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- The ABS-ECU power supply signal energized by the ignition
switch (IG1) is transmitted to ABS-ECU (terminal No.7) via the multi-purpose fuse No.12.
- The ABS-ECU power supply and the valve power supply are transmitted to ABS-ECU (terminal
No.26) via the fusible link No.27.
- The ABS-ECU power supply and the motor power supply are transmitted to ABS-ECU (terminal
No.13) via the fusible link No.26.
- When malfunction occurs in ABS-ECU power supply, the communication with M.U.T.-III
becomes unavailable.
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- Damaged wiring harness and connectors
- Blown fuse
- Battery failure
- Charging system failed
- ABS-ECU malfunction
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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)Turn the ignition switch to the ON position. (3)Measure the voltage between terminal No.7 and body earth. OK: Approximately battery voltage
Q.
Is the check result normal?
Go to Step 4.
Go to Step 10.
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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.26 and the body earth. OK: Approximately battery voltage
Q.
Is the check result normal?
Go to Step 7.
Go to Step 5.
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Q.
Is the check result normal?
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Replace the fusible link No.27.
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Q.
Is the check result normal?
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Repair the wiring harness between the fusible link No.27 and the A-02 ABS-ECU
connector terminal No.26.
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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 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)Voltage between the terminal No.13 and the body earth OK: Approximately battery voltage
Q.
Is the check result normal?
Go to Step 19.
Go to Step 8.
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Q.
Is the check result normal?
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Replace the fusible link No.26.
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Q.
Is the check result normal?
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Repair the wiring harness between the fusible link No.26 and the A-02 ABS-ECU
connector terminal No.13.
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Repair the defective connector.
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Q.
Is the check result normal?
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Replace the abnormal fuse or fusible link.
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Q.
Is the check result normal?
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Repair the defective connector.
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(1)Disconnect the ETACS-ECU connector, and then measure the voltage at the harness
connector side.
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(2)Voltage between the terminal No.1 and the body earth OK: Approximately battery voltage
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Q.
Is the check result normal?
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Repair the wiring harness between the fusible link No.33 and the C-309 ETACS-ECU
connector terminal No.1.
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Q.
Is the check result normal?
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Repair the defective connector.
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(1)Disconnect the ETACS-ECU connector, and then measure the voltage at the ETACS-ECU
side.
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(2)Turn the ignition switch to the ON position.
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(3)Voltage between the terminal No.6 and the body earth OK: Approximately battery voltage
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Q.
Is the check result normal?
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Q.
Is the check result normal?
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Repair the wiring harness between the C-210 ignition switch connector terminal
No.2 and the C-317 ETACS-ECU connector terminal No.6.
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(1)Do not disconnect the ETACS-ECU connector, and then measure the voltage for back
probing.
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(2)Turn the ignition switch to the ON position.
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(3)Voltage between the terminal No.5 and the body earth OK: Approximately battery voltage
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Q.
Is the check result normal?
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Replace ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
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Q.
Is the check result normal?
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Repair the defective connector.
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- Check for open or short circuit.
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Q.
Is the check result normal?
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Repair the wiring harness.
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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 20.
Repair the wiring harness.
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Q.
Is the communication with M.U.T.-III possible?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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Make sure that the M.U.T.-III cable is properly connected and the V.C.I. switch
is ON, and then replace ABS-ECU (Refer to ).
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