Suzuki GA413 Service Manual page 442

6E-32 ENGINE AND EMISSION CONTROL SYSTEM
DTC NO.19 ENGINE COOLANT 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
ECT sensor electrical connector.
2) Turn ignition switch ON position, leaving en-
gine OFF.
3) Measure voltage from terminal "c" of ECT sen-
sor connector to ground.
Is voltage within 4-5V?
3 1) Connect jumper wire from terminal "a" to "c" of
ECT sensor connector.
2) Measure voltage from terminal "c" of IAT sen-
sor connector to ground.
Is voltage below 0.15V?
4 1) Perform "ECT 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 ECT
sensor connector termi-
nal.
If OK, substitute a known-
good ECM and recheck.
1. ECT sensor
2. ECT sensor connector
3. Combination meter
4. ECM connector
5. ECM
NO
Go to"ENGINE DIAG-
NOSTIC FLOW TABLE".
"Lg/W" wire open or short.
Poor connection of ECM
connector terminal.
If OK, substitute a known-
good ECM and recheck.
"BI/Y" wire open.
Poor connection of ECM
connector terminal.
If OK, substitute a known-
good ECM and recheck.
Faulty ECT sensor.