Grand AM V6-3300 3.3L (1992)
Chart C-16 Wiring Diagram
CIRCUIT DESCRIPTION:
The purpose of the torque converter clutch feature is to eliminate the power loss of the transmission converter stage when the vehicle is in a cruise
condition. This allows the convenience of the automatic transmission and the fuel economy of a manual transmission. Fused battery ignition is supplied
to the TCC solenoid through the brake switch, and transmission 2nd gear apply switch. The ECM will engage TCC by grounding CKT 422 to energize
the solenoid.
TCC will engage when:
^
Engine warmed up
^
Vehicle speed above a calibrated value. (about 33 mph 51 km/h)
^
Throttle position sensor output not changing, indicating a steady road speed.
^
Transmission third gear switch closed
^
Brake switch closed
^
TCC in-line apply switch closed
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
1.
Checks ECM RELAYS fuse and brake switch.
2.
Checks ECM for proper operation.
3.
Checks internal switches in transaxle.
DIAGNOSTIC AIDS:
The "Scan" tool only indicates when the ECM has turned "ON" the TCC driver and this does not confirm that the TCC has engaged. To determine if
TCC is functioning properly, road test the vehicle. Engine rpm should decrease when the "Scan" indicates the TCC driver has turned "ON."
