Ok I've posted here before while troubleshooting this issue, and got many good ideas from people on these forums. My car is a 97' dx coupe 5spd 1.6 sohc non-vtech. The car will not start, fuel pump will not run, and I cannot get spark at the plugs. So far I have tried 3 PCM's, a brand new main relay from the Honda dealership, new cap and rotor. All fuses in the car check out ok, and with a test light I have confirmed I have power to the fuel pump, to the harness connectors that go to the PCM, and to the harness connector of the main relay. My check engine light comes on with thekey, and always stays ON, I hear no clicks, and I cannot get the fuel pump to run. Also I have confirmed 3 grounds so far from the engine to the chassis, one on each side of the head, and one from the thermostat housing going into the car's harness. I tried installing a jumper with my original PCM to pull the engine codes, and the check engine light didnt flash or do anything. Please if anyone has encountered a problem like this, or has any ideas, let me know. I have no idea where to go from here, I just want to drive my new car.

Thanks in advance,
Shad

 

You have OBDII. Does it respond when you connect a scanner to it?

It seems like the ECU isn't running at all. Get a schematic and confirm that you have battery voltage (with ECU connected) on ALL of the power supply pins, some are live all the time and some only with the key on. Also measure (with ECU connected) the voltage on all the ground pins and make sure it is close to 0 volts.

Edit: Also check that the pins that feed 5V to various sensors are outputting 5V. It's conceivable if there's a short that sensor wiring it would shut down the whole ECU.

 

what's "SV?" I don't understand that term

 

Its "5 V", 5 volts DC. The ECU provides a regulated voltage to power up the MAP, TPS , etc. sensors. You should get a volt ohm meter if you don't have one yet as it can do things that a test light won't.

 

ok, I read that wrong sorry, and I do have a digital multimeter, I just don't have the pinout's for the harness connectors, anyone know where I can get the pinout or schematics?