CAN communication SUZUKI SWIFT 2006 2.G Service Repair Manual

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Circuit Description
EBD warning lamp (brake warning lamp) is controlled by ESP® control module and BCM through lamp driver module
in combination meter.
If EBD system is in good condition, ESP ® control module turns EBD warning lamp ON at the ignition switch ON,
keeps it ON for 2 seconds and then turns it OFF.
EBD warning lamp is turned ON cont inuously at the following conditions.
• EBD system is an abnormality
• Connector of ESP ® control module is disconnected
• Parking brake switch is ON
• Brake fluid level is lower than minimum level
The information of parking brake switch and brake fluid leve l are transmitted from BCM to lamp driver module in
combination meter through CAN communication line.
Troubleshooting
Step Action Yes No 1 Check parking brake and brake fluid level
1) Make sure that:
• Parking brake is completely released.
• Brake fluid level is upper than the minimum level.
Are the check results OK? Go to Step 2. Release parking brake
completely and/or
replenish brake fluid.
2 Check ABS warning lamp
1) Turn ignition switch to ON position.
Does ABS warning lamp come on steady? Perform “ABS Warning
Lamp Does Not Come
ON at Ignition Switch
ON” previously outlined.Go to Step 3.
3 Check parking brake switch circuit and brake fluid level
switch circuit
1) Release parking brake completely, and replenish brake
fluid.
2) Disconnect BCM connectors with ignition switch turned OFF.
3) Measure resistance between each terminal of “L01-6”, “E46-5” and vehicle body ground.
Are resistance
∞ Ω? Go to Step 4. Check each applicable
circuit for short to
vehicle body ground. If
OK, then check parking
brake switch and/or
brake fluid level switch.
4 CAN communication circuit check
1) CAN communication circuit between combination meter,
ABS (ESP® ) control module and BCM referring to “DTC
U1073: Control Module Communication Bus Off”.
Is CAN communication circuit in good condition? Substitute a known-
good combination meter
and recheck. If EBD
warning lamp remains
ON, substitute a known-
good ESP
® hydraulic
unit / control module
assembly and recheck. Repair or replace.

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DTC Troubleshooting
DTC C1038: Steering Angle Sensor Detect Rolling Counter Failure from ESP® Control ModuleS7RS0B4604034
DTC Detecting Condition and Trouble AreaStep Action Yes No
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2 Go to “Electronic
Stability Program
System Check”.
2 Check fuse
1) Check circuit fuses for steering angle sensor and its
circuit.
Is it good condition? Go to Step 3. Replace fuse and check
for short circuit to
ground.
3 Check steering angle sensor power supply circuit
1) Turn ignition switch to OFF position.
2) Disconnect steering angle sensor connector.
3) Check for proper connection to steering angle sensor
connector terminals at “G50-1”, “G50-2” and “G50-3”.
4) If OK, then measure voltage between connector terminal “G50-3” and vehicle body ground.
Is it 10 – 14 V? Go to Step 4. “WHT/RED” wire circuit
open.
4 Check steering angle sensor power supply circuit
1) Measure voltage between connector terminal “G50-1”
and vehicle body ground with ignition switch turned ON.
Is it 10 – 14 V? Go to Step 5. “GRN/ORN” wire circuit
open.
5 Check steering angle sensor ground circuit
1) Turn ignition switch to OFF position.
2) Measure resistance between connector terminal “G50-2”
and vehicle body ground.
Is resistance less than 2
Ω? Go to Step 6. “BLK/ORN” wire circuit
open or high resistance.
6 Check steering angle sensor
1) Connect steering angle sensor connector.
2) Check steering angle sensor referring to “Steering Angle
Sensor On-Vehicle Inspection”.
Is it good condition? Substitute a known-
good ESP
® hydraulic
unit / control module
assembly and recheck. Substitute a known-
good steering angle
sensor and recheck.
DTC Detecting Condition
Trouble Area
ESP ® control module rolling counte r failure is detected by
steering angle sensor. • CAN communication circuit
• Steering angle sensor
• ESP
® control module

