P2770-TORQUE CONVERTER CLUTCH CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The Transmission Control Module monitors two signals from the TCC Solenoid during normal operation. One is the feedback electric current of the TCC Solenoid and the other is the voltage between ground and the TCM termination for the TCC Solenoid.


  • When Monitored:

    Ignition on, engine running with the transmission in a valid forward gear.

    Vehicle speed greater than 10 Km/h (6 mph).

    Accelerator Pedal Position (APP) greater than 12.5%.

    Engine rpm greater than 450 rpm with TCC lock-up enabled.

    TCC Lock up command is ON (True).

    No DTCs active from the following:

    Step motor, Line Pressure Solenoid, Secondary Solenoid, Input and Output Speed Sensor, Primary or Secondary Pressure Sensor, or CAN BUS.

  • Set Condition:

    If the target current is greater than 0.75 amps and the monitored current is less than 0.4 amps for the period of 5 seconds. It takes two consecutive problem identification trips for the DTC to mature and illuminate the MIL.


Possible Causes
  
(T59) TCC SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE
  
(T59) TCC SOLENOID CONTROL CIRCUIT OPEN
  
TORQUE CONVERTOR CLUTCH SOLENOID
  
TRANSMISSION CONTROL MODULE
  

Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK TO SEE IF THE DTC IS ACTIVE



Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?

Yes
  • Go To 2


No
  • Go To 6

2.CHECK THE (T59) TCC SOLENOID CONTROL CIRCUIT








NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly?

Yes
  • Go To 3


No
  • Go To 5

3.CHECK THE (T59) TCC SOLENOID CONTROL CIRCUIT FOR A SHORT TO VOLTAGE









Is the voltage above 0.5 volts?

Yes


No
  • Go To 4

4.CHECK THE TCC SOLENOID







Is the resistance between 3.0 and 9.0 ohms?

Yes
  • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)


No

5.CHECK THE (T59) TCC SOLENOID CONTROL CIRCUIT FOR AN OPEN









Is the resistance above 5.0 ohms?

Yes


No
  • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

6.INTERMITTENT WIRING AND CONNECTORS





Were there any problems found?

Yes


No
  • Test Complete.