Honda NSS250S Manual page 206

FUEL SYSTEM (PGM-FI)
3. TP Sensor Output Line Short Circuit Inspection
Turn the ignition switch OFF.
Disconnect the ECM 33P (Black) connector.
Disconnect the sensor unit 5P (Black) connector.
Check the continuity between the sensor unit 5P
connector of the wire side and ground.
CONNECTION: White/red – Ground
Is there continuity?
YES
NO
4. TP Sensor Voltage Input Line Open Circuit
Inspection
Check the continuity between the sensor unit 5P
connector of the wire side and test harness.
CONNECTION: 5 – White/red
Is there continuity?
YES
NO
MIL 9 BLINKS (IAT SENSOR)
1. Sensor Unit Power Line Inspection
Check the sensor unit power line inspection
(page 6-20).
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: 14 (+) – 4 (–)
STANDARD:
Is the voltage within 2.7 – 3.1 V (20 ° C/68 ° F)?
YES
NO
6-52
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– Short circuit in White/red wire
– GO TO STEP 4.
– • Faulty sensor unit (TP sensor)
• Replace the ECM with a known good
one, and recheck.
– Open circuit in White/red wire
– 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 ECM
connector
– GO TO STEP 3.
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
(5)
TEST HARNESS PIN BOX
TEST HARNESS PIN BOX
(14) (4)
White/red
White/red