Code No.C1520 Motor turning angle (input)
Code No.C1521 Motor turning angle (output)
Code No.C1522 Motor turning angle range
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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.
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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- Power is supplied to the resolver from the electric power steering-ECU.
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- To output the voltage based on the motor rotation angle to the electric power steering-ECU, the voltage is supplied to the resolver.
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Check Conditions
- The power supply circuit system diagnosis code (No. C1540, C1541) is not set.
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Judgement Criterion
- The resolver input voltage is more than 3.2 V or less than 0.4 V.
- The resolver output voltage is more than 3.0 V or less than 2.0 V.
- The resolver input voltage or the resolver output voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the resolver system.
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Fail Safe, Back Up Function
- The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the diagnosis code Nos. C1520, C1521, and C1522.
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- Malfunction of CAN bus line
- Defective resolver of the steering gear and linkage assembly
- Defective harness wire(s) or connector(s)
- Short or open circuit between the electric power steering-ECU and the resolver or loose connector contact
- Malfunction of the electric power steering-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 - Troubleshooting ). 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 C1520, C1521 or C1522 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 following connector.
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Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
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- C-114-1 electric power steering-ECU connector
- Resolver intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only)
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Q.
Is the connectors and terminals in good condition?
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Go to Step 4.
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Replace the steering gear and linkage assembly (Refer to ). Then go to Step 8.
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STEP 4. Wiring harness check
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(1)Check the wiring harness between the C-114-1 electric power steering-ECU connector terminals No.21,No.22,No.23,No.25,No.27 or No.28 and the resolver for damage or other problem .
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(2)Check the wiring harness between the C-113 electric power steering-ECU connector terminal No.12 and the body earth point No.18 for damage or other problem .
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Q.
Is the wiring harness in good condition?
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Go to Step 5.
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Replace the steering gear and linkage assembly (Refer to ). Then go to Step 8.
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STEP 5. M.U.T.-III data list
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Check the following service data .
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- Item No. 04: Motor current
- Item No. 05: Motor current (target)
- Item No. 17: Motor electric angle
- Item No. 18: Motor speed
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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 6.
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STEP 6. 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 C1520,C1521 or C1522 set?
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Replace the electric power steering-ECU (Refer to ).Then go to Step 8.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).Then go to Step 7.
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STEP 7. 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 C1520,C1521 or C1522 set?
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Replace the steering gear and linkage assembly (Refer to ).Then go to Step 8.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 8. 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 C1520,C1521 or C1522 set?
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Return to Step 1.
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This diagnosis is complete.
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