The Integrated Ignition Assembly (IIA) system or the Electronic Spark Advance (ESA) system are used on all Celicas. On the ESA system, the ECU is programmed with data for optimum ignition timing under any and all operating conditions. Using data provided by sensors that monitor various engine functions (rpm, intake air volume, engine temperature, etc.) the microcomputer triggers the spark at precisely the right instant. The IIA system works basically the same way. One difference between the two is the integrated system has the ignition coil integrated within the distributor cap assembly.
Do NOT disconnect the battery while the engine is running.
Check that the igniter is properly grounded to the body.
Do NOT leave the ignition switch on for more than 10 minutes if the engine will not start.
Make sure your tachometer is compatible with the ignition system before hooking it up to the service connector of the distributor.
With a tachometer connected to the system, connect the test probe of the tachometer to terminal
of the check connector.
NEVER allow the tachometer terminals to touch ground as damage to the igniter and/or ignition coil could result.
Fig. Fig. 1 Connecting tachometer2S-E and 3S-FE engines shown
Fig. Fig. 2 Connecting tachometer3S-GE engine shown
Fig. Fig. 3 Connecting tachometer3S-GTE engine shown
Fig. Fig. 4 Connecting tachometer4A-FE and 5S-FE engines shown