P2769-TORQUE CONVERTER CLUTCH CIRCUIT LOW

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
CAN Bus
Set Condition:
If the actual voltage is 70% of the target voltage for the period of 1.0 second. 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 GROUND

TORQUE CONVERTOR CLUTCH SOLENOID

TORQUE CONVERTOR CLUTCH

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

With the scan tool, read Transmission DTCs.

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

Yes

Go To 2

Go To 5

2. CHECK THE (T59) TCC SOLENOID CONTROL CIRCUIT

Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Ignition on, engine not running.
With the scan tool, actuate the TCC Solenoid.
Using a 12-volt test light connected to ground, 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

Go To 4

3. CHECK THE TCC SOLENOID

Turn the ignition off to the lock position.
Reconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Disconnect the TCM C1 harness connector.
Measure the resistance between ground and the (T59) TCC Solenoid Control circuit in the TCM C1 harness connector.

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)

Replace the CV Transmission or the TCC Solenoid (Valve Body) per the Service Information.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

4. CHECK THE (T59) TCC SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off to the lock position.
Disconnect the TCM C1 harness connector.
Measure the resistance between ground and the (T59) TCC Solenoid Control circuit.

Is the resistance below 5.0 ohms?

Yes

Repair the (T59) TCC Solenoid Control circuit for a short to ground.

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

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)

5. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this 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.

Were there any problems found?

Yes

Repair as necessary.

Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

Test Complete.