Suzuki GA413 Service Manual page 440

6E-30 ENGINE AND EMISSION CONTROL SYSTEM
DTC NO.18 INTAKE AIR TEMPERATURE SENSOR CIRCUIT
(SIGNAL VOLTAGE LOW OR HIGH)
WIRING DIAGRAM
TROUBLE SHOOTING
STEP
1 Did you perform "ENGINE DIAGNOSTIC FLOW
TABLE" in Section 6?
2 1) With ignition switch OFF position, disconnect
IAT sensor electrical connector.
2) Turn ignition switch ON position, leaving en-
gine OFF.
3) Measure voltage from terminal "b" of IAT
sensor connector to ground.
Is voltage within 4-5V?
3 1) Connect jumper wire from terminal "a" to "b"
of IAT sensor connector.
2) Measure voltage from terminal "b" of IAT
sensor connector to ground.
Is voltage below 0.15V?
4 1) Perform "IAT sensor inspection" in this sec-
tion.
Is resistance within specified value?
NOTE:
Upon completion of inspection and repair work, perform "DTC Confirmation Procedure" in this section and
confirm that the trouble has been corrected.
ACTION YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Poor connection of IAT
sensor connector terminal.
If OK, substitute a known-
good ECM and recheck.
1. IAT sensor
2. IAT sensor connector
3. ECM connector
4. ECM
NO
Go to"ENGINE DIAG-
NOSTIC FLOW TABLE".
"Lg/B" wire open or short.
Poor connection of ECM
connector terminal.
If OK, substitute a
known-good ECM and
recheck.
"Bl/Y" wire open.
Poor connection of ECM
connector terminal.
If OK, substitute a
known-good ECM and
recheck.
Faulty IAT sensor.