Code No. P1723: Abnormality in Speed Sensor System Function

DIAGNOSTIC FUNCTION

CVT-ECU detects the abnormal wave pattern of the speed sensor signal.

JUDGEMENT 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:

CVT-ECU connector
Primary pulley speed sensor connector
Secondary pulley speed sensor connector
Intermediate 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.