Engine General Information and Diagnosis: 1A-77
DTC 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: ”.
• Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and
confirm that the trouble has been corrected.
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”.
2
ECT sensor and its circuit check
1) Connect scan tool with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Check engine coolant temp. displayed on scan tool.
Is 119
q
C (246
q
F) indicated?
Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
3
ECM voltage check
1) Disconnect connector from ECT sensor with ignition
switch turned OFF.
2) Check for proper connection to ECT sensor at “LT GRN”
and “ORN” wire terminals.
3) If OK, then turn ON ignition switch, measure voltage
between “LT GRN” wire terminal of ECT sensor
connector and vehicle body ground.
Is voltage about 4 – 6 V?
Go to Step 6.
Go to Step 4.
4
ECT sensor short circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “LT GRN” wire terminal of
ECT sensor connector and vehicle body ground.
Is resistance infinity?
Go to Step 5.
“LT GRN” wire is
shorted to ground
circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
5
ECT sensor short circuit check
1) Turn ON ignition switch.
2) Measure voltage between “LT GRN” wire terminal of
ECT sensor connector and vehicle body ground.
Is voltage about 0 V?
Go to Step 6.
“LT GRN” wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
6
ECT sensor for performance check
1) Check ECT sensor according to “Engine Coolant
Temperature (ECT) Sensor Inspection: in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace ECT sensor.
I4RS0A110026-
Содержание SWIFT RS415 2017
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Страница 331: ...Engine Lubrication System 1E 2 I3RH0B150001...
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