1A-59 Engine General Information and Diagnosis:
Malfunction Indicator Lamp Remains ON after Engine Starts
S5JB0A1104012
Wiring Diagram
Refer to “Malfunction Indicator Lamp Does Not Come ON with Ignition Switch ON and Engine Stop (but Engine Can
Be Started): ”.
Circuit Description
When the ignition switch is turned ON, ECM causes the main relay to turn ON (close the contact point). Then, ECM
being supplied with the main power, transmits indication ON signal of malfunction indicator lamp (MIL) to combination
meter in order to turn MIL ON. And then, combination meter turns MIL ON. When the engine starts to run and no
malfunction is detected in the system, ECM transmits MIL indication OFF signal to combination meter in order to turn
MIL OFF. And then, combination meter turns MIL OFF, but if a malfunction was or is detected, MIL remains ON even
when the engine is running.
Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection: ”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits: ”.
8
Combination meter circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between “G28-15” terminal of
combination meter connector and vehicle body ground.
Is resistance 1
Ω
or less?
Substitute a known-
good combination meter
and recheck. If MIL still
remains OFF, substitute
a known-good ECM and
recheck.
“BLK” wire is open or
high resistance circuit.
Step
Action
Yes
No
Step
Action
Yes
No
1
DTC check
1) Start engine and recheck DTC of ECM and TCM (for A/T
model) while engine running.
Is there any DTC(s)?
Go to Step 2 of “Engine
and Emission Control
System Check: ”, Step 2
of “A/T System Check:
in Section 5A”.
Go to Step 2.
2
CAN communication line circuit check
1) Check CAN communication line circuit between
combination meter and ECM, TCM (for A/T model), ABS
hydraulic unit / control module assembly, 4WD control
module (for J20 engine), keyless start control module (if
equipped) referring to Step 9 to 15 “DTC P1674: CAN
Communication (Bus Off Error): ”.
Is circuit in good condition?
Substitute a known-
good combination meter
and recheck. If MIL still
remains ON, substitute
a known-good ECM and
recheck.
Repair or replace CAN
communication circuit.
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