Toyota 89621-41010 Igniter Assy

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This guide doesn't apply to integral ignition coil/igniter units on 2000+ Avalon and 1999+ Lexus ES 300 models. Testing these units is complex and best left to professionals. You can check the ignition confirmation signal, but identifying a bad igniter is a process of elimination. If suspected, have it tested by a dealer or qualified repair shop. Start by disconnecting the igniter's electrical connector. Check for battery voltage on terminal no. 9, 5.0 volts at terminal no. 4, and a fluctuating 0.1 to 4.5 volt signal at terminals no. 5, 6, and 7 while the engine is cranked. Also, check for continuity to a good chassis ground at terminal no.If all checks are good, reconnect the igniter, disconnect the ignition coils, and check for an ignition coil trigger signal. If absent, check the circuits from the igniter to the coils. If circuits are good, replace the igniter.

The following procedure does not apply to the integral ignition coil/igniter units used on 2001 and later models, as testing the igniter function of these units is beyond the scope of the home mechanic. You can check the ignition confirmation signal of each igniter, but identifying a bad igniter is simply a process of elimination. If you suspect a bad igniter on one of these models, have the ignition coil/igniter unit tested by a dealer service department or a qualified repair shop. When performing the following checks, disconnect the electrical connector from the igniter and conduct electrical checks at the igniter harness connector with the ignition switch On. Check for battery voltage on terminal no. 9; if absent, check the circuit from the igniter to the battery. Check for approximately 5.0 volts at terminal no. 4; if not present, have the PCM checked by a dealership service department or other properly equipped repair facility. Check for a fluctuating 0.1 to 4.5 volt signal at terminal no. 5, 6, and 7 in turn while an assistant cranks the engine; if absent, have the PCM checked. Check for continuity to a good chassis ground at terminal no. 3. If the checks are good, turn the ignition switch Off and reconnect the electrical connector to the igniter. Next, disconnect the electrical connectors at each ignition coil and, using an LED test light, check for an ignition coil trigger signal at each ignition coil connector while an assistant cranks the engine. If no ignition coil trigger signal is present, check the circuits from the igniter to the ignition coils for continuity; if the circuits are good, replace the igniter.