Engine General Information and Diagnosis: 1A-186
11
DTC check in ECM
1) Disconnect connector from 4WD control module (for J20
engine) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
Go to Step 12.
“E91-22” or “E91-23”
circuit wire between
4WD control module
and CAN circuit junction
connector is open or
high resistance. If wires
are OK, substitute a
known-good 4WD
control module and
recheck.
12
CAN communication line circuit continuity check
1) Disconnect connectors from all control modules
communicating by CAN with ignition switch turned OFF.
2) Measure resistance at following connector terminals.
• Between “E23-4” terminal of ECM connector and
“E03-10” terminal of ABS hydraulic unit / control
module connector
• Between “E23-19” terminal of ECM connector and
“E03-8” terminal of ABS hydraulic unit / control
module connector
Is each resistance below 1
Ω
?
Go to Step 13.
Repair open or high
resistance of CAN
communication line
circuit referring to
“Precaution for CAN
Communication
System: in Section 00”.
13
CAN communication line circuit insulation check
1) Measure resistance between “E23-4” and “E23-19”
terminals of ECM connector.
Is resistance infinity?
Go to Step 14.
Repair insulation of
CAN communication
line circuit referring to
“Precaution for CAN
Communication
System: in Section 00”.
14
CAN communication line circuit ground short check
1) Measure resistance at following connector terminals.
• Between “E23-4” terminal of ECM connector and
vehicle body ground
• Between “E23-19” terminal of ECM connector and
vehicle body ground
Is each resistance infinity?
Go to Step 15.
Repair short to ground
of CAN communication
line circuit referring to
“Precaution for CAN
Communication
System: in Section 00”.
15
Check for short circuit of CAN communication line to
power circuit
1) Measure voltage at following connector terminals with
ignition switch turned ON.
• Between “E23-4” terminal of ECM connector and
vehicle body ground
• Between “E23-19” terminal of ECM connector and
vehicle body ground
Is each voltage 0 – 1 V?
Go to Step 16.
Repair short to power
supply of CAN
communication line
circuit referring to
“Precaution for CAN
Communication
System: in Section 00”.
16
ECM circuit check
1) Connect connector to ABS hydraulic unit / control
module with ignition switch turned OFF.
2) Measure resistance at following connector terminals.
• Between “E03-8” and “E03-6” terminals of ABS
hydraulic unit / control module connector
• Between “E03-10” and “E03-12” terminals of ABS
hydraulic unit / control module connector
Is resistance below 1
Ω
?
Go to Step 17.
Substitute a known-
good ABS hydraulic unit
/ control module
assembly and recheck.
Step
Action
Yes
No
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