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OPERATION
- ABS-ECU contains the power supply circuit (+ BV terminal) for the solenoid
valve. The solenoid valve is energised by the valve relay, which is incorporated in ABS-ECU.
- The valve relay, which is incorporated in ABS-ECU, is always energising the solenoid
valve unless the initial check is in progress when the ignition switch is turned on, and the recurrent
system check is in progress.
- ABS-ECU activates the solenoid valve by turning on its driving transistor.
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These diagnosis codes will be set under the cases below:
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- The solenoid valve is not energized even after ABS-ECU has turned on the
driving transistor (Open circuit is present in the power supply circuit to the ABS-ECU solenoid
valve, or the valve relay has failed).
- The solenoid valve is not energised even after ABS-ECU has turned on the driving
transistor (Open circuit is present in the solenoid valve circuit in ABS-ECU, or the valve relay has
failed).
- After ABS-ECU has turned off the driving transistor, the solenoid valve still remains
energized (short in the solenoid valve circuit).
- When a solenoid valve failure is detected
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).On
completion, go to Step 2.
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Q.
Is the relevant diagnosis code set?
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This diagnosis is complete.
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Erase the diagnosis code.
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Q.
Is the relevant diagnosis code set?
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Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ).
Then go to Step 4.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/ How
to Cope with Intermittent Malfunctions ).
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Erase the diagnosis code.
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Q.
Is the relevant diagnosis code set?
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This diagnosis is complete.
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