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- ASC-ECU contains the power supply circuit (terminal No.32) for the solenoid
valve. The solenoid valve is energised by the valve relay, which is incorporated in ASC-ECU.
- The valve relay, which is incorporated in ASC-ECU, is always energising the solenoid
valve unless the initial check is in progress when the ignition switch is turned on, or the recurrent
system check is in progress.
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This diagnosis codes will be set when the solenoid valve supply voltage is not within
the standard value.
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Current trouble
- Fusible link malfunction
- Damaged wiring harness and connectors
- Abnormality in battery or alternator
- ASC-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 (terminal No.32) to ASC-ECU solenoid valve
or earth circuit (terminal No.16 and 47). 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. C2104 set?
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This diagnosis is complete.
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Visually check for open circuit in the fusible link No.27.
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Q.
Is the check result normal?
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Replace the fusible link No.27.
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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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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 ASC-ECU connector, connect special tool ASC check harness (MB991997) to
the harness-side connector, and then measure the voltage at the special tool connector side.
note |
Do not connect the special tool ASC check harness (MB991997) to ASC-ECU.
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(2)Turn the ignition switch to the ON position. (3)Measure the voltage between the terminal No.32 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 power supply circuit. Repair the
wiring harness between the A-03 ASC-ECU connector terminal No.32 and the fusible link No.27.
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NO : Repair the defective connector.
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(1)Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to
the harness-side connector, and then measure the resistance at the special tool connector side.
note |
Do not connect the special tool ASC check harness (MB991997) to ASC-ECU.
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(2)Resistance between the terminal No.16 and the body earth, and between the terminal
No.47 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-03 ASC-ECU connector terminal No.16 and the body earth, and between the A-03 ASC-ECU
connector terminal No.47 and the body earth.
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NO : Repair the defective connector.
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Q.
Is the diagnosis code No. C2104 set?
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Replace the ASC-ECU (Refer to ). Then go to
Step 11.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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Q.
Is diagnosis code No.C2104 set?
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This diagnosis is complete.
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