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DTC C1073: Lost Communication With Yaw Rate / G Sensor AssemblyS7RS0B4604038
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
[A]E85
161
15
2
3
4
5
6
7
8
9
10
11
12
13
14
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3233
34
35
36
37
38
39
40
41
42
43
44
45
46
47
E85-29E85-25
E85-37
E85-31
E84-3
E84-5
E84-2E84-1 12V
GRN/BLK
BLU/RED
WHT/BLK
RED/BLK [B]
E843
521
46
1
2 3
2
I7RS0B460010-01
[A]: ESP ® control module connector (viewed from
terminal side) 1. Yaw rate / G sensor assembly 3. ESP
® hydraulic unit control module assembly
[B]: Yaw rate / G sensor assembly connector (viewed from harness side) 2. CAN driver (for yaw rate / G
sensor assembly)
DTC Detecting Condition Trouble Area
CAN line communication error in ESP ® control module
and yaw rate / G sensor assembly is detected. • CAN communication circuit (for yaw rate / G sensor
assembly)
• Yaw rate / G sensor assembly
• ESP ® control module
Step Action YesNo
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2.Go to “Electronic
Stability Program
System Check”.
2 Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN (for yaw rate / G
sensor assembly).
2) Check DTC for ESP ®.
Is DTC C1073 detected? Go to Step 4.
Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection
in Section 00”.
3 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP ® control module and yaw
rate / G sensor assembly.
Is each CAN communicati on circuit between ESP
® control
module and yaw rate / G sensor assembly opened, shorted
or high resistance? Repair or replace the
CAN communication
line.
Go to Step 5.

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DTC Troubleshooting
DTC C1090: Invalid Communication with ECMS7RS0B4604040
DTC Detecting Condition and Trouble Area
DTC TroubleshootingStep Action Yes No
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2. Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch ON and check DTC for ESP ®.
Is there any DTC(s) other than C1075, C1076 and C1078? Go to applicable DTC
diag. flow.
Go to Step 3.
3 Check sensor calibration
1) Calibrate all sens ors referring to “Sensor Calibration”.
2) Clear all DTC(s) and check DTC for ESP ®.
Is DTC C1075, C1076 and/ or C1078 still detected? DTC C1075: Substitute
a known-good steering
angle sensor and
recheck.
DTC C1076: Substitute
a known-good ESP
®
hydraulic unit / control
module assembly and
recheck.
DTC C1078: Substitute
a known-good yaw rate
/ G sensor assembly
and recheck. Calibration was
incompleted.
DTC Detecting Condition
Trouble Area
ESP ® control module rolling counte r failure is detected by
ECM. • CAN communication circuit
•ECM
• ESP
® control module
Step Action YesNo
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2.Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch ON and check DTC for ESP ®.
Is there any DTC(s) other than C1038 and C1090? Go to applicable DTC
diag. flow.
Go to Step 3.
3 DTC check for ECM
1) Check DTC for ECM.
Is DTC P1674 and/or DTC P1685 detected? Go to applicable DTC
diag. flow.
Substitute a known-
good ESP
® hydraulic
unit / control module
assembly and recheck.

Downloaded from www.Manualslib.com manuals search engine 4F-48 Electronic Stability Program:
DTC C1091 / C1094: ECM Data in CAN Line Failure / Invalid Torque Control Communication with
ECM
S7RS0B4604041
DTC Detecting Condition and Trouble Area
DTC TroubleshootingDTC Detecting Condition Trouble Area
C1091:
ECM sent invalid signal to ESP ® control module.
C1094:
Reception error of torque control signal with ECM • Engine control system
•ECM
• ESP
® control module
Step Action YesNo
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2.Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch ON and check DTC for ESP ®.
Is DTC C1090 detected? Go to applicable DTC
diag. flow.
Go to step 3.
3 DTC check other control module than ESP ®
1) Check DTC for ECM.
Is there any DTC(s)? Go to applicable DTC
diag. flow.
Substitute a known-
good ESP
® hydraulic
unit / control module
assembly and recheck.

