Suzuki Swift Sport 2004 Service & Repair Manual page 130

1A-80 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
• 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
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 119 C (246 F) indicated?
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?
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 "ECT Sensor Inspection
in Section 1C".
Is it in good condition?
Action
I4RS0A110026-01
Yes
Go to Step 2.
Go to Step 3.
Go to Step 6.
Go to Step 5.
Go to Step 6.
Substitute a known-
good ECM and recheck.
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.
"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.