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Home >> Fiat >> 2017 >> 124 Spider Classica, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 ((Aw6R31 Automatic Transmission Control Module (TCM) - Electrical Diagnostics)) >> DTC Troubleshooting >> P0722-00 Output Shaft Speed Sensor Circuit No Signal >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK TRANSMISSION CONTROL MODULE (TCM) WIRING 
    1. Go to Key-OFF status.
    2. Disconnect connector A of the Transmission Control Module (TCM).
    3. Check whether the terminals of the Transmission Output Speed Sensor on Transmission Control Module (TCM) (D and C of connector A) are disconnected, damaged or corroded.

      Are terminals disconnected, damaged or corroded?

      Yes 

      • Repair or replace the connector or the terminals.
      • Go to Step  7.

      No 

      • Go to Step  2.
  2. CHECK TRANSMISSION OUTPUT SPEED SENSOR WIRING 
    1. Check for the presence of an open circuit on the wiring between the Transmission Output Speed Sensor and Transmission Control Module (TCM) (PIN D and C of connector A).

      Is there an open circuit?

      Yes 

      • Remove the open circuit on the wiring.
      • Go to Step  7.

      No 

      • Go to Step  3.
  3. CHECK TRANSMISSION OUTPUT SPEED SENSOR WIRING 
    1. Check for the presence of a short circuit to ground on the wiring of Transmission Output Speed Sensor (PIN D and C of connector A of Transmission Control Module (TCM)).

      Is there a short circuit to ground?

      Yes 

      • Remove the short circuit to ground on the wiring.
      • Go to Step  7.

      No 

      • Go to Step  4.
  4. CHECK TRANSMISSION OUTPUT SPEED SENSOR WIRING 
    1. Go to Key-ON condition (engine off)
    2. Measure the voltage on terminals D and C of connector A of Transmission Control Module (TCM)
    3. Ensure that the voltage measured on terminals is 0 volts.

      Is the measured voltage 0 volts?

      Yes 

      • Go to Step  5.

      No 

      • Resolve the short circuit to battery on one of the terminals.
      • Go to Step  7.
  5. CHECK TRANSMISSION OUTPUT SPEED SENSOR WIRING 
    1. Go to Key-OFF status.
    2. Disconnect the Transmission Output Speed Sensor connector.
    3. Check whether the terminals of the Transmission Output Speed Sensor are disconnected, damaged or corroded.

      Are terminals disconnected, damaged or corroded?

      Yes 

      • Repair or replace the connector or the terminals.
      • Go to Step  7.

      No 

      • Go to Step  6.
  6. CHECK CORRECT OPERATION OF TRANSMISSION OUTPUT SPEED SENSOR 
    1. Connect the diagnosis equipment to the Transmission Control Module (TCM) and check correct operation of the Transmission Output Speed Sensor.

      Is the Transmission Output Speed Sensor working properly?

      Yes 

      • Go to Step  7.

      No 

      • Replace the Transmission Output Speed Sensor.
      • Go to Step  7.
  7. CHECK CORRECT OPERATION OF TRANSMISSION CONTROL MODULE (TCM) 
    1. Perform the Transmission Control Module (TCM) error deletion procedure.
    2. Start the engine.
    3. Heat engine and gearbox.
    4. Drive the vehicle with automatic transmission selector in D position and ensure that the gear is shifted from the first to the sixth.
    5. Check whether there is a fault.

      Is the error still present?

      Yes 

      No 

      • End of diagnosis.
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