Code No.C1860: Power supply high 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, 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
Power is supplied to the EPS-ECU from the battery or the ignition switch.
DIAGNOSIS CODE SET CONDITION
The power supply voltage is more than a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the power supply system.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Defective battery
- Charging system failed
- Malfunction of the EPS-ECU
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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 Diagnostics 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)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the" O"N position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1860 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check the battery voltage.
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Start the engine and measure the battery voltage (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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Check the battery and repair if necessary (Refer to GROUP 54A - Battery Test , GROUP 54A - Battery Removal and Installation ). Then go to Step 7.
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STEP 4. Check the charging system.
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Start the engine and measure the charging system (Refer to GROUP 16 - On-vehicle Service/Alternator Output Line Voltage Drop Test ).
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Q.
Is the check result normal?
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Go to Step 5.
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Check the charging system and repair if necessary (Refer to GROUP 16 - Alternator Assembly ). Then go to Step 7.
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STEP 5. M.U.T.-III data list
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Check the following data list .
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- Item No. 22: Power relay voltage
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- Item No. 23: Ignition voltage
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check whether the diagnosis code is set again.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1860 set?
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Replace the EPS-ECU (Refer to ). Then go to Step 7.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).
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STEP 7. Check whether the diagnosis code is set again.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1860 set?
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Return to Step 1.
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This diagnosis is complete.
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