Suzuki 2006 SX4 Service Manual page 54

1A-4 Engine General Information and Diagnosis:
[A]: Non-Taiwan model
[B]: Taiwan model
No. Part Name
1. ABS control module
2. ECM
3. TCM
4. BCM
5. Keyless start control module
6. 4WD control module
7. Combination meter
8. CAN junction connector
9. DLC
Outline of troubleshooting
When there is a trouble with CAN, perform "Troubleshooting for Communication Error with Scan Tool Using CAN" and/
or "Troubleshooting for CAN-DTC". Not using this procedure or performing troubleshooting in any other way may skip
some check points resulting in misdiagnosis or take a longer time than necessary.
1) Checking connector related to CAN
2) Checking CAN line
3) Checking each control module/sensor using "DTC check" or "Bus Check"
4) Checking power and ground connection of each control module/sensor
CAN-DTC
Even when DTC related to CAN (= CAN-DTC) as described below is detected, it is not possible to point out the
specific trouble point by CAN-DTC itself. Be sure to troubleshoot according to "Troubleshooting for CAN-DTC".
CAN-DTC table
Detected Control Module
ECM
TCM
BCM
4WD control module
Keyless start control module
Communication with scan tool
• K line or CAN line is used for communication between each control module and scan tool.
Refer to "CAN schematic and routing diagram: " to determine which line is used for communication between each
control module and scan tool.
• ECM and TCM use CAN line for communication with scan tool. Even if CAN has a trouble other than between DLC
and BCM, communication may also fail between scan tool and these control modules. In such case, perform
troubleshooting according to "Troubleshooting for Communication Error with Scan Tool Using CAN".
• BCM, ABS control module and 4WD control module use K-line for communication with scan tool. Even if CAN has a
trouble, it is possible to communicate between scan tool and these control modules.
Bus check with SUZUKI scan tool
SUZUKI scan tool (SUZUKI-SDT) efficiently diagnoses a CAN bus malfunction by "Communication Bus Check" and
"Communication Malfunction DTC" under "Bus check".
"Communication Bus Check" can display all control modules/sensors name communicated by CAN.
Also, "Communication Malfunction DTC" can display only CAN-DTC which is detected by the control modules (ECM
and TCM) communicating with scan tool using CAN line.
[C]: CAN high line (RED)
[D]: CAN low line (WHT)
Communication with scan tool
K-line
CAN
CAN
K-line
Not available
K-line
Not available
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CAN-DTC
U0073/U0101/U0121/U0140/P1618
U0073/U0100
U0073/U0100/U0101/U0155/U1144
U0073/U0100/U0121/U0155
No.31/No.33
[E]: K-line
Monitor of CAN-DTC
Not available
Available
Available
Available
Available
Available
Not available
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