Honda NSS250A Reflex 2001-2007, Manual

Page: 216 / 718

FUEL SYSTEM (PGM-FI)
6-62
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 – GO TO STEP 2.
NO – Replace or repair the abnormal circuit.
2. IAT Sensor Output Voltage Inspection
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at the test harness termi-
nals.
Is the voltage within 2.7 – 3.1 V (20
°
C/68
°
F)?
YES – • Intermittent failure
• Loose or poor contact on the PCM
connector
NO – GO TO STEP 3.
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.
Is the voltage within 4.75 – 5.25 V?
YES – GO TO STEP 6.
NO – GO TO STEP 4.
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.
Is there continuity?
YES – Short circuit in White/blue wire
NO – GO TO STEP 5.
CONNECTION: 7 (+) – 10 (–)
STANDARD:
2.7 – 3.1 V (20
°
C/68
°
F)
(7) (10)
TEST HARNESS PIN BOX
CONNECTION: White/blue (+) – Green/orange (–)
STANDARD:
4.75 – 5.25 V
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
White/blue Green/orange
CONNECTION: White/blue – Ground
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
White/blue
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