Suzuki SX4 Service Manual page 667

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Troubleshooting
Step
1
Scan tool communication check
Can scan tool communicate with BCM?
2
ESP® hydraulic unit / control module assembly power
and ground circuit check
1) Check that ESP® hydraulic unit / control module
assembly power supply circuit and ground circuit is in
good condition referring to "ESP® Hydraulic Unit /
Control Module Assembly Power and Ground Circuit
Check".
Are check results OK?
3
Data link connector power source circuit check
1) Disconnect scan tool from data link connector.
2) Check for proper connection to scan tool.
3) If OK then turn ignition switch to ON position, and
measure voltage between terminal B of data link
connector and vehicle body ground.
Is voltage 10 – 12 V?
4
Data link connector ground circuit check
1) Turn ignition switch to OFF position, and measure
resistance between the following terminals:
• Terminal G of data link connector and vehicle body
ground.
• Terminal G1 of data link connector and vehicle body
ground.
Are resistance less than 2
5
Serial communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by serial data circuit.
3) Check proper connection at serial data circuit terminals.
4) If OK, then check for high resistance, open or short to
power circuit or ground in serial data circuit.
Is check result in good condition?
6
CAN communication line circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check for proper connection to CAN communication line
wire.
3) If OK then check CAN communication line circuit
between control modules for open, short and high
resistance.
Is each CAN communication line circuit in good condition?
Action
?
Electronic Stability Program:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Substitute a known-
good ESP® hydraulic
unit / control module
assembly. If scan tool
can not communicate
still, substitute a known-
good BCM and recheck.
4F-29
No
Go to Step 3.
Repair ESP® hydraulic
unit / control module
assembly power or
ground circuit.
Terminal B circuit open
or shorted to ground.
Terminal G and/or G1
wire circuit open or high
resistance.
Repair serial data circuit
and recheck.
Repair CAN
communication line
circuit and recheck.

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