P2757

P2757-TCC PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE

For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


Theory of Operation


This DTC checks the mechanical operation of the Torque Converter Clutch (TCC). When the TCC is commanded on, there should be little or no difference between Engine speed and Input speed. If the TCM detects the TCC is slipping greater than a calibrated value, for 2 consecutive ignition cycles, this DTC will set.



When Monitored:
- No other DTCs set.
- TCC is commanded on.

Set Condition:
- Engine speed minus Input speed is greater than or equal to 200 rpm for 5 seconds for 2 consecutive ignition cycles.







Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure



Diagnostic Test


1. CHECK IF DTC IS CURRENT

Ignition on, engine not running.

With the scan tool, view DTCs.


NOTE: If there are any other Engine and/or Transmission DTCs, diagnosis those first.

Is the status Active or is the Starts Since Set counter 2 or less for this DTC?

Yes

- Go To 2

No

- Go To 4



2. CHECK THE TORQUE CONVERTER CLUTCH (TCC) OPERATION

Clear Transmission DTCs.

Road test the vehicle in a condition that will enable TCC lock up.

Using the scan tool, record the Engine speed and the Transmission Input speed during TCC lock up.

Using the set condition listed above, calculate the TCC slip rpm.

Is the TCC slip rpm greater than or equal to 200 rpm?

Yes

- Go To 3

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for shorts, corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.



3. CHECK INTERNAL TRANSMISSION

Turn the ignition off to the lock position.

Remove the transmission oil pan.

Check the internal transmission harness, pins, terminals, and connectors for shorts, corrosion, damage, or terminal push out.

Visually inspect the valve body for debris, damage or leaking hydraulic paths.

Visually inspect for sticking or binding Control Valve(s).

Were there any problems found?

Yes

- Repair as necessary.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test

No

- Replace the Torque Converter.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test



4. CHECK WIRING AND CONNECTORS

The conditions necessary to set the DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle the wires while checking for shorted and open circuits.

Check for any Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform AS68RC VERIFICATION TEST. AS68RC Transmission Verification Test

No

- Test Complete.