SUZUKI SX4 2006 1.G Service Workshop Manual

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DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

DTC detecting condition Trouble area
Difference between the opening angle based on throttle position
sensor (main) and the opening angle based on throttle position
sensor (sub) is more than specification for specified time.
(1 driving detection logic)• Throttle position sensor (main) and (sub) circuit
• Electric throttle body assembly
•ECM
Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Throttle position sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch, check each voltage of “TP
Sensor 1 Volt” and “TP Sensor 2 Volt” displayed on scan
tool when accelerator pedal is idle position and fully
depressed.
Is each TP sensor voltage within specified value in the table
“Scan Tool Data”?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.Go to Step 3.
3ECM voltage check
1) Disconnect connector from electric throttle body
assembly with ignition switch turned OFF.
2) Check for proper connection to electric throttle body
assembly at “RED”, “GRN”, “WHT” and “BLK” wire
terminals.
3) If OK, measure voltage between “RED” wire terminal of
electric throttle body assembly connector and engine
ground with ignition switch turned ON.
Is voltage 4 – 6 V?Go to Step 6. Go to Step 4.
“WHT”
“YEL”“RED”
“GRN” “BLU”“BLK”
I5RW0C110016-01

Downloaded from www.Manualslib.com manuals search engine 1A-162 Engine General Information and Diagnosis:
4Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “C01-43” terminal of ECM
connector and engine ground.
Is resistance infinity?Go to Step 5. “RED” wire is shorted to
other circuit.
5Wire harness check
1) Measure voltage between “C01-43” terminal of ECM
connector and engine ground with ignition switch turned
ON.
Is voltage 0 V?Substitute a known-
good ECM and recheck.“RED” wire is shorted to
other circuit.
6Wire harness check
1) Measure voltage between “GRN” wire terminal of electric
throttle body assembly connector and engine ground,
between “WHT” wire terminal of electric throttle body
assembly connector and engine ground with ignition
switch turned ON.
Is each voltage 4 – 6 V?Go to Step 9. Go to Step 7.
7Wire harness check
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM.
3) Check for proper connection of ECM connector at “C01-
54” and “C01-40” terminals.
4) If OK, measure voltage between “C01-54” terminal of
ECM connector and engine ground, between “C01-40”
terminal of ECM connector and engine ground.
Is each voltage 0 V?Go to Step 8. “GRN” wire or “WHT”
wire is shorted to other
circuit.
8Wire harness check
1) Measure resistance between “GRN” wire terminal of
electric throttle body assembly connector and engine
ground, between “WHT” wire terminal of electric throttle
body assembly connector and engine ground with
ignition switch turned OFF.
Is each resistance infinity?Substitute a known-
good ECM and recheck.“GRN” wire or “WHT”
wire is shorted to other
circuit.
9Electric throttle body assembly check
1) Check throttle position sensor referring to “Throttle
Position Sensor Performance Check” under “Electric
Throttle Body Assembly On-Vehicle Inspection in
Section 1C”.
Is each output voltage within specified value?Substitute a known-
good ECM and recheck.Replace electric throttle
body assembly. Step Action Yes No

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DTC P2138: Pedal Position Sensor (Main / Sub) Voltage CorrelationS6RW0D1104067
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.
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
BRN
GRN
BLU
RED
YEL
WHT
E01-35
E01-37
E01-52
E01-34
E01-36
E01-51
E01-505 V
5 V 1
1-132
1-2
BLK
I6RW0D110050-01
1. APP sensor assembly 1-2. APP sensor (sub) 3. Ground of APP sensor for shield wire
1-1. APP sensor (main) 2. ECM
DTC detecting condition Trouble area
Difference between the opening angle based on APP sensor (main) and
the opening angle based on APP sensor (sub) is more than specification
for specified time.
(1 driving detection logic)• APP sensor (main) and (sub) circuit
• APP sensor assembly
•ECM

Downloaded from www.Manualslib.com manuals search engine 1A-164 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2APP sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check each voltage of “APP Sensor 1 Volt” and “APP
Sensor 2 Volt” displayed on scan tool when accelerator
pedal is idle position and fully depressed.
Is each APP sensor voltage within specified value in the
table “Scan Tool Data”?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.Go to Step 3.
3ECM voltage check
1) Disconnect connector from APP sensor assembly with
ignition switch turned OFF.
2) Check for proper connection to APP sensor assembly at
“BRN”, “GRN”, “BLU”, “RED”, “YEL” and “WHT” wire
terminals.
3) If OK, measure voltage between “BRN” wire terminal of
APP sensor assembly connector and vehicle body
ground, between “RED” wire terminal of APP sensor
assembly connector and vehicle body ground with
ignition switch turned ON.
Is each voltage 4 – 6 V?Go to Step 6. Go to Step 4.
4Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “E01-
35” and “E01-34” terminals
3) If OK, measure resistance between “E01-35” terminal of
ECM connector and engine ground, between “E01-34”
terminal of ECM connector and engine ground.
Is each resistance infinity?Go to Step 5. “BRN” wire or “RED”
wire is shorted to other
circuit.
5Wire harness check
1) Measure voltage between “E01-35” terminal of ECM
connector and engine ground, between “E01-34”
terminal of ECM connector and engine ground with
ignition switch turned ON.
Is each voltage 0 V?Substitute a known-
good ECM and recheck.“BRN” wire or “RED”
wire is shorted to other
circuit.
"GRN" "BLU" "BRN"
"YEL"
"WHT"
"RED"
I4RS0B110048-01

