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Home >> Mitsubishi >> 2017 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Continuously Variable Transaxle (CVT) Diagnosis & On-Vehicle Service - With Diagnostics - Lancer) >> Diagnosis >> Diagnostic Trouble Code Procedures >> DTC P1723: Abnormality in Speed Sensor System Function >> Probable Causes >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Check the following connector: 
    • C-40 TCM connector
    • B-07 Primary pulley speed sensor connector
    • B-113 Secondary pulley speed sensor connector

    Check for the connection with terminals.

    Q: Is the check result normal? 

    1. YES:  Go to Step 2.
    2. NO:  Repair the defective connector.
  2. STEP 2. Use an oscilloscope to measure the wave patterns of the primary pulley speed sensor and secondary pulley speed sensor. 

    Refer to OSCILLOSCOPE INSPECTION PROCEDURES  .

    Q: Is the check result normal? 

    1. YES:  Go to Step 3.
    2. NO:  Replace the primary pulley speed sensor or secondary pulley speed sensor.
  3. STEP 3. Symptom recheck after erasing diagnostic trouble code 

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction
    2. NO:  Replace TCM.
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