Honda CBR650F Service Manual page 109

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PGM-FI SYSTEM
DTC 9-2 (IAT SENSOR HIGH VOLTAGE)
• Before starting the inspection, check for loose or
poor contact on the IAT sensor 2P (Black), ECM 33P
(Black) and 33P (Gray) connectors, and recheck the
DTC.
1. IAT Sensor System Inspection
Check the IAT sensor with the MCS.
Is about 5 V indicated?
YES
NO
2. IAT Sensor System Inspection with Jumper Wire
Turn the ignition switch OFF.
Disconnect the IAT sensor 2P (Black) connector
(page 4-38).
Connect the wire harness side IAT sensor 2P
(Black) connector [1] terminals with a jumper wire
[2].
CONNECTION: Gray/blue – Green/yellow
Check the IAT sensor with the MCS.
Is about 0 V indicated?
YES
NO
3. IAT Sensor Line Open Circuit Inspection
Turn the ignition switch OFF.
Disconnect the ECM 33P (Black) and 33P (Gray)
connectors (page 4-35).
Check for continuity between the wire harness side
IAT sensor 2P (Black) connector [1] and ECM 33P
(Black) [2]/33P (Gray) [3] connector terminals.
TOOL:
Test probe
CONNECTION:
Gray/blue – Gray/blue
Green/yellow – Green/yellow
Is there continuity?
YES
NO
4. IAT Sensor Resistance Inspection
Connect the IAT sensor 2P (Black) connector.
Measure the resistance between the wire harness
side ECM 33P (Black) [1] and 33P (Gray) [2]
connector terminals.
TOOL:
Test probe
CONNECTION: Gray/blue – Green/yellow
STANDARD: 1 – 4 kΩ (20°C/68°F)
Is the resistance within standard value?
YES
NO
4-20
– GO TO STEP 2.
– Intermittent failure
– Faulty IAT sensor
– GO TO STEP 3.
07ZAJ-RDJA110
– GO TO STEP 4.
– • Open circuit in Gray/blue wire
• Open circuit in Green/yellow wire
07ZAJ-RDJA110
– Replace the ECM with a known good one,
and recheck.
– Faulty IAT sensor
[1]
Gr/Bu
[3]
Gr/Bu
Gr/Bu
[2]
Gr/Bu
G/Y
[2]
[2]
G/Y
G/Y
[1]
[1]
G/Y