Code No.U1007 Security alarm sensor LIN timeout <Vehicles with security alarm sensor>
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Before replacing the ECU, ensure that the communication circuit is normal.
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JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1007 when no signals are received from the security alarm sensor.
PROBABLE CAUSES
- Faulty security alarm sensor
- Malfunction of the LIN bus
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STEP 1. Resistance measurement at the security alarm sensor connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the security alarm sensor connector (earth terminal) and the body earth. OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 3.
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Go to Step 2.
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STEP 2. Check of open circuit in body earth line between security alarm sensor connector (earth terminal) and the body earth.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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STEP 3. Voltage measurement at the security alarm sensor 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 security alarm sensor connector (LIN2 terminal) and the body earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check of short to power supply, short to earth, and open circuit in LIN2 line between ETACS-ECU connector and security alarm sensor connector.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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STEP 5. Check of open circuit in BUP1 line between ETACS-ECU connector and security alarm sensor connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness.
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STEP 6. Check whether the diagnosis code is stored again.
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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 the LOCK (OFF) position to the ON position.
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(3)Check if diagnosis code is stored.
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Q.
Is the diagnosis code stored?
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Replace the security alarm sensor.
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A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the security alarm sensor and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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