Q: How do you test the ignition coil on Honda Prelude?
A: To test the ignition coil for the F2281 engine, first disconnect the negative battery cable and remove the distributor cap. Detach the black/yellow and white/black wires from the terminals marked A(+) and B(-). Measure the resistance between both terminals using an ohmmeter; the primary winding resistance should be 0.45-0.55 ohms, and the secondary winding resistance should be 16.8-25.2 ohms. After reconnecting the battery, reset the Powertrain Control Module (PCM) idle memory by starting the engine and holding it at 3000 rpm until the cooling fan activates, then let it idle for five minutes with all accessories off and the transmission in Park or Neutral. For the F2282 engine, follow similar steps, ensuring the primary winding resistance is between 0.64-0.78 ohms and the secondary winding resistance is between 14.4-21.6 kilohms. For the Prelude, turn off the ignition, detach the 4-prong connector and ignition coil wire, and measure the primary and secondary winding resistances, replacing the ignition coil if necessary. For the 2.3L engine, after disconnecting the negative battery cable and removing the distributor cap, measure the resistance between the coil terminals, replacing the coil if the primary winding resistance is not within 0.45-0.55 ohms or the secondary winding resistance is not within 16.8-25.2 kilometers. For the 2.7L engine, after detaching the negative battery cable and removing the distributor cap, unplug the 4-prong connector and ignition coil wire, then measure the primary and secondary winding resistances, replacing the coil if the primary resistance is not between 0.3-0.4 ohms or the secondary resistance is not between 14-22 kilohms. For the 3.0L engine, after disconnecting the negative battery cable and removing the distributor cap, unplug the 3-prong connector and ignition coil wire, then measure the primary and secondary winding resistances, replacing the coil if the primary resistance is not between 0.34-0.42 ohms or the secondary resistance is not between 17.1-20.9 kilohms. For removal and installation of the ignition coil on the 2.2L and 2.3L engines, disconnect the negative battery cable, remove the distributor cap, mark the rotor position, and follow the steps to remove the ignition coil, ensuring to reset the PCM idle memory after installation. For the 2.7L and 3.0L engines, disconnect the negative battery cable, detach the electrical connector and ignition coil wire, remove the mounting bolts, and follow the reverse procedure for installation, also resetting the PCM idle memory afterward.