Suzuki WagonR+ RB310 Service Manual page 2407

6-48 ENGINE DIAGNOSIS
INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
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.
See Fig. 1.
Is –40_C (–40_F) or 119_C (246_F) indicated?
3 Check Wire Harness.
1) Disconnect IAT sensor connector with ignition
switch OFF.
2) Check for proper connection to IAT sensor at
"Lg" and "Br/W" wire terminals.
3) If OK, then with ignition switch ON, is voltage
applied to "Lg" wire terminal about 4 – 6 V? See
Fig. 2.
4 Does scan tool indicate –40_C (–40_F) at Step 2.
5 Check Wire Harness
1) Check intake air temp. displayed on scan tool
with ignition switch ON.
Is –40_C (–40_F) indicated?
6 Check Wire Harness.
1) Using service wire, connect IAT sensor
connector terminals.
2) Check intake air temp. displayed on scan tool
with ignition switch ON. See Fig. 3.
Is 119_C (246_F) indicated?
Fig. 1 for Step 2
ACTION
Fig. 2 for Step 3
YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 6.
Replace IAT sensor.
Replace IAT 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 0A.
"Lg" wire open or
shorted to power, or
poor E21-15
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
Go to Step 5.
"Lg" wire shorted to
ground.
If wire is OK, substitute
a known-good ECM and
recheck.
"Lg" wire open or poor
E21-10 connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.