Grand Prix V6-191 3.1L (1989)
Chart C-8C Wiring Diagram
CIRCUIT DESCRIPTION:
The 2nd gear switch in this vehicle is open in 3rd and 4th gear. The ECM uses this signal to disengage the TCC when going into a downshift.
The fourth gear switch is open in fourth gear.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
4.
The switch state should change when the vehicle shifts into 2nd gear.
DIAGNOSTIC AIDS:
If vehicle is road tested because of a TCC related problem, be sure the switch states do not change while in 4th gear because the TCC will disengage. If
switches change state, carefully check wire routing and connections.