T.C.S. Electrical Circuits

Test requires special Toyota T.C.S. tester. It provides checks on electrical circuits to various sensors. Even if electrical check shows circuits to be in good condition, it is necessary to verify that vacuum components and distributor are functioning properly. To check electrical circuits, proceed as follows:

Fig 1: T.C.S. ELECTRICAL CIRCUIT CHECKER

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Pull off vacuum switching valve connector and plug in checker connector in its place. Attach ground connector to vehicle body and place checker on instrument panel.
   Fig 2: SYSTEM SCHEMATIC (F ENGINE)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn ignition switch on and push button on side of checker. All three lamps will light if the checker is in normal operating condition.
3. Running tests on T.C.S. system must be done at T.C.S. operating speeds and temperatures. To achieve speeds required for tests, either road test, place vehicle on a dynamometer, or raise up rear wheels. T.C.S. system is on whenever "TCS" indicator lamp on checker lights up.
4. On 2T-C engine only, the same procedures and checking instrument can be used to test electrical functioning of throttle positioner and mixture control valve. See illustration of circuit tester.