Honda CBR125R Owner's Manual page 130

FUEL SYSTEM (PGM-FI)
5. IAT Sensor Voltage Input Line Open Circuit
Inspection
Check for continuity at the Gray/blue wire
between the sensor unit 5P connector of the wire
side and ECM test harness.
Connection: 14 – Gray/blue
Is there continuity?
YES
NO
6. IAT Sensor Resistance Inspection
Turn the ignition switch OFF.
Connect the sensor unit 5P connector.
Measure the resistance at the ECM test harness
terminals (at 20°C/68°F).
Connection: 14 – 4
Standard:
Is the resistance within 1.13 – 1.88 k Ω (20 ° C/
68 ° F)?
YES
NO
MIL 12 BLINKS (INJECTOR)
• Before starting the inspection, check for loose or
poor contact on the injector 2P connector and
recheck the MIL blinking.
1. Injector Input Voltage Inspection
Turn the ignition switch OFF.
Disconnect the injector 2P connector.
Turn the ignition switch ON (and engine stop
switch " ": CM and U type).
Measure the voltage between the injector 2P
connector of the wire side and ground.
Connection: Black/white (+) – Ground (–)
Standard:
Does the standard voltage exist?
YES
NO
5-38
– GO TO STEP 6.
– Open circuit in Gray/blue wire
1.13 – 1.88 kΩ (20°C/68°F)
– Replace the ECM with a known good
one, and recheck.
– Faulty sensor unit (IAT sensor)
Battery voltage
– GO TO STEP 2.
– Open or short circuit in Black/white wire
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminal)
Gr/Bu
(14)
(14) (4)
INJECTOR 2P CONNECTOR
(Wire side/female terminal)
Bl/W