Suzuki 2006 SX4 Service Manual page 134

1A-84 Engine General Information and Diagnosis:
Step
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 "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 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?
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?
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?
Action
I5RW0A110025-01
Yes
Go to Step 6.
Go to Step 5.
Go to Step 6.
Substitute a known-
good ECM and recheck.
No
Go to Step 4.
"LT GRN" wire is
shorted to ground
circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
"LT GRN" wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
Replace ECT sensor.