Suzuki SX4 Service Manual page 219

Step
3 CAN line check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control module / sensor
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 / ESP® control
module connector
• Between ABS / ESP® 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
• Between BCM connector and yaw rate / G sensor
connector
• Between combination meter connector and steering
angle sensor connector
Are all CAN lines in good condition?
4 Power and ground circuits check of BCM, ECM, ABS /
ESP® 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 / ESP® control module:
Refer to "ABS Hydraulic Unit / Control Module
Assembly Power and Ground Circuit Check in Section
4E" or "ESP® Hydraulic Unit / Control Module
Assembly Power and Ground Circuit Check in Section
4F".
Are they in good condition?
Action
Engine General Information and Diagnosis:
Yes
Go to Step 4.
Go to Step 5.
1A-169
No
Repair CAN line.
Repair power and/or
ground circuit.