S15/T15 Jimmy 2WD L4-119 1.9L VIN A 2-BBL (1983)
FIGURE 2 - TERMINAL SWITCHES
Also, the switches may be designed with either one or two terminals (see Figure 2). Single terminal switches are used to provide an electrical ground
while two terminal switches act as connecting switches.
Specific Switch Function
FIGURE 3 - TORQUE CONVERTER SIGNAL SWITCH
"Torque Converter Signal" Switch (P/N 8642473)
This is a single terminal normally open switch. The function of this switch is to make an electrical ground when the converter clutch is applied and
break the ground when the clutch is released. For all 1982 and 1983 non-ECM vehicles with TCC signal, this switch is wired in series with the 3rd
clutch switch (see Figure 3).
3rd Clutch Switch (P/N 8643710)
This is a two-terminal normally open switch. It is currently wired in series with the TCC signal switch and allows current to flow to the TCC signal
switch only when the transmission is in third gear, although the high altitude option is an exception. The combined function of the 3rd clutch switch
and the TCC switch is as follows:
Twelve (12) volts D.C. 0.20 amp electric current is sent across the EGR solenoid (60 ohms). With either switch open, the current cannot flow.
This signals the EGR solenoid that the transmission is not in third gear and that the converter clutch is released. When the transmission is in
third gear and the converter clutch is applied, the electrical current from the EGR solenoid flows through the 3rd clutch switch and grounds
through the TCC signal switch. This signals the EGR solenoid to release emission control (see Figure 3).
4-3 Downshift Switch (P/N 8642346)