Suzuki SWIFT RS415 2017, Service Manual

Page: 127 / 1257

Engine General Information and Diagnosis: 1A-79
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 –40
q
C (–40
q
F) indicated?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
3 ECT 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 ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Check for proper connection of ECM connector at “C37-
24” terminal.
4) If OK, then turn ON ignition switch, measure voltage
between “C37-24” wire terminal of ECM connector and
vehicle body ground.
Is voltage about 4 – 6 V?
“LT GRN” wire is open
circuit. If wire and
connection are OK, go
to Step 5. Go to Step 5.
5 ECT sensor harness voltage check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Turn ON ignition switch.
3) 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 harness resistance check
1) Measure resistance between “C37-24” terminal of ECM
connector and “LT GRN” wire terminal of ECT sensor
connector with ignition switch turn OFF.
Is resistance below 5
:
?
Go to Step 7. “LT GRN” wire is high
resistance circuit.
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