Honda NSS250S Manual page 197

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2. IAT Sensor Inspection
Turn the ignition switch OFF.
Disconnect the sensor unit 5P (Black) connector.
Turn the ignition switch ON and engine stop
switch " ".
Check the IAT sensor with the HDS pocket tester.
Is about 0 V indicated?
YES – GO TO STEP 3.
NO – Faulty sensor unit (IAT sensor)
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 PCM 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 6-22).
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
6-43