AUTOMATIC TRANSAXLE (M13 ENGINE) 7B1-77
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.
Is resistance 1
Ω
or less?
Go to Step 3. “RED” wire circuit open or
high resistance.
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?
Go to Step 4. “RED” wire circuit shorted
to power circuit.
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?
Go to Step 5. “RED” wire circuit shorted
to ground.
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
Is resistance 1
Ω
or less?
Go to Step 6. “WHT” wire circuit open or
high resistance.
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?
Go to Step 7. “WHT” wire circuit shorted
to power circuit.
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?
Substitute a known-
good TCM and
recheck.
If OK, substitute a
known-good ECM and
recheck.
“WHT” wire circuit shorted
to ground.
Step Action Yes No
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