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DTC P2227 / P2228 / P2229: Barometric Pressure Circuit MalfunctionS6RW0D1104068
DTC P2227: Barometric Pressure Circuit Range / Performance
DTC P2228: Barometric Pressure Circuit Low
DTC P2229: Barometric Pressure Circuit High
System Description
Barometric pressure sensor is installed in ECM.
DTC Detecting Condition and Trouble Area6Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “E01-
37”, “E01-52”, “E01-36” and “E01-51” terminals.
3) If OK, measure resistance between “GRN” wire terminal
of APP sensor assembly connector and vehicle body
ground, between “YEL” wire terminal of APP sensor
assembly connector and vehicle body ground.
Is each resistance infinity?Go to Step 7. “GRN” wire or “YEL”
wire is shorted to other
circuit.
7Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between “E01-37” terminal of ECM
connector and engine ground, between “E01-36”
terminal of ECM connector and engine ground.
Is each voltage 0 V?Go to Step 8. “GRN” wire or “YEL”
wire is shorted to other
circuit.
8APP sensor assembly check
1) 1)Check APP sensor referring to “Accelerator Pedal
Position (APP) Sensor Assembly Inspection in Section
1C”.
Is output voltage within specified value?Substitute a known-
good ECM and recheck.Replace APP sensor
assembly. Step Action Yes No
DTC detecting condition Trouble area
DTC P2227:
Difference of barometric pressure value and intake manifold pressure value
is more than specified value while engine cranking.
(2 driving cycle detection logic)• Manifold absolute pressure sensor
performance problem
• Barometric pressure sensor in ECM
DTC P2228:
Barometric pressure signal is lower than specified value.
(1 driving cycle detection logic)• Barometric pressure sensor in ECM
DTC P2229:
Barometric pressure signal is higher than specified value.
(1 driving cycle detection logic)

Downloaded from www.Manualslib.com manuals search engine 1A-166 Engine General Information and Diagnosis:
DTC Confirmation Procedure
DTC P2227:
WARNING!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester, on a level road.

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool and warm up
engine to normal operating temperature.
3) Check DTC and pending DTC by using scan tool.
DTC P2228 / P2229:
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch, clear DTC by using scan tool and run engine for 1 min.
3) Check DTC and pending DTC by using scan tool.
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

DTC U0073: Control Module Communication Bus OffS6RW0D1104069
Refer to “Troubleshooting for CAN-DTC”.
DTC U0101: Lost Communication with TCMS6RW0D1104082
Refer to “Troubleshooting for CAN-DTC”.
DTC U0121: Lost Communication with ABS Control ModuleS6RW0D1104070
Refer to“Troubleshooting for CAN-DTC”.
DTC U0140: Lost Communication with Body Control ModuleS6RW0D1104071
Refer to“Troubleshooting for CAN-DTC”.Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Is DTC P2227 set?Go to Step 3. Substitute a known-
good ECM and recheck.
3MAP sensor check
1) Check MAP sensor and its circuit referring to “DTC
P0107: Manifold Absolute Pressure Circuit Low
Input”and/or “DTC P0108: Manifold Absolute Pressure
Circuit High Input”.
Is check result satisfactory?Substitute a known-
good ECM and recheck.MAP sensor or its circuit
malfunction.

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Troubleshooting for CAN-DTCS6RW0D1104084
Perform this troubleshooting when CAN-DTC is detected.
NOTE
• When performing this troubleshooting, be sure to have full understanding of “Precaution on CAN
Troubleshooting” and observe it.
• It may be possible that CAN system has trouble because of fuse blown or low battery voltage.
Before troubleshooting, check to make sure that fuse, battery voltage and generator status are
normal.
• When performing “Communication Bus Check” using SUZUKI scan tool (SUZUKI-SDT) in each step
of this troubleshooting, use the following table to determine whether the control module is in good
condition or not.
Also, while performing “Communication Bus Check”, do not perform any work other than instructed
in this troubleshooting. Or, it may occur that display of control module/sensor on SUZUKI-SDT
screen and/or its background color may change.
• When disconnecting each control module connector in this troubleshooting, various DTCs will be
detected. Be sure to clear DTCs in the following control modules after completing this
troubleshooting.
–ECM
– BCM
–TCM
– Keyless start control module
– 4WD control module
– HVAC control module (Auto A/C model)
– P/S control module

