Code No. C1860:
High voltage at ABS-ECU power supply
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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 - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
The ABS-ECU is energised by the ignition switch through the multi-purpose fuse at the
terminal IG1.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the power supply voltage of the ABS-ECU is abnormally
high.
PROBABLE CAUSES
- Overcurrent
- Battery abnormality
- Charging system failed
- Malfunction of the hydraulic unit assembly (integrated with ABS-ECU)
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the 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. Diagnosis code recheck after resetting CAN bus lines
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. C1860 set?
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Go to Step 3.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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STEP 3. Check the battery
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Refer to GROUP 54A - Battery Test .
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Q.
Is the check result normal?
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Go to Step 4.
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Charge or replace the battery (Refer to GROUP 54A - Battery ).
Then go to Step 6.
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STEP 4. Check the charging system
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Refer to GROUP 16 - Charging System .
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Q.
Is the check result normal?
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Go to Step 5.
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Repair or replace the charging system component(s) (Refer to GROUP 16 - Alternator ).
Then go to Step 6.
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STEP 5. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. C1860 set?
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Replace the hydraulic unit assembly (integrated with ABS-ECU) (Refer to ).
Then go to Step 6.
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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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STEP 6. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. C1860 set?
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Return to Step 1.
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The procedure is complete.
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