Code No. P1723: Abnormality in Speed Sensor System Function
















DIAGNOSTIC FUNCTION



JUDGMENT CRITERIA



  • Rotational fluctuation of primary pulley is large (for 1 second).
  • Rotational fluctuation of secondary pulley is large (for 1 second).

PROBABLE CAUSES



  • Malfunction of primary pulley speed sensor
  • Malfunction of secondary pulley speed sensor
  • Malfunction of CVT-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Check the following connector:

  • C-135 CVT-ECU connector
  • B-118 Primary pulley speed sensor connector
  • B-120 Secondary pulley speed sensor connector
Check for the connection with terminals.

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Use an oscilloscope to measure the wave patterns of the primary pulley speed sensor and secondary pulley speed sensor.
Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the primary pulley speed sensor or secondary pulley speed sensor.

STEP 3. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?
Intermittent malfunction
Replace CVT-ECU.