DTC 39

DTC 39:

TCC Circuit:

CIRCUIT DESCRIPTION:
The purpose of the Torque Converter Clutch (TCC) is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise condition. This allows for the convenience of the automatic transmission with the fuel economy of a manual transmission.
Switched battery voltage is supplied to the TCC solenoid located on the valve body. When the PCM/TCM closes the TCC driver, the solenoid will activate a valve within the valve body. Pressure then will be applied to the torque converter clutch. The PCM/TCM will continue to open and close the TCC driver very rapidly to modulate pressure.

TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the diagnostic chart.

DTC 39 will set if:

^ TCC is engaged.

^ TCC "slip" is greater than 65 RPM for 2 seconds.

^ 2nd or 3rd gear is selected or indicated.

1. This test checks if transmission is receiving a TCC command to the pass-thru connector

2. This test checks for voltage to the transmission.

3. This test checks if PCM/TCM is commanding TCC "ON."

DIAGNOSTIC AIDS:
Clear DTC(s) and re-check for DTC 39. If DTC resets, fault could be internal to the transmission. Refer to SECTION 7A17A for "Symptom Diagnosis."

DTC 39 will only set in third gear. TCC slip in fourth gear will set DTC 68.