TCC in Drive Mode: Notes

WARNING: This page is about a different variant/trim than selected.

This OSC function is used to test whether the torque converter clutch is engaging and disengaging correctly.

CAUTION: Technicians should maintain an engine speed of at least 1,500 rpm during torque converter engagement testing. Failure to maintain at least 1,500 rpm can produce severe vehicle lugging and vibrations depending upon driving/vehicle loading conditions. During output state control testing, the TCC could oscillate between engaged and disengaged mode if engine speed requirements are not followed.

The OSC function for the TCC parameter allows the technician to choose the following:

TCC - activates TCC OFF and ON.
ON - turns TCC ON.
OFF - turns TCC OFF.

OSC "TCC OFF" DRIVE Mode operates ONLY when:

VSS and TR sensors are operational.
No VSS and TR sensor DTCs present.
Engine ON.
Transaxle range selector lever in O/D.
Vehicle speed is greater than 3 km/h (2 mph).
No transaxle gear shifts are in progress.

OSC "TCC ON" DRIVE Mode operates ONLY when:

VSS and TR sensors are operational.
No VSS and TR sensor DTCs present.
Engine "ON".
Transaxle range selector lever in O/D.
Vehicle speed is greater than 3 km/h (2 mph).
Transaxle in second or higher gear.
TFT is between 16°C and 133°C (60°F and 270°F).
Brake is "OFF" when vehicle speed is below 20 mph.
Engine speed at least 1,500 RPM.
Speed ratio across the converter (PID "TCCRAT") is between 0.70 and 1.05.
No transaxle gear shifts are in progress.

OSC Command Values

OFF - Turns TCC OFF.
ON - Turns TCC ON.
XXX - Cancels OSC value sent.
SEND - Sends the values to PCM.