Suzuki GA413, Service Manual

Page: 820 / 1246

6-44 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 IAT Sensor and Its Circuit.
1) Connect scan tool to DLC with ignition switch
OFF.
2) Turn ignition switch ON.
3) Check intake air temp. displayed on scan tool.
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 0A.
3 Check Wire Harness.
1) Disconnect IAT sensor connector with ignition
switch OFF.
2) Check for proper connection to IAT sensor at
“LT GRN/BLK” and “BLU/YEL” wire terminals.
3) If OK, then with ignition switch ON, is voltage
applied to “LT GRN/BLK” wire terminal about
4 – 6 V? See Fig. 1.
Go to Step 5. “LT GRN/BLK” wire
open or shorted to pow-
er, or poor C23-23 con-
nection.
If wire and connection
are 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) Check intake air temp. displayed on scan tool
with ignition switch ON.
Is – 40 C (– 40 F) indicated?
Replace IAT sensor. “LT GRN/BLK” wire
shorted to ground.
If wire is OK, substitute
a known-good ECM and
recheck.
6 Check Wire Harness.
1) Using service wire, connect IAT sensor connec-
tor terminals.
2) Check intake air temp. displayed on scan tool
with ignition switch ON. See Fig. 2.
Is 119 C (246 F) indicated?
Replace IAT sensor. “LT GRN/BLK” wire
open or poor C23-34
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
Fig. 1 for Step 3 Fig. 2 for Step 4