Honda CBR650F Service Manual page 108

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DTC 9 (IAT SENSOR)
Probable cause
• Open or short circuit in Gray/blue wire between the
IAT sensor and ECM
• Open circuit in Green/yellow wire between the IAT
sensor and ECM
• Faulty IAT sensor
• Faulty ECM
DTC 9-1 (IAT SENSOR LOW VOLTAGE)
1. IAT Sensor System Inspection
Check the IAT sensor with the MCS.
Is about 0 V indicated?
YES
NO
2. IAT Sensor System Inspection with Connector
Disconnected
Turn the ignition switch OFF.
Disconnect the IAT sensor 2P (Black) connector
(page 4-38).
Check the IAT sensor with the MCS.
Is about 0 V indicated?
YES
NO
3. IAT Sensor Output Line Short Circuit Inspection
Turn the ignition switch OFF.
Disconnect the ECM 33P (Gray) connector (page 4-
35).
Check for continuity between the wire harness side
IAT sensor 2P (Black) connector [1] terminal and
ground.
CONNECTION: Gray/blue – Ground
Is there continuity?
YES
NO
IAT SENSOR
– GO TO STEP 2.
– Intermittent failure
– GO TO STEP 3.
– Faulty IAT sensor
– Short circuit in Gray/blue wire
– Replace the ECM with a known good one,
and recheck.
ECM
5 V
Gr/Bu
G/Y
PGM-FI SYSTEM
[1]
Gr/Bu
4-19