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DTC U1073: Control Module Communication Bus OffS7RS0B4604057
Wiring Diagram
DTC Detecting Condition and Trouble Area
E85-13E85-44
E46-2E46-1
G37-4G37-2
E85-46E85-42
E23-3E23-18
G50-9G50-10
G28-8G28-10
G28-9G28-7
G42-19G42-18
REDWHT
WHTRED
WHTRED
REDWHT
REDWHT
WHTRED
REDWHT
REDWHT
REDWHT
[A]
21
E2334
1819
5671011
17
20
47 46
495051
2122
52 16
25 9
24
14
29
5557 54 53
59
60 5826
27
28
15
30
56 4832 31343536374042 39 38
44
45 43 41 33
1213
238
G42[F]
1234567891011
141516
36 34 33 32 31 30 29 24 23
37
181920
[B]
E85
161
15
2
3
4
5
6
7
8
9
10
11
12
13
14
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3233
34
35
36
37
38
39
40
41
42
43
44
45
46
47 [C]
G37
E46
124
53
67
891011121314124
53
67
891011
1213141516171819202122
[E] G28
12345678910111213141516
17181920212223242526272829303132
[D] G50
109 321
4
5
7 1
2
3
6
I7RS0B460011-02
[A]: ECM connector (viewed from harness side) [F]: Keyless start control module
connector (viewed from
harness side) 5. Combination meter
[B]: ESP ® control module connector (viewed from
terminal side) 1. ECM
6. Keyless start control module (if equipped)
[C]: BCM connector (viewed from harness side) 2. ESP® hydraulic unit / control
module assembly 7. Junction connector
[D]: Steering angle sensor connector (viewed from harness side) 3. BCM
[E]: Combination meter connector (viewed from harness side) 4. Steering angle sensor
DTC Detecting Condition
Trouble Area
Transmission error that is inconsistent between
transmission data and transmission monitor (CAN bus
monitor) data is detected more than 7 times continuously. • CAN communication circuit
•ECM
• ESP
® control module
•BCM
• Steering angle sensor
• Combination meter
• Keyless start control module (if equipped)

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DTC Troubleshooting
DTC U1100: Lost Communication with ECM (Reception Error)S7RS0B4604058
Wiring Diagram
Refer to “Wiring Diagram” under “DTC U1073: Control Module Communication Bus Off”.
DTC Detecting Condition and Trouble Area
DTC TroubleshootingStep Action Yes No
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2. Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC for ESP ®.
Is DTC U1073 indicated? Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
3 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control modules for open, short and high resistance.
Is each CAN communication circuit in good condition? Go to Step 4. Repair or replace the
CAN communication
line.
4 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector. •ECM
• Keyless start control module (if equipped)
• Combination meter
• Steering angle sensor
•BCM
3) Recheck DTC for ESP ®.
Is DTC U1073 detected? Check ESP
® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP ®
hydraulic unit / control
module assembly and
recheck. Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.
DTC Detecting Condition
Trouble Area
ECM message data is missing from CAN communication. • CAN communication circuit
•ECM
• ESP® control module
Step Action YesNo
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2.Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Check DTC for ESP ®.
Is DTC U1100 and DTC U1073 detected together? Go to “DTC U1073:
Control Module
Communication Bus
Off”.Go to Step 3.
3 DTC check for ECM
1) Check DTC for ECM.
Is DTC P1674 detected? Go to “DTC P1674:
CAN Communication
(Bus Off Error) in
Section 1A”.Go to Step 4.

