Honda CBR125R Owner's Manual page 122

FUEL SYSTEM (PGM-FI)
DTC 54-1 (BANK ANGLE SENSOR LOW
VOLTAGE)
1. Recheck DTC
Clear the DTC's (page 5-12).
Turn the ignition switch ON (and engine stop
switch " ": CM and U type).
Check the bank angle sensor with the HDS
pocket tester.
Is the DTC 54-1 indicated?
YES
NO
2. Bank Angle
Inspection
Turn the ignition switch OFF.
Disconnect the bank angle sensor 3P connector.
Turn the ignition switch ON (and engine stop
switch " ": CM and U type).
Measure the voltage at the bank angle sensor
connector of the wire side.
Connection: White/red (+) – Green/orange (–)
Standard:
Is the voltage within 4.75 – 5.25 V?
YES
NO
3. Bank Angle Sensor Input Voltage Line Short
Circuit Inspection
Turn the ignition switch OFF.
Check the continuity between the bank angle
sensor 3P connector of the wire side and
ground.
Connection: White/red – Ground
Is there continuity?
YES
NO
5-30
– GO TO STEP 2.
– • Intermittent failure
• Loose or poor contact on the bank
angle sensor 3P connector
Sensor Power Input
4.75 – 5.25 V
– GO TO STEP 4.
– GO TO STEP 3.
– Short circuit in White/red wire
– Replace the ECM with a known good
one, and recheck.
Voltage
BANK ANGLE SENSOR 3P CONNECTOR
(Wire side/female terminals)
W/R
BANK ANGLE SENSOR 3P CONNECTOR
(Wire side/female terminal)
W/R
G/O