1A-173 Engine General Information and Diagnosis:
3
ECM, TCM (for A/T model), BCM, ABS hydraulic unit /
control module assembly, 4WD control module (for J20
engine), combination meter and keyless start control
module (if equipped) connectors check
1) Check for proper connection at each ECM, TCM (for A/T
model), BCM, ABS hydraulic unit / control module
assembly, 4WD control module (for J20 engine),
combination meter and keyless start control module (if
equipped) connector terminals with ignition switch
turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1674?
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
4
ECM power and ground circuit check
1) Check ECM power and ground circuit referring to “ECM
Power and Ground Circuit Check: ”.
Are they in good condition?
Go to Step 5.
Repair ECM power and/
or ground circuits.
5
DTC check in BCM, TCM (for A/T model), ABS hydraulic
unit / control module assembly, 4WD control module
(for J20 engine) and keyless start control module (if
equipped) (bus off)
1) Check DTC(s) in TCM (for A/T model), ABS hydraulic
unit / control module assembly, 4WD control module (for
J20 engine) and BCM.
Is there DTC(s) P1774 in TCM (for A/T model), U1073 in
BCM, ABS hydraulic unit / control module assembly and
4WD control module (for J20 engine) and/or DTC No.33 in
keyless start control module (if equipped)?
Go to Step 6.
Go to Step 7.
6
DTC check in ECM (bus off)
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check TCM (for A/T model), BCM, ABS hydraulic unit /
control module assembly and 4WD control module (for
J20 engine) for DTC(s).
Is there DTC(s) P1774 in TCM (for A/T model), U1073 in
BCM, ABS hydraulic unit / control module assembly and
4WD control module (for J20 engine) and/or DTC No.33 in
keyless start control module (if equipped)?
Go to Step 7.
“E23-4” or “E23-19”
circuit wire between
ECM and ABS hydraulic
unit / control module is
open or high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.
7
DTC check in ECM
1) Connect connectors to ECM and disconnect connector
from BCM with ignition switch turned OFF.
2) Check ECM for DTC(s).
Is there DTC P1674?
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.
8
DTC check in ECM
1) Disconnect connectors from TCM (for A/T model) with
ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1674?
Go to Step 9.
“E92-17” or “E92-7”
circuit wire between
TCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK,
substitute a known-
good TCM (for A/T
model) and recheck.
Step
Action
Yes
No
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