Honda CBR125R, Owner'S Manual

Page: 380 / 430

ELECTRIC STARTER
18-4
TROUBLESHOOTING
Starter motor does not turn
1. Fuse Inspection
Check for blown main fuse or sub fuse.
Is the fuse blown?
YES – Replace the fuse.
NO – GO TO STEP 2.
2. Battery Inspection
Make sure the battery is fully charged and in good condition (page 16-5).
Is the battery in good condition?
YES – GO TO STEP 3.
NO – Charge or replace the battery.
3. Starter Relay Switch Operation
Check the starter relay switch operation.
You should hear the relay "CLICK" when the starter switch button is depressed.
Is there a "CLICK"?
YES – GO TO STEP 4.
NO – GO TO STEP 5.
4. Starter Motor Inspection
Apply battery voltage directly to the starter motor and check the operation.
Does the starter motor turn?
YES – • Poorly contacted starter motor cable
• Faulty starter relay switch (page 18-15)
NO – Faulty starter motor (page 18-6)
5. Relay Coil Ground Lines Inspection
Disconnect the starter relay switch connector, and check the relay coil ground wire line as below for
continuity:
1. Green/red terminal – diode – neutral switch line (with the transmission in neutral and clutch lever
released).
2. Green/red terminal – clutch switch – sidestand switch line (in any gear except neutral, and with
the clutch lever pulled in and sidestand up.
Is there continuity?
NO – • Loose or poor contact connector
• Open circuit in wire harness
• Faulty starter switch (page 19-14)
• Faulty sidestand switch (page 19-19)
• Faulty diode (page 18-15)
• Faulty clutch switch (page 19-20)
• Faulty neutral switch (page 19-17)
YES – GO TO STEP 6.
6. Starter Relay Input Voltage Inspection
Connect the starter relay switch connector.
With the ignition switch ON (and engine stop switch " ": CM and U type), measure the voltage at the
starter relay switch connector (between Yellow/red (+) and ground (–)).
Does the battery voltage exist?
NO – • Faulty ignition switch (page 19-13)
• Faulty starter switch (page 19-14)
• Engine stop switch (CM and U type) (page 19-14)
• Loose or poor contact connector
• Open circuit in wire harness
YES – GO TO STEP 7.