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bow1103 · Oct 20, 2009, 04:26 PM

Have a 1992 Honda civic that quit running while going down the road. Just shut off as if it is electrical in nature. Replaced distributor, main relay and integrated control unit on back side of fuse box. All fuses seem OK. No fire, no injector pulse and no power to the fuel pump. Check engine light stays on. From what I have read, should not be ECM trouble. Help.

TxGreaseMonkey · Oct 20, 2009, 04:30 PM

When you turn the ignition switch to ON (Position II), does the Check Engine Light (CEL) come on and then go off after 2 seconds? If not, the problem is with the ACG (ALT) (S) fuse, in the under dash fuse/relay box; ECM (perform the K-Test, below); main relay; or the ignition switch. Perform tests in that order.

. Check all under dash and under hood fuses, very carefully, with a test light or multimeter. Be thorough, especially on the ACG (ALT) (S) fuse.

. Perform the K-Test on the ECM: 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. My bet is that the ECM is bad.