Code No.U1504 RLS LIN Timeout


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.












TROUBLE JUDGMENT



COMMENTS ON TROUBLE SYMPTOM



note Diagnosis code No.U1504 will be stored in the CAN converter-ECU when the ignition switch is turned to the ON position with the power supply fuse (IOD fuse) removed. Therefore, diagnosis code No.U1504 may be stored as a past trouble even when the vehicle is normal. However, it is not a malfunction.

PROBABLE CAUSES



  • Malfunction of lighting control sensor
  • Malfunction of the CAN converter-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code



Q. Is diagnosis code No. U1570 set?





STEP 2. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?





STEP 3. M.U.T.-III other system diagnosis code



Q. Is the diagnosis code set?





STEP 4. Connector check: E-136 Lighting control sensor connector


Q. Is the check result normal?





STEP 5. Resistance measurement at the E-136 lighting control sensor connector


(1)Disconnect the lighting control sensor connector, and measure at the wiring harness side.
(2)Measure the resistance between E-136 lighting control sensor connector terminal No.2 and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 6. Check the wiring harness between E-136 lighting control sensor connector terminal No.2 and body earth.



  • Check the earth wires for open circuit.

Q. Is the check result normal?





STEP 7. Voltage measurement at the E-136 lighting control sensor connector.


(1)Disconnect the lighting control sensor connector, and measure at the wiring harness side.
(2)Measure the voltage between E-136 lighting control sensor connector terminal No. 1 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 8. Check the wiring harness between E-136 lighting control sensor connector terminal No. 1 and fusible link (1).


note Prior to the wiring harness inspection, check intermediate connector D-241, D-130 and joint connector D-34, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 9. Connector check: D-252 CAN converter-ECU connector


Q. Is the check result normal?





STEP 10. Voltage measurement at the E-136 lighting control sensor connector.


(1)Disconnect the lighting control sensor connector, and measure at the wiring harness side.
(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(3)Measure the voltage between E-136 lighting control sensor connector terminal No. 3 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 11. Check the wiring harness wires between D-252 CAN converter-ECU terminal No.12 and E-136 lighting control sensor connector terminal No.3.


note Prior to the wiring harness inspection, check intermediate connector D-130, and repair if necessary.

  • Check the communication lines for open circuit.

Q. Is the check result normal?





STEP 12. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?