Code No.C1860:
Abnormality In Battery Voltage (High Voltage)
Code No.C1861: Abnormality In Battery
Voltage (Low Voltage)
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If there is any problem in
the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose
the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis  ).
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The TCL/ASC-ECU power supply energised by the ignition switch (IG1) is transmitted
to TCL/ASC-ECU (terminal No. 40) through the multi-purpose fuse No. 40.
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DIAGNOSIS CODE SET CONDITIONS
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Code No. C1860 will be set when the power supply voltage to TCL/ASC-ECU has decreased
to a specified value or higher. Code No. C1861 will be set when the power supply voltage to
the TCL/ASC-ECU has increased to a specified value or lower.
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Current trouble
- Damaged wiring harness and connectors
- Excessive electrical load
- Battery failure
- TCL/ASC-ECU malfunction
- Charging system failed
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Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or
wiring harness in the power supply circuit (terminal No.40) to the TCL/ASC-ECU. For
diagnosis procedures, refer to How to treat past trouble (GROUP 00 - How to Cope with
Intermittent Malfunction ).
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STEP 1. M.U.T.-III CAN bus diagnostics
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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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 Go to Step 3.
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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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STEP 2. Check whether the diagnosis code is reset.
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Q.
Is the diagnosis code No.C1860 or C1861 set?
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Go to Step 3.
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This diagnosis is complete.
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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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Go to Step 4.
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Replace the battery. Then go to Step 11.
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STEP 4. Charging system check
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Refer to GROUP 16 - Charging System .
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Q.
Is the charging system in good condition?
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Go to Step 5.
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Repair or replace the charging system component(s). Then go to Step 11.
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STEP 5. Connector check: A-06 TCL/ASC-ECU connector, B-210
junction block connector, B-229 junction block connector
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Q.
Is the check result normal?
Go to Step 6.
NO  : Repair the defective connector. Then go to Step 11.
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STEP 6. Fusible link check: Check the fuse No.40.
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Visually check for open circuit in the fusible link No.40.
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Resistance measurement at A-06 TCL/ASC-ECU connector
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(1)Disconnect the TCL/ASC-ECU connector, connect special tool ABS check harness
(MB991984) to the harness-side connector, and then measure the resistance at the special tool
connector side.
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Do not connect the special tool ABS check harness (MB991984) to TCL/ASC-ECU.
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(2)Disconnect the B-210 junction block connector.
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(3)Measure the resistance between the A-06 TCL/ASC-ECU connector terminal No.40
and the body earth.
OK: No continuity
Q.
Is the check result normal?
Replace the fuse No.40. Then go to Step 11.
The short circuit may be present in the power supply circuit. Repair the wiring
harness between the A-06 TCL/ASC-ECU connector terminal No.40 and B-210 junction block
connector terminal No.11, and then replace the fuse No.40. Then go to Step 11.
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STEP 8. Voltage measurement at the A-06 TCL/ASC-ECU connector
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(1)Disconnect the TCL/ASC-ECU connector, connect special tool ABS check harness
(MB991984) to the harness-side connector, and then measure the resistance at the special tool
connector side.
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Do not connect the special tool ABS check harness (MB991984) to TCL/ASC-ECU.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between the terminal No.40 and the body earth.
OK: System voltage
Q.
Is the check result normal?
Go to Step 9.
The open circuit may be present in the power supply circuit. Repair the wiring
harness between the A-06 TCL/ASC-ECU connector terminal No.40 and the fuse No.40. Then
go to Step 11.
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STEP 9. Resistance measurement at A-06 TCL/ASC-ECU connector
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(1)Disconnect the TCL/ASC-ECU connector, connect special tool ABS check harness
(MB991984) to the harness-side connector, and then measure the resistance at the special tool
connector side.
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Do not connect the special tool ABS check harness (MB991984) to TCL/ASC-ECU.
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(2)Measure the resistance between the terminal No.43 and the body earth, and between the
terminal No.46 and the body earth
OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 10.
An open circuit may be present in the earth circuit. Repair the wiring harness
between the A-06 TCL/ASC-ECU connector terminal No.43 and the body earth, and between
the A-06 TCL/ASC-ECU connector terminal No.46 and the body earth. Then go to Step 11
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STEP 10. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 6 km/h or more.
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Q.
Is the diagnosis code No.C1860 or C1861 set?
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Replace the hydraulic unit (integrated with TCL/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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STEP 11. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 6 km/h or more.
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Q.
Is the diagnosis code No.C1860 or C1861 set?
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Return to Step 1.
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This diagnosis is complete.
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