Suzuki GA413, Service Manual

Page: 822 / 1246

6-46 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
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?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0 A.
3 Check Wire Harness.
1) Disconnect ECT sensor connector.
2) Check engine coolant temp. displayed on scan
tool.
Is – 40 C (– 40 F) indicated?
Replace ECT sensor. “LT GRN/WHT” wire
shorted to ground.
If wire is OK, substitute
a known-good ECM and
recheck.
4 Does scan tool indicate –40 C (–40 F) at Step 2. Go to Step 6. Go to Step 5.
5 Check Wire Harness.
1) Disconnect ECT sensor connector with ignition
switch OFF.
2) Check for proper connection to ECT sensor at
“BLU/YEL” and “LT GRN/WHT” wire terminals.
3) If OK, then with ignition switch ON, is voltage
applied to “LT GRN/WHT” wire terminal about
4 – 6 V?
See Fig. 1.
Go to Step 4. “LT GRN/WHT” wire
open or shorted to pow-
er, or poor C23-32 con-
nection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
6 Check Wire Harness.
1) Using service wire, connect ECT sensor
connector terminals. See Fig. 2.
2) Turn ignition switch ON and check engine
coolant temp. displayed on scan tool.
Is 119 C (246 F) indicated?
Replace ECT sensor. “BLU/YEL” wire open or
poor C23-34 connec-
tion.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
Fig. 1 for Step 5 Fig. 2 for Step 6