View Full Version : Main relay clicks on my 89 honda
beansyoo
Jan 25, 2010, 04:23 PM
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
Jan 25, 2010, 04:30 PM
If the CEL stays on, the ECM may be bad.
beansyoo
Jan 25, 2010, 05:25 PM
What's the CEL?
TxGreaseMonkey
Jan 25, 2010, 05:29 PM
Check Engine Light.
TxGreaseMonkey
Jan 25, 2010, 05:35 PM
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
Jan 25, 2010, 05:37 PM
All right thanks
beansyoo
Jan 25, 2010, 05:42 PM
OK I had another ecu and its still doesn't start. What else could it be
TxGreaseMonkey
Jan 25, 2010, 06:35 PM
Is the "new" ECM any good?
beansyoo
Jan 25, 2010, 07:16 PM
Yeah