Engine General Information and Diagnosis: 1A-180
DTC P1678: CAN Communication (Reception Error for BCM)
S5JB0A1104061
Wiring Diagram
Refer to “DTC P1674: CAN Communication (Bus Off Error): ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
17
DTC check in BCM
1) Connect connectors to all control modules
communicating by CAN with ignition switch turned OFF.
2) Check DTC U1101 in BCM.
Is it indicated?
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck.
Substitute a known-
good ECM and recheck.
Step
Action
Yes
No
DTC detecting condition
Trouble area
Reception error of communication data for BCM is
detected for longer than specified time continuously.
(1 driving detection logic but MIL does not light up)
• ECM
• BCM
• CAN communication line circuit
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”.
2
DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM, TCM (for A/T model), ABS hydraulic unit /
control module assembly, 4WD control module (for J20
engine), keyless start control module (if equipped) and
BCM for DTC.
Is there any DTC(s) other than CAN communication DTC(s)
at each control module (other than DTC P1618, P1674,
P1676, P1678, P1685 in ECM, DTC P1774, P1777, P1778
in TCM (for A/T model), DTC U1073, U1100, U1101, U1121
in BCM, ABS hydraulic unit / control module assembly and
4WD control module (for J20 engine), and DTC No.31 / 33 in
keyless start control module (if equipped))?
Go to applicable DTC
diag. flow.
Go to Step 3.
3
CAN communication error check for ECM
1) Check ECM for DTC.
Is there DTC P1674?
Go to “DTC P1674:
CAN Communication
(Bus Off Error): ”.
Go to Step 4.
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