Code No. U1920:
K-line error (MCU)
ELECTRIC MOTOR UNIT CONTROL SYSTEM CIRCUIT
DIAGNOSIS CODE SET CONDITIONS
If the K-LINE data from the EV-ECU cannot be received for 0.5 seconds or longer, the MCU
will set the diagnosis code No. U1920.
PROBABLE CAUSES
- Malfunction of the K-LINE
- Malfunction of the EV-ECU
- Malfunction of the MCU
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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 line. (Refer to GROUP 54C - Troubleshooting  .)
Then go to Step 2.
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STEP 2. Diagnosis code recheck
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Check again if the diagnosis code No. U1920 is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor 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 code set?
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Go to Step 3.
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The diagnosis is complete.
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STEP 3. Connector check: C-110 EV-ECU connector, E-06 MCU connector
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the damaged connector.
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STEP 4. Check the wiring harness between C-110 EV-ECU connector terminal
No. 76 and E-06 MCU connector terminal No. 9.
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- Check the K-LINE for short circuit.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the wiring harness.
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STEP 5. Measure the voltage at E-06 MCU connector.
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(1)Disconnect the connector and measure at the wiring harness side.
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(2)Measure the voltage between the E-06 MCU connector No.9 and the body earth.
OK: 5 V or more
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the EV-ECU. (Refer to .) Then go
to Step 8.
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STEP 6. Voltage measurement at C-110 EV-ECU connector
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(1)Disconnect the connector and measure at the wiring harness side.
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(2)Measure the voltage between the C-110 EV-ECU connector terminal No. 76 and the
body earth.
OK: 5 V or more
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Q.
Is the check result normal?
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Go to Step 7.
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Replace the MCU. (Refer to .) Then go to Step 8.
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STEP 7. Diagnosis code recheck
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Check again if the diagnosis code is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor 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 any diagnosis code set?
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Go to Step 1.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction .)
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STEP 8. Diagnosis code recheck
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Check again if the diagnosis code is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor 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 any diagnosis code set?
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Go to Step 1.
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The diagnosis is complete.
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