Honda SH300 2006 Manual page 147

3. IAT Sensor Resistance Inspection
Turn the ignition switch OFF.
Measure the resistance at the IAT sensor termi-
nals.
CONNECTION: White/blue – Green/orange
STANDARD: 1 – 4 kΩ (20°C/68°F)
Is the resistance within 1 – 4 kΩ?
YES – Replace the ECM with new one, and
recheck; refer to Key Registration Proce-
dures (page 23-4)
NO – Replace the sensor unit with a new one,
and recheck (Faulty IAT sensor).
4. IAT Sensor Output/Ground Line Open Circuit
Inspection
Turn the ignition switch OFF.
Check the continuity between the sensor unit 5P
(Black) connector terminal and test harness ter-
minal.
Connection: A14 – White/Blue
A4 – Green/Orange
Is there continuity?
YES – GO TO STEP 5.
NO – • Open circuit in White/Blue wire
• Open circuit in Green/Orange wire
5. IAT Sensor Output Line Short Circuit Inspection
Disconnect the test harness and ECM 33P con-
nector disconnected.
Check for continuity between the sensor unit 5P
(Black) connector terminal of the wire harness
side and ground.
Connection: White/Blue – Ground
Is there continuity?
YES – Short circuit in White/Blue wire
NO – Replace the ECM with new one, and
recheck; refer to Key Registration Proce-
dures (page 23-4)
FUEL SYSTEM (PGM-FI)
5P (Black) CONNECTOR
(Sensor side of male terminals)
G/O
5P (Black) CONNECTOR
(Wire side of female terminal)
G/O
W/Bu
TEST HARNESS PIN BOX
5P (Black) CONNECTOR
(Wire side of female terminal)
W/Bu
W/Bu
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