TCS System
- With ignition switch on, disconnect wire connector from solenoid vacuum valve. Connect wire lead of test light to ground and touch test light probe to each terminal of connector. Test light should glow at one of the terminals, if not, ignition portion of TCS system is defective.
- With transmission in Neutral, connect wire lead of test light to battery positive post. Touch probe end to solenoid vacuum valve ground wire terminal at connector which made light glow in previous test. Test light should glow. If test light does not glow, go to next step.
- Disconnect wire at solenoid control switch. Connect one end of a jumper wire to switch wire connector and other end to ground. If test light glows when jumper wire is grounded, solenoid control switch is defective. If light does not glow, control switch wire is defective.
- Disconnect vacuum hose from vent side of solenoid vacuum valve. Connect vacuum gauge to solenoid vacuum valve where hose was disconnected. Start engine. With solenoid vacuum valve attached, no vacuum should be present. If vacuum is present, replace solenoid vacuum valve.
- Disconnect wires from solenoid vacuum valve. Ported vacuum (manifold vacuum on 6-cylinder CJ models) should be present, if not replace solenoid vacuum valve. Place transmission in high gear position (manual transmission), raise drive wheels and operate vehicle over 38 MPH (automatic transmission), test light should go out. If test light continues to glow, solenoid control switch is defective and must be replaced.
Courtesy of CHRYSLER GROUP, LLC