1A-177 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC 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
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
Check CAN communication error for ECM
1) Check ECM for DTC.
Is there DTC P1674?
Go to “DTC P1674:
CAN Communication
(Bus Off Error): ”.
Go to Step 4.
4
ECM, ABS hydraulic unit / control module and TCM (for
A/T model) connector check
1) Check for proper connection at each ECM, ABS
hydraulic unit / control module and TCM (for A/T model)
connector terminals with ignition switch turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1676?
Go to Step 5.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
5
ECM power and ground circuit check
1) Check ECM power and ground circuits referring to “ECM
Power and Ground Circuit Check: ”.
Are they in good condition?
Go to Step 6.
Repair ECM power and/
or ground circuits.
6
DTC check in TCM (for A/T model)
1) Check DTC P1774 in TCM (for A/T model).
Is it indicated?
Go to “DTC P1774:
CAN Communication
Bus Off: in Section 5A”.
Go to Step 7.
7
DTC check in ECM
1) Disconnect connector from BCM with ignition switch
turned OFF.
2) Check ECM for DTC(s).
Is there DTC P1676?
Go to Step 8.
“G31-1” or “G31-3”
circuit wire between
BCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK,
substitute a known-
good BCM and recheck.
www.CarGarage.ir
www.CarGarage.ir
www.CarGarage.ir
