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Fault Code Nos.
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Fault Code No.: 42-3 Diagnostic Code No.: 21
Item: Clutch switch: open or short circuit is detected.
Fail-Safe System: Able to start engine | Able to Drive Vehicle
Indicated: Neutral
• "ON" (when the transmission is in neutral)
• "OFF" (when the transmission is in gear or the clutch lever released)
• "ON" (when the transmission is in neutral)
• "OFF" (when the transmission is in gear or the clutch lever released)
Procedure: Operate the transmission, clutch lever, and sidestand.
Probable Cause of Confirmation of Service
Item Malfunction and Check Maintenance Job Completion
Item Malfunction and Check Maintenance Job Completion
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1
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Locate the malfunction.
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Execute the diagnostic
mode. (Code No. 07). Rotate the rear wheel by hand and check that the indicated value increases. Execute the diagnostic mode. (Code No. 21). When the transmission is in neutral: "ON". When the transmission is in gear with the clutch lever released: "OFF". When the transmission is in gear with the clutch lever squeezed and the sidestand retracted: "ON" |
If the value does not increase, then go to item 2 in Fault Code No. 42-1, for the speed sensor.
If it is an Incorrect indication, go to item 2 in Fault Code No. 42-2 for the neutral switch. If it is an Incorrect indication, go to item 2. |
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2
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Clutch lever adjustment.
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Adjust the Clutch Lever Free Play.
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Execute the diagnostic
mode. (Code No. 21). When the transmission is in gear with the clutch lever is released and the sidestand retracted: "OFF" When the clutch lever is squeezed: "ON" If it is a correct indication, then go to item 9. If however, it is a incorrect indication, then go to item 3. |
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3
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Connection of clutch switch
coupler. Check the locking condition of the coupler. Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the pins). |
Improperly connected.
Connect the coupler securely or replace the wire harness. |
Execute the diagnostic
mode. (Code No. 21). When the transmission is in gear with the clutch lever is released and the sidestand retracted: "OFF" When the clutch lever is squeezed: "ON" If it is a correct indication, then go to item 9. If however, it is a incorrect indication, then go to item 4. |
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4
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Connection of ECU coupler.
Check the locking condition of the coupler. Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the pins). |
Improperly connected.
Connect the coupler securely or replace the wire harness. |
Execute the diagnostic
mode. (Code No. 21). When the transmission is in gear with the clutch lever is released and the sidestand retracted: "OFF" When the clutch lever is squeezed: "ON" If it is a correct indication, then go to item 9. If however, it is a incorrect indication, then go to item 5. |
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5
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Wire harness continuity.
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Open or short circuit.
Replace the wire harness. Between clutch switch coupler and relay unit coupler. (Black/Yellow-Black/Yellow) (Blue/Yellow-Blue/Yellow) Between relay unit coupler and ECU coupler. (Black/Yellow-Black/Yellow) |
Execute the diagnostic
mode. (Code No. 21). When the transmission is in gear with the clutch lever is released and the sidestand retracted: "OFF" When the clutch lever is squeezed: "ON" If it is a correct indication, then go to item 9. If however, it is a incorrect indication, then go to item 6. |
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6
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Wire harness continuity.
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Between clutch switch coupler and relay unit coupler.
(Blue/Yellow-Black/Yellow) When the clutch lever is released: open circuit When the clutch lever is squeezed: short circuit Open or short circuit. Replace the clutch switch. |
Execute the diagnostic
mode. (Code No. 21). When the transmission is in gear with the clutch lever is released and the sidestand retracted: "OFF" When the clutch lever is squeezed: "ON" If it is a correct indication, then go to item 9. If however, it is a incorrect indication, then go to item 7. |
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7
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Defective clutch switch.
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Check the clutch switch.
Replace if defective. |
Execute the diagnostic
mode. (Code No. 21). When the transmission is in gear with the clutch lever is released and the sidestand retracted: "OFF" When the clutch lever is squeezed: "ON" If it is a correct indication, then go to item 9. If however, it is a incorrect indication, then go to item 8. |
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8
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Malfunction in ECU.
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Replace the ECU.
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9
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Delete the fault code.
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Turn the main switch to "ON" and then rotate the rear wheel by hand.
Start the engine, and input the vehicle speed signals by operating the vehicle at 20 to 30km/h (19mph). Check that the fault code number is not displayed. |
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