[beansyoo]

I have an 89 honda with an ls swap, and it was running fine then the one time when I go to start, I turn the ignition on to auxiliary not trying to start it and the main relay clicks until I turn the key off. I replaced the main relay and fuses are fine. What else could be the problem? Thank

[TxGreaseMonkey]

If the CEL stays on, the ECM may be bad.

[beansyoo]

What's the CEL?

[TxGreaseMonkey]

Check Engine Light.

[TxGreaseMonkey]

Perform the K-Test on your ECM:

The K-Test: Remove the MAP Sensor connector and turn the ignition switch to ON (Position II). Using a multimeter, check for 5 volts going between the MAP Sensor connector's reference wire (+) and ground. As you look at the connector, this is the socket on the right. Really press the black test lead into a cleaned main ECM ground on the thermostat housing. If the voltage is low, it's probably indicating ECM failure. Most failed ECMs will record a fraction of a volt. To me, the K-Test is simple, elegant, and accurate.

[beansyoo]

All right thanks

[beansyoo]

OK I had another ecu and its still doesn't start. What else could it be

[TxGreaseMonkey]

Is the "new" ECM any good?

[beansyoo]

Yeah