1A-185 Engine General Information and Diagnosis:
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 ABS hydraulic unit / control module
assembly
1) Check DTC U1073 in ABS hydraulic unit / control
module assembly.
Is it indicated?
Go to “DTC U1073:
Control Module
Communication Bus
Off: in Section 4E”.
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 P1685?
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 P1685?
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.
9
DTC check in ECM
1) Disconnect connector from keyless start control module
(if equipped) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
Go to Step 10.
“G44-19” or “G44-18”
circuit wire between
keyless start control
module and CAN circuit
junction connector is
open or high resistance.
If wires are OK,
substitute a known-
good keyless start
control module and
recheck.
10
DTC check in ECM
1) Disconnect connector from combination meter with
ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
Go to Step 11.
“G28-10” or “G28-8”
circuit wire between
combination meter and
CAN circuit junction
connector is open or
high resistance. If wires
are OK, substitute a
known-good
combination meter or
keyless start control
module (if equipped)
and recheck.
Step
Action
Yes
No
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