Suzuki SX4 Service Manual page 135

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DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC Troubleshooting".
Step
1
Was "Engine and Emission Control System Check"
performed?
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
C (–40
F) indicated?
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 "GRY/BLU" 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?
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 "C01-
24" terminal.
4) If OK, then turn ON ignition switch, measure voltage
between "C01-24" wire terminal of ECM connector and
vehicle body ground.
Is voltage about 4 – 6 V?
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?
Action
I5RW0A110025-01
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 6.
"LT GRN" wire is open
circuit. If wire and
connection are OK, go
to Step 5.
Go to Step 6.
1A-85
No
Go to "Engine and
Emission Control
System Check".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to Step 4.
Go to Step 5.
"LT GRN" wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.

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