Suzuki SX4 Service Manual page 81

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Step
7
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 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 BCM connector and yaw rate / G sensor
connector
• Between combination meter connector and steering
angle sensor connector
• Between combination meter connector and 4WD
control module connector
• Between BCM connector and combination meter
connector
Are all CAN lines in good condition?
8
Communication check between scan tool and ECM
1) Turn ignition switch to OFF position.
2) Connect ECM, BCM, ABS / ESP® control module and
combination meter connectors.
3) Check communication between scan tool and ECM by
DTC check in ECM.
Is it possible to check DTC in ECM?
9
Communication check between scan tool and TCM
1) Turn ignition switch to OFF position.
2) Connect TCM connectors.
3) Check communication between scan tool and TCM by
DTC check in TCM.
Is it possible to check DTC in TCM?
10 Internal circuit check in ECM
1) Turn ignition switch to OFF position and then disconnect
negative (–) cable at battery.
2) Disconnect TCM connectors.
3) Measure resistance between the followings
• Between CAN High terminal on DLC and "C06-17"
terminal on TCM connector
• Between CAN Low terminal on DLC and "C06-7"
terminal on TCM connector
Is each resistance 0 – 1
Action
?
Engine General Information and Diagnosis:
Yes
Go to Step 8.
A/T model: Go to Step
9.
M/T model: Substitute a
known-good ECM and
recheck.
Identify malfunction
control module by
performing Step 13
through Step 16 of
"Troubleshooting for
CAN-DTC".
Substitute a known-
good TCM and recheck.
1A-31
No
Repair CAN line.
Go to Step 4 through
Step 11 of
"Troubleshooting for
CAN-DTC".
Go to Step 10.
Substitute a known-
good ECM and recheck.

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