Question about Cars & Trucks
Car will not power up fuel pump or starter. Other ignition circuits work.
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Posted on Jan 02, 2017
Resistive cottection between PIP (pin6) wire and connector at the ignition module. Cleaned and soldered wire to connector pin. Runs fine.
Posted on May 28, 2009
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Jul 30, 2013 | Toyota Corolla Cars & Trucks
May 26, 2012 | 2005 Jeep Liberty
Mar 26, 2011 | 1995 Nissan Sentra
· 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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