Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 531
10B-25 Body Electrical Control System:
DTC Troubleshooting
Step
Action
Yes
No
1
Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN and reconnect
securely.
2) Recheck DTC and reconnect securely.
Is DTC U1073 detected?
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
2
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 3.
Repair circuit.
3
DTC check of BCM
1) Turn ignition switch to OFF position.
2) Connect connectors of disconnected control modules
communicating by means of CAN.
3) Disconnect connector from any one of control modules
other than BCM.
4) Recheck DTC for BCM.
Is DTC U1073 detected?
Disconnect connectors
of control modules other
than the one whose
connector is
disconnected in Step 3)
one by one and check
that DTC U1073 is
detected by BCM each
time connector is
disconnected. When
DTC U1073 is not
detected by BCM while
checking in this way, go
to description under
“NO” below. If DTC
U1073 is detected by
BCM even when
connectors of all control
modules that use CAN
communication with
BCM are disconnected,
substitute a known-
good BCM and recheck.
Check power and
ground circuit of control
module disconnect in
Step 3). If circuit is OK,
substitute a known-
good control module
disconnected in Step 3)
and recheck.
Body Electrical Control System: 10B-26
DTC U1100 (No. 1100): Lost Communication with ECM (Petrol Engine Model)
S6JB0AA204014
Wiring Diagram
Refer to “DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
DTC Troubleshooting
DTC detecting condition
Trouble area
BCM can not receive CAN data from ECM for
longer than specified time continuously.
• CAN communication circuit
• BCM
• ECM
Step
Action
Yes
No
1
DTC check of BCM
Is DTC U1100 (No. 1100) and DTC U1073 (No. 1073)
detected together?
Go to “DTC U1073 (No.
1073): Control Module
Communication Bus
Off”.
Go to Step 2.
2
DTC check of ECM
1) Check ECM for DTC.
Is DTC P1674 detected?
Go to “DTC P1674:
CAN Communication
(Bus Off Error): For
Petrol Engine Model in
Section 1A”.
Go to Step 3.
3
DTC check of ABS or ESP
® control module
1) Check DTC for ABS or ESP
® control module.
Is DTC U1073 detected?
Go to “DTC U1073:
Control Module
Communication Bus Off
(Petrol Engine Model) in
Section 4E”.
Go to Step 4.
4
Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck BCM for DTC.
Is DTC U1100 (No. 1100) detected?
Go to Step 5.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
5
DTC check of ABS or ESP
® control module
1) Check DTC for ABS or ESP
® control module.
Is DTC U1100 detected?
Go to Step 6.
Go to Step 7.
6
CAN communication circuit check
1) Disconnect connectors from ECM and ABS or ESP
®
control module.
2) Check CAN communication circuit between ECM and
ABS or ESP
® control module for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.
Repair circuit.
10B-27 Body Electrical Control System:
DTC U1100 (No. 1100): Lost Communication with ECM (Diesel Engine Model)
S6JB0AA204019
Wiring Diagram
Refer to “DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
7
CAN communication circuit check
1) Disconnect connectors from BCM and ABS or ESP
®
control module.
2) Check CAN communication circuit between BCM and
ABS or ESP
® control module for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Go to Step 8.
Repair circuit.
8
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 7 for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Go to Step 9.
Repair circuit.
9
DTC check of BCM
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect connector of any one of control module other
than BCM.
3) Recheck BCM for DTC.
Is DTC U1100 (No.1100) detected?
Disconnect connectors
of control modules other
than the one whose
connector is
disconnected in Step 2)
one by one and check
that DTC U1100 is
detected by BCM each
time connector is
disconnected. When
DTC U1100 is not
detected by BCM while
checking in this way, go
to description under
“NO” below. If DTC
U1100 is detected by
BCM even when
connectors of all control
modules that use CAN
communication with
BCM are disconnected,
substitute a known-
good BCM and recheck.
Check power and
ground circuit of control
module disconnected in
Step 2). If circuit is OK,
substitute a known-
good control module
disconnected in Step 2)
and recheck.
Step
Action
Yes
No
DTC detecting condition
Trouble area
BCM can not receive CAN data from ECM for
longer than specified time continuously.
• CAN communication circuit
• BCM
• ECM
Body Electrical Control System: 10B-28
DTC Troubleshooting
Step
Action
Yes
No
1
DTC check of BCM
Is DTC U1100 (No. 1100) and DTC U1073 (No. 1073)
detected together?
Go to “DTC U1073 (No.
1073): Control Module
Communication Bus
Off”.
Go to Step 2.
2
DTC check of ABS or ESP
® control module
Is DTC U1073 detected?
Go to “DTC U1073:
Control Module
Communication Bus Off
(Diesel Engine Model)
in Section 4E”.
Go to Step 3.
3
Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck BCM for DTC.
Is DTC U1100 (No. 1100) detected?
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
4
DTC check of ABS or ESP
® control module
1) Check DTC for ABS or ESP
® control module.
Is DTC U1100 detected?
Go to Step 5.
Go to Step 6.
5
CAN communication circuit check
1) Disconnect connectors from ECM and ABS or ESP
®
control module.
2) Check CAN communication circuit between ECM and
ABS or ESP
® control module for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.
Repair circuit.
6
CAN communication circuit check
1) Disconnect connectors from BCM and ABS or ESP
®
control module.
2) Check CAN communication circuit between BCM and
ABS or ESP
® control module for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Go to Step 7.
Repair circuit.
7
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 6 for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Go to Step 8.
Repair circuit.
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