Honda NSS250S Manual page 204

FUEL SYSTEM (PGM-FI)
MIL 7 BLINKS (ECT SENSOR)
• Before starting the inspection, check for loose or
poor contact on the ECT sensor 3P (Gray) con-
nector and recheck the MIL blinking.
1. ECT Sensor Output Voltage Inspection
Connect the test harness to the ECM 33P (Black)
connector (page 6-17).
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at the test harness termi-
nals.
CONNECTION: 24 (+) – 4 (–)
STANDARD:
Is the voltage within 2.7 – 3.1 V (20 ° C/68 ° F)?
YES
NO
2. ECT Sensor Input Voltage Inspection
Turn the ignition switch OFF.
Disconnect the ECT sensor 3P (Gray) connector.
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at the ECT sensor 3P con-
nector of the wire side and ground.
CONNECTION: Pink/white (+) – Ground
STANDARD:
Is the voltage within 4.75 – 5.25 V?
YES
NO
3. ECT Sensor Open Circuit Inspection
Turn the ignition switch OFF.
Check the continuity between the test harness
and ECT sensor 3P connector of the wire side.
CONNECTION: 24 – Pink/white
Is there continuity?
YES
NO
6-50
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2.7 – 3.1 V (20°C/68°F)
– • Loose or poor contact on the ECM
connector
• Intermittent failure
– GO TO STEP 2.
4.75 – 5.25 V
– GO TO STEP 5.
– GO TO STEP 3.
4 – Green/orange
– GO TO STEP 4.
– • Open circuit in Pink/white wire
• Open circuit in Green/orange wire
TEST HARNESS PIN BOX
(24)
ECT SENSOR 3P CONNECTOR
(Wire side/female terminals)
Pink/white
TEST HARNESS PIN BOX
(4)
(24)
ECT SENSOR 3P CONNECTOR
(Wire side/female terminals)
(4)
Green/orange
Pink/
white