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10B-26 Body Electrical Control System:
Troubleshooting
Step
1
Check each control unit connectors
1) Check connection of connectors of all control modules
(BCM, ECM, TCM (if equipped) and combination meter)
communicating by means of CAN.
2) Recheck DTC.
Is DTC U1073 detected?
2
CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
3
Check DTC in BCM
NOTE:
If vehicle equipped with M/T, go to Step 4.
1) Turn ignition switch to OFF position.
2) Connect connectors to combination meter, BCM and
ECM.
3) Recheck BCM for DTC.
Is DTC U1073 detected?
4
Check DTC in BCM
1) Turn ignition switch to OFF position.
2) Connect connectors to combination meter and BCM.
3) Recheck BCM for DTC.
Is DTC U1073 detected?
5
Check DTC in BCM
1) Turn ignition switch to OFF position.
2) Disconnect connector from combination meter.
3) Recheck BCM for DTC.
Is DTC U1073 detected?
Action
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Check BCM power and
ground circuit. If circuit
is OK, substitute a
known-good BCM
(included in junction
block assembly) and
recheck.
No
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Repair circuit.
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck.
Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.
Check combination
meter power and
ground circuit. If circuit
is OK, substitute a
known-good
combination meter and
recheck.
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