Suzuki Wagon R Plus RB310 Service Manual page 646

Step
2 Check CAN communication circuit for open.
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM and TCM.
3) Check for proper connection to "E21-7" termi-
nal of ECM connector and "E13-7" terminal of
TCM connector.
If OK, measure resistance between "E21-7" termi-
nal of ECM connector and "E13-7" terminal of TCM
connector.
Ω
Is resistance 1
3 Check CAN communication circuit for power short.
1) Turn ignition switch to ON position.
2) Measure voltage between "E13-7" terminal of
TCM connector and vehicle body ground.
Is voltage 0 – 1 V?
4 Check CAN communication circuit for ground
short.
1) Turn ignition switch to OFF position.
2) Measure resistance between "E21-7" terminal
of ECM connector and vehicle body ground.
Is it infinite?
5 Check CAN communication circuit for open.
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM and TCM.
3) Check for proper connection to "E21-8" termi-
nal of ECM connector and "E13-17" terminal of
TCM connector.
4) If OK, measure resistance between "E21-8"
terminal of ECM connector and "E13-17" termi-
nal of TCM connector
Ω
Is resistance 1
6 Check CAN communication circuit for power short.
1) Turn ignition switch to ON position.
2) Measure voltage between "E13-17" terminal of
TCM connector and vehicle body ground.
Is voltage 0 – 1 V?
7 Check CAN communication circuit for ground
short.
1) Turn ignition switch to OFF position.
2) Measure resistance between "E13-17" terminal
of ECM connector and vehicle body ground.
Is it infinite?
Action
or less?
or less?
AUTOMATIC TRANSAXLE (M13 ENGINE) 7B1-77
Yes
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Substitute a known-
good TCM and
recheck.
If OK, substitute a
known-good ECM and
recheck.
No
"RED" wire circuit open or
high resistance.
"RED" wire circuit shorted
to power circuit.
"RED" wire circuit shorted
to ground.
"WHT" wire circuit open or
high resistance.
"WHT" wire circuit shorted
to power circuit.
"WHT" wire circuit shorted
to ground.