Suzuki SX4 Service Manual page 80

1A-30 Engine General Information and Diagnosis:
Step
5 CAN line check between DLC and BCM
1) Turn ignition switch to OFF position.
2) Disconnect BCM connector from BCM.
3) Check for proper connection to all terminals of BCM
connector.
4) If OK, check CAN lines between DLC and BCM
connector for open, short to power circuit, short to
ground circuit, short to other CAN line and high
resistance.
Are CAN lines between DLC and BCM connector in good
condition?
6 Control module connector check
1) Turn ignition switch to OFF position.
2) Disconnect all the following control module / sensor
connectors.
• Control modules communicated by CAN
– ECM
– TCM
– ABS / ESP® control module
– BCM
– Combination meter
– Keyless start control module
– 4WD control module
• Sensor communicated by CAN
– Steering angle sensor (ESP® model)
– Yaw rate / G sensor (ESP® model)
3) Check for proper connection to each CAN line terminal
of all control module / sensor (communicated by CAN)
connectors.
4) If OK, connect connectors of all control module/sensor
communicated by CAN securely.
5) Check communication between scan tool and ECM/TCM
by DTC check in ECM/TCM.
Is it possible to check DTC in ECM and TCM?
Action Yes
Go to Step 6.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
No
Repair CAN line.
Go to Step 7.