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The ASC-ECU is energized by the valve power supply circuit (terminal No.32).When the power
is supplied from the ignition switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay is turned
on. At this time, the valve power supply circuit (terminal No.32) energizes the ASC-ECU.
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This diagnosis code is set when the ASC-ECU power supply voltage drops below 9.7 ± 0.3
V during driving
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- Battery failure
- Battery terminal looseness
- Fusible link malfunction
- Charging system failed
- Damaged wiring harness and connectors
- ASC-ECU 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 diagnosis code No.C2100 set?
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This diagnosis is complete.
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Visually check for open circuit in fusible link No.27.
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Q.
Is the check result normal?
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Replace fusible link No.27. Then go to Step 11.
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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. Then go to Step 11.
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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). Then go to Step 11.
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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 terminal No.32 and 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 terminal No.16 and body earth, and between terminal No.47 and
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 terminal No.16 and body earth, and between the A-03 ASC-ECU terminal
No.47 and body earth.
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NO : Repair the defective connector.
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Q.
Is the diagnosis code No. C2100 set?
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Replace the ASC-ECU (Refer to ). Then go to
Step 11.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Q.
Is the diagnosis code No. C2100 set?
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This diagnosis is complete.
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