Code No.C1564
Vehicle speed data invalid
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caution |
- 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
).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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EPS-ECU receives vehicle speed signal from the engine-ECU.
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The vehicle speed signal is sent to the EPS-ECU for
motor control.
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Check Conditions
- The power supply circuit system diagnosis code (No. C1540, C1541) is not set.
- The engine circuit system diagnosis code is not set.
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Judgement Criterion
If the microcomputer receives abnormal vehicle speed signal from the engine-ECU,
it determines that the vehicle speed calculation system is defective.
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Fail Safe, Back Up Function
The EPS-ECU illuminates the electric power steering warning display, and sets the
diagnosis code No. C1564 to limit assist operation.
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- Malfunction of CAN bus line
- Malfunction of the EPS-ECU
- Malfunction of the engine-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 "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis codes C1564 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. M.U.T.-III data list
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Check the following service data .
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- Item No. 08: Vehicle speed
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Q.
Is the check result normal?
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Go to Step 5.
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Perform troubleshooting for engine-ECU (Refer to GROUP 13A - Troubleshooting <4B1>
or GROUP 13B - Troubleshooting <6B3>). Then go
to Step 4.
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STEP 4. Check whether the diagnosis code is reset
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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 the diagnosis codes C1564 set?
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Replace the EPS-ECU (Refer to ). Then go to Step
5.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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STEP 5. Check whether the diagnosis code is reset.
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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 the diagnosis codes C1564 set?
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Return to Step 1.
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This diagnosis is complete.
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