E01-60
C01-58
C01-15 C01-30
BLK/ORN
BLKBLK
BLK/RED
LT GRN
BLK/REDE01-16
E01-46
BLU/REDBLKGRY
LT GRN
ORN
C01-24
C01-55 3
4
5
E01-31 BLK
8 71
I6RW0D110058-01
1. Individual circuit fuse box No.1 3. Radiator cooling fan relay 5. ECT sensor 7. “FI” fuse
2. Main relay 4. Radiator cooling fan motor 6. ECM 8. “RDTR” fuse

Downloaded from www.Manualslib.com manuals search engine Precautions: 3-1
Driveline / Axle
Precautions
Precautions
Precautions on Driveline / AxleS6RW0D3000001
Precaution for Rear Differential Oil Leakage
Refer to “Precaution for Rear Differential Oil Leakage in Section 3B”.
Precaution in Diagnosing Trouble
Refer to “Precautions in Diagnosing Trouble in Section 3B”.
Precaution on CAN Troubleshooting
Refer to “Precaution on CAN Troubleshooting in Section 1A”.

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.