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DTC U1126: Lost Communication with Steering Angle Sensor (Reception Error)S7RS0B4604043
Wiring Diagram
Refer to “Wiring Diagram” under “DTC U1073: Control Module Communication Bus Off”.
DTC Detecting Condition and Trouble Area
DTC Troubleshooting4
Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Check DTC for ESP ®.
Is DTC U1100 detected? Go to Step 5. Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection
in Section 00”.
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP ® control module and
ECM communicating by means of CAN.
3) Check CAN communication circuit between ESP®
control module and ECM for open, short and high
resistance.
Is each CAN communication circuit in good condition? Repair or replace the
CAN communication
line.
Go to Step 6.
6 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control modules other than Step 5 for open, short and high
resistance.
Is each CAN communication circuit in good condition? Go to Step 7. Repair or replace the
CAN communication
line.
7 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector. •ECM
• Keyless start control module (if equipped)
• Combination meter
• Steering angle sensor
•BCM
3) Recheck DTC for ESP ®.
Is DTC U1100 detected? Check ESP
® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP ®
hydraulic unit / control
module assembly and
recheck. Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.
Step Action Yes No
DTC Detecting Condition
Trouble Area
Steering angle sensor message data is missing from CAN
communication. • CAN communication circuit
• Steering angle sensor
• ESP
® control module
Step Action YesNo
1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2.Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Check DTC for ESP ®.
Is DTC U1126 and DTC U1073 detected together? Go to “DTC U1073:
Control Module
Communication Bus
Off”.Go to Step 3.

Downloaded from www.Manualslib.com manuals search engine 4F-52 Electronic Stability Program:
DTC U1140: Lost Communication with BCM (Reception Error)S7RS0B4604045
Wiring Diagram
Refer to “Wiring Diagram” under “DTC U1073: Control Module Communication Bus Off”.
DTC Detecting Condition and Trouble Area3
Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Check DTC for ESP ®.
Is DTC U1126 detected? Go to Step 4. Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection
in Section 00”.
4 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP ® control module, BCM
and steering angle sensor communicating by means of
CAN.
3) Check CAN communication circuit for open, short and high resistance.
• Between ESP ® control module and BCM
• Between steering angle sensor and BCM
Is each CAN communication circuit in good condition? Repair or replace the
CAN communication
line.
Go to Step 5.
5 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control modules other than Step 4 for open, short and high
resistance.
Is each CAN communication circuit in good condition? Go to Step 6. Repair or replace the
CAN communication
line.
6 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector. •ECM
• Keyless start control module
• Combination meter
• Steering angle sensor
•BCM
3) Check DTC for ESP ®.
Is DTC U1126 detected? Check ESP
® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP ®
hydraulic unit / control
module assembly and
recheck. Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.
Step Action Yes No
DTC Detecting Condition
Trouble Area
BCM message data is missing from CAN communication. • CAN communication circuit
•BCM
• ESP® control module

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DTC TroubleshootingStep Action Yes No 1 Was “Electronic Stability Pr ogram Check” performed? Go to Step 2. Go to “Electronic
Stability Program
System Check”.
2 DTC check for ESP®
1) Check DTC for ESP ®.
Is DTC U1140 and DTC U1073 detected together? Go to “DTC U1073:
Control Module
Communication Bus
Off”.Go to Step 3.
3 DTC check for BCM
1) Check DTC for BCM.
Is DTC U1073 detected? Go to “DTC U1073 (No.
1073): Control Module
Communication Bus Off
in Section 10B”.Go to Step 4.
4 Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Check DTC for ESP ®.
Is DTC U1140 detected? Go to Step 4. Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection
in Section 00”.
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP ® control module and
BCM communicating by means of CAN.
3) Check CAN communication circuit between ESP®
control module and BCM for open, short and high
resistance.
Is each CAN communication circuit in good condition? Repair or replace the
CAN communication
line.
Go to Step 6.
6 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control modules other than Step 5 for open, short and high
resistance.
Is each CAN communication circuit in good condition? Go to Step 7. Repair or replace the
CAN communication
line.
7 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector. •ECM
• Keyless start control module
• Combination meter
• Steering angle sensor
•BCM
3) Check DTC for ESP ®.
Is DTC U1140 detected? Check ESP
® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP ®
hydraulic unit / control
module assembly and
recheck. Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.