Suzuki 2006 SX4, Service Manual

Page: 77 / 1478

Engine General Information and Diagnosis: 1A-33
7 CAN line check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control module
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 control module
connector
• Between ABS 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
Are all CAN lines in good condition?
Go to Step 8. Repair CAN line.
8 Communication check between scan tool and ECM
1) Turn ignition switch to OFF position.
2) Connect ECM, BCM, ABS 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?
A/T model: Go to Step
9.
M/T model: Substitute a
known-good ECM and
recheck. Go to Step 4 through
Step 11 of
“Troubleshooting for
CAN-DTC”.
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?
Identify malfunction
control module by
performing Step 13
through Step 14 of
“Troubleshooting for
CAN-DTC”. Go to Step 10.
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
Ω
?
Substitute a known-
good TCM and recheck. Substitute a known-
good ECM and recheck.
Step Action Yes No