Engine General Information and Diagnosis: 1A-151
Troubleshooting
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 in ECM
1) Check ECM for DTC.
Is there DTC P1674?
Go to “DTC P1674:
CAN Communication
(Bus Off Error)”.
Go to Step 3.
3 ECM and ABS/ESP® control module connector check
1) Check for proper connection at each ECM and ABS/
ESP® control module connector terminals with ignition
switch turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1685?
Go to Step 4. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
4 DTC check of ABS/ESP® control module
1) Check DTC U1073 in ABS/ESP® control module.
Is it indicated?
Go to “DTC U1073:
Control Module
Communication Bus Off
in Section 4E” (Non-
ESP® model) or “DTC
U1073: Control Module
Communication Bus Off
in Section 4F” (ESP®
module).
Go to Step 5.
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors form ECM and ABS/ESP®
control module.
3) Check CAN communication circuit between ECM and
ABS/ESP® control module for open, short or high
resistance.
Is each CAN communication circuit in good condition?
Go to Step 6. Repair circuit.
6 DTC check in ECM
1) Connect connectors to ECM and ABS/ESP® control
module with ignition switch turned.
2) Check ECM for DTC.
Does ECM communicate with control module other than
ABS/ESP
®
control module (i.e. DTC P1676 and/or DTC
P1678 are not detected)?
Substitute a known-
good ABS/ESP®
control module and
recheck.
Substitute a known-
good ECM and recheck.
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