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- ABS-ECU contains the power supply circuit (terminal No.13) for the pump motor.
The pump motor is energised by the motor switch, which is incorporated in ABS-ECU.
- The pump motor switch, which is incorporated in ABS-ECU, is always off unless the
motor solenoid valve check is activated when the vehicle is started.
- ABS-ECU activates the pump motor by turning on the ECU built-in pump motor switch.
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This diagnosis codes will be set under the cases below:
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- When the power supply voltage of the pump motor, which is not in operation,
is abnormally low for a prolonged period
- When the power supply voltage of the pump motor, which is not in operation, is abnormally
high for a prolonged period
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Current trouble
- Fusible link malfunction
- Damaged wiring harness and connectors
- Abnormality in battery or alternator
- ABS-ECU malfunction
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Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between the power supply circuit (A-02 ABS-ECU connector terminal No.13)
to the ABS-ECU motor and the earth circuit (A-02 ABS-ECU connector terminal No.1). For diagnosis
procedures, refer to How to treat past trouble (GROUP 00 - How to Cope with Intermittent
Malfunction
).
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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 Diagnosis table ).
On completion, go to Step 2.
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Q.
Is the diagnosis code No. C2116 set?
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This diagnosis is complete.
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Q.
Is the check result normal?
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Replace the fusible link No.26.
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Refer to GROUP 54A - Battery Test .
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Q.
Is the battery in good condition?
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Charge or replace the battery.
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Refer to GROUP 16 - Charging System (2000), (2200), (2400)
or (3000).
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Q.
Is the charging system in good condition?
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Repair or replace the charging system component(s).
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(1)Disconnect the ABS-ECU connector, connect special tool ABS check harness (MB991974) to
the harness-side connector, and then measure the voltage at the special tool connector side.
note |
Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
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(2)Measure the voltage between the terminal No.13 and the body earth. OK: Approximately battery voltage
Q.
Is the check result normal?
Go to Step 8.
Go to Step 7.
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Q.
Is the check result normal?
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The open or short circuit may be present in the solenoid valve power supply circuit.
Repair the wiring harness between the A-02 ABS-ECU connector terminal No.13 and the fusible
link No.26.
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NO : Repair the defective connector.
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(1)Disconnect the ABS-ECU connector, connect special tool ABS check harness (MB991974) to
the harness-side connector, and then measure the resistance at the special tool connector side.
note |
Do not connect the special tool ABS check harness (MB991974) to ABS-ECU.
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(2)Resistance between the terminal No.1 and the body earth, and between the terminal
No.14 and the body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 10.
Go to Step 9.
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Q.
Is the check result normal?
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An open circuit may be present in the earth circuit. Repair the wiring harness
between the A-02 ABS-ECU terminal No.1 and the body earth, and between the A-02 ABS-ECU terminal
No.14 and the body earth.
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NO : Repair the defective connector.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or more.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h
or higher.
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Q.
Is the diagnosis code No. C2116 set?
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Replace the ABS-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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