Honda NSS250S Manual page 185

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3. IAT Sensor Output Line Short Circuit Inspection
Turn the ignition switch OFF.
Check the continuity between the sensor unit 5P
connector terminal of the wire side and ground.
CONNECTION: White/blue – Ground
Is there continuity?
YES – Short circuit in White/blue wire
NO – Replace the ECM with a known good
one, and recheck.
DTC 9-2 (IAT SENSOR HIGH VOLTAGE)
1. IAT Sensor System Inspection
Turn the ignition switch ON and engine stop
switch " ".
Check the IAT sensor with the HDS pocket tester.
Is about 5 V indicated?
YES – GO TO STEP 2.
NO – • Intermittent failure
• Loose or poor contact on the sensor
unit 5P (Black) connector
2. Sensor Unit Power Line Inspection
Check the sensor unit power line inspection
(page 6-20).
Is the sensor unit power line normal?
YES – GO TO STEP 3.
NO – Replace or repair the abnormal circuit.
3. IAT Sensor Inspection
Turn the ignition switch OFF.
Disconnect the sensor unit 5P (Black) connector.
Connect the sensor unit 5P connector terminals
with a jumper wire.
CONNECTION: White/blue – Green/orange
Turn the ignition switch ON and engine stop
switch " ".
Check the IAT sensor with HDS pocket tester.
Is about 0 V indicated?
YES – Faulty sensor unit (IAT sensor)
NO – GO TO STEP 4.
FUEL SYSTEM (PGM-FI)
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
White/blue
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
White/blue Green/orange
JUMPER WIRE
6-31