6000 V6-191 3.1L (1989)
Test Description:
Numbers below refer to circled numbers on the diagnostic chart.
1.
Some "Scan" tools display the state of these switches in different ways. Be familiar with the type of tool being used. Since both switches should be
in the closed state during this test, the tool should read the same for either the 2nd or 3rd gear switch.
2.
Determines whether the switch or signal circuit is open. The circuit can be checked for an open by measuring the voltage (with a voltmeter) at the
TCC connector (should be about 12 volts).
3.
Because the switch(s) should be grounded in this step, disconnecting the TCC connector should cause the "Scan" switch state to change.
4.
The switch state should change when the vehicle shifts into 2nd gear.
Diagnostic Aids:
