Code No.C1565 Engine revolution data invalid
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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 ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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EPS-ECU receives engine revolution signal from the engine-ECU.
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The engine 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 engine speed signal from the engine-ECU, it determines that the engine speed calculation system is defective.
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Fail Safe, Back Up Function
The EPS-ECU illuminates the electric power steering warning symbol, and sets diagnosis code No.C1565. Normally the assist operation continues while the vehicle is driven, but deactivated after the vehicle is stopped.
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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 diagnosis code C1565 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. 07: Engine 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 -
Diagnosis code chart <4B1>, Refer to GROUP 13B -
Diagnosis code chart <6B3>
or Refer to GROUP 13D -
Diagnosis code chart <4N1>). Then go to Step 4.
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STEP 4. 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 C1565 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 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 C1565 set?
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Return to Step 1.
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This diagnosis is complete.
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