Toyota 90919-02234 Ignition Coil Assembly

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Primary and secondary resistance checks for ignition coil/igniter units on some Toyota and Lexus models don't apply to newer ones. The only test is to substitute a known good unit, which isn't practical for home mechanics. If all other ignition malfunction causes are ruled out, a faulty ignition coil/igniter unit is likely. To check primary resistance on some models, disconnect the electrical harness connector(s) from each coil and use an ohmmeter across the coil primary terminals. For secondary resistance, detach and label the spark plug wires from each coil and use an ohmmeter across the two secondary terminals. If resistance readings are off, replace the coil. When replacing, disconnect the battery's negative cable and follow specific removal and installation procedures for four-cylinder or V6 models.

Start by disconnecting the cable from the negative battery terminal and removing the engine cover. Then, disconnect the electrical connector from the ignition coil and remove the mounting bolt. Pull the coil straight up and out of the valve cover, ensuring the boot is in good condition before reinstalling.

This option isn't feasible for a home mechanic because you can't return electrical components to a parts department once you have purchased them.

With the ignition key OFF, disconnect the electrical harness connector(s) from each coil. Connect an ohmmeter across the coil primary terminals. If the resistance is not within specifications, replace the coil.