Toyota 89621-41010 Igniter Assembly

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.