Code No.21 Height Sensor Abnormality (Rear)


caution Before replacing the ECU, ensure that the communication circuit is normal.








TROUBLE JUDGEMENT



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the rear height sensor
  • Malfunction of the headlamp automatic levelling-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Connector check: F-02 rear height sensor connector


Q. Is the check result normal?





STEP 2. Rear height sensor check



Q. Is the check result normal?





STEP 3. Connector check: C-14 headlamp automatic levelling-ECU connector


Q. Is the check result normal?





STEP 4. Wiring harness check between the F-02 rear height sensor connector terminal No. 1/2/3 and the C-14 headlamp automatic levelling-ECU connector terminal No. 16/18/20.


note Before the wiring harness check, check the intermediate connectors C-31, D-12 and F-03, and then repair that if necessary.

  • Check the power supply lines, earth lines and communication lines for open or short circuit.

Q. Is the check result normal?





STEP 5. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.21 set?