Engine General Information and Diagnosis: 1A-41
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 trouble shooting, 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: ”.
Step
Action
Yes
No
1
DTC check
1) Start engine and recheck DTC of ECM and TCM while
engine running.
Is there any DTC(s)?
Go to Step 2 of “Engine
and Emission Control
System Check: ” or 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 or TCM (equipped with A/
T) referring to Step 9 to 14 “DTC P1674: CAN
Communication (Bus Off Error): ”.
Is circuit in good condition?
Substitute a known-
good combination meter
and recheck. If MIL still
remains OFF, substitute
a known-good ECM and
recheck.
Repair or replace CAN
communication circuit.
Содержание SWIFT RS415 2017
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