hi can eny 1 help me with this problem
i have honda civic crx 92 D16A9 some time dont want to start wen it dont want to start i dont hear the fuel pump dont matter if its cold or hot.i leave it some time it works
Main Relay 100% ok i tested it.ignition switch is new.

txgreasemonkey

Your ECM may be failing and preventing the second relay in the main relay from closing. When this happens, the fuel pump won't run. Run the K-Test (see Sticky).

joecrx

ok
how do i run k-test

joecrx

i fawned it

txgreasemonkey

Here's how:

The K-Test: Remove the MAP Sensor connector and turn the ignition switch to ON (not start). 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.

joecrx

thanks
its late now ill do that tomorrow 1st thing and let u no

joecrx

hi
i did the k-test im reading 4.9volts. dos that mean i have to chang ECM or thers a way to fix it

txgreasemonkey

Your ECM pasts the K-Test and it shouldn't be the cause of your car not starting. I know you think your main relay is good, but if your fuses are good and your ECM is good, the problem is likely with the main relay. My advice is to resolder it or install a new one.

joecrx

can the wire harness coz the problem. im using bran new main relay i did this test it past

Remove the main relay.
Attach the battery positive terminal to the No. 4 terminal and the battery negative terminal to the No. 8 terminal of the main relay. Then check for continuity between the No. 5 terminal and No. 7 terminal of the main relay.
If there is continuity, go on to step 3.
If there is no continuity, replace the relay and retest.
Attach the battery positive terminal to the No. 5 terminal and the battery negative terminal to the No. 2 terminal of the main relay. Then check that there is continuity between the No. 1 terminal and No. 3 terminal of the main relay.
If there is continuity, go on to step 4.
If there is no continuity, replace the relay and retest.
Attach the battery positive terminal to the No. 3 terminal and battery negative terminal to the No. 8 terminal of the main relay. Then check that there is continuity between the No. 5 terminal and No. 7 terminal of the main relay.
If there is continuity, the relay is OK; If the fuel pump still does not work, go to Harness Test.
If there is no continuity, replace the relay and retest.

txgreasemonkey

Bench testing a main relay doesn't mean much, since you don't have the ability to simulate the heat that causes bad solder joints to act up.

From my experience, main relays should be replaced every 10 years or 100,000 miles, whichever comes first. They are a very problematic component.