Wiring Diagram
Refer to “Troubleshooting for Communication Error with Scan Tool Using CAN”.
Trouble area
Refer to “Troubleshooting for Communication Error with Scan Tool Using CAN”. Judgment Display of Communication Bus Check
Normal• All connected control modules/sensors (communicated by CAN) are displayed and its back ground
color is “White”.
Abnormal• Even one of connected control modules/sensors (communicated by CAN) is not displayed.
• Display of even one of connected control modules/sensors (communicated by CAN) changes.
• Background color of even one of connected control modules/sensors (communicated by CAN) is
displayed in “Gray” or “Light green”.
• Background color of even one of connected control modules/sensors (communicated by CAN)
changes

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”.

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3CAN line check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control module
communicated by CAN.
3) Check all the following CAN lines for open, short to
power circuit, short to ground circuit, short to other CAN
line and high resistance.
• Between BCM connector and DLC
• Between BCM connector and ABS control module
connector
• Between ABS control module connector and ECM
connector
• Between ECM connector and TCM connector
• Between BCM connector and keyless start control
module connector
• Between combination meter connector and 4WD
control module connector
• Between BCM connector and combination meter
connector
Are all CAN lines in good condition?Go to Step 4. Repair CAN line.
4Power and ground circuits check of BCM, ECM, ABS
control module and combination meter
1) Check power and ground circuits of the following control
module.
•ECM:
Refer to “ECM Power and Ground Circuit Check”.
•BCM:
Refer to “BCM Power Circuit and Ground Circuit
Check in Section 10B”.
• Combination meter:
Refer to “Combination Meter Circuit Diagram in
Section 9C”.
• ABS control module:
Refer to “ABS Hydraulic Unit / Control Module
Assembly Power and Ground Circuit Check in Section
4E”.
Are they in good condition?Go to Step 5. Repair power and/or
ground circuit.
5CAN communication check of BCM, ECM, ABS control
module and combination meter
1) Turn ignition switch to OFF position.
2) Connect BCM, ECM, ABS control module and
combination meter connectors.
3) Perform “Communication Bus Check” under “Bus
Check” using SUZUKI-SDT with ignition switch turned
ON.
Are all of BCM, ECM, ABS control module and combination
meter normally displayed?Go to Step 12. Go to Step 6. Step Action Yes No

Downloaded from www.Manualslib.com manuals search engine 1A-170 Engine General Information and Diagnosis:
6Terminating resistance check in ECM and combination
meter
1) Turn ignition switch to OFF position and then disconnect
negative (–) cable at battery.
2) Measure resistance between CAN High terminal (2) and
CAN Low terminal (3) on DLC (1).
If resistance 57 – 67
Ω?Go to Step 7. Go to Step 8.
7Substitute ECM and recheck
1) Substitute a known-good ECM and recheck.
Is it in good condition?End. Substitute a known-
good combination meter
and recheck. If NG, go
to Step 11.
8Terminating resistance check in ECM
1) Make sure that ignition switch is OFF position and
battery negative (–) cable is disconnected.
2) Disconnect combination meter connector.
3) Measure resistance between CAN high terminal and
CAN low terminal on DLC as the same manner as Step
6.
Is resistance 114 – 134
Ω?Substitute a known-
good combination
meter.Go to Step 9.
9Internal circuit check in BCM
1) Make sure that ignition switch is OFF position and
battery negative (–) cable is disconnected.
2) Disconnect ABS control module connector.
3) Measure resistance between the followings
• Between CAN high terminal on DLC and “E08-2”
terminal on ABS control module connector
• Between CAN low terminal on DLC and “E08-13”
terminal on ABS control module connector
Is each resistance 0 – 1
Ω?Go to Step 10. Substitute a known-
good BCM.
10Internal circuit check in ABS control module
1) Make sure that ignition switch is OFF position and
battery negative (–) cable is disconnected.
2) Connect ABS control module connector and disconnect
ECM connector.
3) Measure resistance between the followings
• Between CAN High terminal on DLC and “E01-3”
terminal on ECM connector
• Between CAN Low terminal on DLC and “E01-18”
terminal on ECM connector
If each resistance 0 – 1
Ω?Substitute a known-
good ECM and recheck.
If NG, go to step 11.Substitute a known-
good ABS control
module.
11Substitute BCM and recheck
1) Substitute a known-good BCM and recheck.
Is it in good condition?End. Substitute a known-
good ABS control
module. Step Action Yes No
2
1
9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8
3
I7RW01110098-01