Suzuki Swift User Manual page 205

INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check ECT Sensor and Its Circuit.
1) Connect scan tool with ignition switch OFF.
2) Turn ignition switch ON.
3) Check engine coolant temp. displayed on scan
tool. See Fig. 1.
Is –40_C (–40_F) or 119_C (246_F) indicated?
3 Check Wire Harness.
1) Disconnect ECT sensor connector.
2) Check engine coolant temp. displayed on scan
tool.
Is –40_C (–40_F) indicated?
4 Does scan tool indicate –40_C (–40_F) at Step 2.
5 Check Wire Harness.
1) Disconnect ECT sensor connector with
ignition switch OFF.
2) Check for proper connection to ECT sensor at
"G" and "Lg/R" wire terminals.
3) If OK, then with ignition switch ON, is voltage
applied to "G" wire terminal about 4 – 6 V?
See Fig. 2.
6 Check Wire Harness.
1) Using service wire, connect ECT sensor
connector terminals. See Fig. 3.
2) Turn ignition switch ON and check engine
coolant temp. displayed on scan tool.
Is 119_C (246_F) indicated?
Fig. 1 for Step 2
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-49
ACTION
Fig. 2 for Step 5
YES
Go to Step 2.
Go to Step 3.
Replace ECT sensor.
Go to Step 6.
Go to Step 4.
Replace ECT sensor.
Fig. 3 for Step 6
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection"
in Section 0 A.
"Lg/R" wire shorted to
ground.
If wire is OK, substitute
a known-good ECM
(PCM) and recheck.
Go to Step 5.
"Lg/R" wire open or
shorted to power, or
poor C01-14
connection.
If wire and connection
are OK, substitute a
known-good ECM
(PCM) and recheck.
"G" wire open or poor
C01-10 connection.
If wire and connection
are OK, substitute a
known-good ECM
(PCM) and recheck.