Suzuki Ignis Service Manual page 3282

Step
3 Check ECM voltage.
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, check
voltage between "LT GRN" wire terminal
and vehicle body ground. See Fig. 1.
Is voltage about 4 – 6 V?
4 Check ECT sensor circuit insulation.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between "LT GRN" wire
terminal of ECT sensor connector and body
ground.
Is resistance infinity?
5 Check ECT sensor short circuit.
1) Turn ON ignition switch.
2) Check voltage between "LT GRN" wire ter-
minal of ECT sensor connector and vehicle
body ground.
Is voltage about 0 V?
6 Check ECT sensor according to "Engine cool-
ant temperature sensor (ECT sensor) inspec-
tion" in Section 6E1.
Is it in good condition?
Action
[A]: Fig. 1 for Step 3
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-81
Yes
Got to Step 6.
Got to Step 5.
Got to Step 6.
Substitute a known-good
ECM and recheck.
No
Go to Step 4.
"LT GRN" wire shorted to
ground circuit.
If wire are OK, substitute
a known-good ECM and
recheck.
"LT GRN" wire shorted to
other circuits.
If wire are OK, substitute
a known-good ECM and
recheck.
Replace ECT sensor.