Honda NSS250S Manual page 216

FUEL SYSTEM (PGM-FI)
MIL 9 BLINKS (IAT SENSOR)
1. Sensor Unit Power Line Inspection
Check the sensor unit power line inspection
(page 6-22).
Is the sensor unit power line normal?
YES
NO
2. IAT Sensor Output Voltage Inspection
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at the test harness termi-
nals.
CONNECTION: 7 (+) – 10 (–)
STANDARD:
Is the voltage within 2.7 – 3.1 V (20 ° C/68 ° F)?
YES
NO
3. IAT Sensor Input Voltage Inspection
Turn the ignition switch OFF.
Disconnect the sensor unit 5P (Black) connector.
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at the sensor unit 5P con-
nector of the wire side.
CONNECTION: White/blue (+) – Green/orange (–)
STANDARD:
Is the voltage within 4.75 – 5.25 V?
YES
NO
4. IAT Sensor Voltage Input Line Short Circuit
Inspection
Turn the ignition switch OFF.
Check the continuity between the sensor unit 5P
connector of the wire side and ground.
CONNECTION: White/blue – Ground
Is there continuity?
YES
NO
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– GO TO STEP 2.
– Replace or repair the abnormal circuit.
2.7 – 3.1 V (20°C/68°F)
– • Intermittent failure
• Loose or poor contact on the PCM
connector
– GO TO STEP 3.
4.75 – 5.25 V
– GO TO STEP 6.
– GO TO STEP 4.
– Short circuit in White/blue wire
– GO TO STEP 5.
TEST HARNESS PIN BOX
(7)
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
White/blue
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
White/blue
(10)
Green/orange