Code No.U1519 No bus activity for LIN(Theft) <Vehicles with security alarm sensor>
caution |
- Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID .)
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TROUBLE JUDGEMENT
The ETACS-ECU will store diagnosis code No. U1519 when no communication has been carried out for more than a certain period after it received last valid data.
PROBABLE CAUSES
- Malfunction of the ETACS-ECU
- Malfunction of the slave ECU
- LIN-TAS bus lines shorted to power supply
- LIN-TAS bus lines shorted to earth
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STEP 1. Measure the voltage at the LIN-TAS bus lines.
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Check the LIN-TAS bus line for short to power supply.
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(1)Disconnect all the connector leading to the LIN-TAS bus lines.
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(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(3)Measure the voltage between the security alarm siren connector (power supply terminal) and the body earth.
- The voltmeter needle does not swing.
note |
If the LIN-TAS bus line are short to power supply, the voltmeter indicates a constant value.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the connector(s) or wiring harness.
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STEP 2. Measure the resistance at the LIN-TAS bus lines.
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Check the LIN-TAS bus line for short to earth.
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(1)Disconnect all the connector leading to the LIN-TAS bus lines.
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(2)Measure the resistance between the security alarm siren connector (earth terminal) and the body earth.
- No continuity (1 kΩ or more)
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the connector(s) or wiring harness.
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STEP 3. Check the security alarm siren.
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Disconnect security alarm siren connector, and recheck whether diagnosis code No. U1515 is stored.
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(1)Connect all the relevant ECUs, and disconnect lighting control sensor connector only.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(4)Check whether diagnosis code No. U1515 is stored.
note |
If diagnosis code No. U1515 is not stored, diagnosis code No. U1006 is stored because the security alarm siren is disconnected. This is normal.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1515 stored?
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Reconnect the security alarm siren connector, and go to Step 4.
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Replace the security alarm siren.
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STEP 4. Recheck for diagnosis code.
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Check again if the diagnosis code is stored in the ETACS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(3)Check whether diagnosis code No. U1515 is stored.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the diagnosis code stored?
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Replace the ETACS-ECU.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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