Question about Cars & Trucks
Fuses are good,no power at inertia switch
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Posted on Jan 02, 2017
where is the fuel pump pressure switch located no 1992 z28 camaro. also there are 3 wires coming out to fuel pump at back of car pink grey brown what do they go to.
Posted on Nov 10, 2008
Look to see if you have power at pin 1 of the circuit opening relay. The C.O. Relay is what powers the fuel pump. If you have power there (a blue wire), you have an open circuit between the relay and the pump.
Posted on Jul 17, 2009
At this point I would get a haynes manual from somewhere like autozone so you can get the wiring schematic. I believe the relay is turned on by the computer. It sounds like there is a wiring issue between the relay and the inertia switch. Have you checked the harness long the frame for damage or plugs in the engine bay.
Posted on Jan 02, 2010
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· Fuel Pump secondary circuit shorted to power
· Fuel pump relay contacts always closed
· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit
· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power
· faulty ECU
Engine Does Not Start:
· Open inertia switch or inertia switch circuit
· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)
· faulty ground connection at fuel pump
The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.
The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.
The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.
If all the above is working as designed, them you probably have a bad fuel pump.
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