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Posted on Jul 20, 2011

ECU - Fuel Pump not pumping - XJ6 Jaguar Cars & Trucks

5 Related Answers

Anonymous

  • 3 Answers
  • Posted on May 17, 2009

SOURCE: 95 Civic Fuel pump not turning on

You said you baught a new pump, filter and relay, get a voltmeter or agitator and test each of the wires, if your not getting power to it then its probably a hot wire coming from your battery terminal or one of the wiring harnesses coming out of your firewall, you probably know that the fuel pump access panel is underneath the back seat so take it off, test the ground first with the car on then test each individual hot wire, if you find a faulty wire see if you can manually fix it, if not then run a hot wire from the source using speaker wire or something similar until it turns on for you at contact with the ran hot wire, just be sure that you do hav gas in the pump while testing wires just not enough to blow yourself up lol, otherwise you will burn out your fuel pump motor.

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Anonymous

  • 4 Answers
  • Posted on Jun 13, 2009

SOURCE: Starting problem

i would try replacing your fuel filter, If that doesn't work (which it should) then because its a 2005, there should be a relief valve on the fuel rod, try opening the valve to see if there is fuel gettin that far. then get back to me.

Anonymous

  • 23 Answers
  • Posted on Jul 25, 2009

SOURCE: 1989 Cavalier stalled while on hway

no check a sensor called an e.s.t it controls fuel/spark

Anonymous

  • 6982 Answers
  • Posted on Aug 15, 2009

SOURCE: 2001 Dodge Grand Caravan Sport 3.3L Flex Fuel ECU Problem

PS...ignore person who answered...he is an intruder, and not part of the "team" !!!

Anonymous

  • 4803 Answers
  • Posted on Oct 11, 2009

SOURCE: I have a 93 mercury topaz 4cyl 2.3L that stalls

It sounds to me like you replaced everything but the most likely cause of a stall while driving...The crank sensor.

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How do you bypass ecu to fuel pump wiring on a 1995 gl1500A

You can only make a manual circuit over the ignition to your Fuel pump .
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No power at fuel pump 99 geo metro 1.0 liter why

your problem Can be fuse /relay broken damaged corroded wire /connection
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How do i fix no pulse to injectors but got good spark all 6 cylinders?

Yup. Fuel supply problem. Could be a number of things. Check if the injectors are clicking when you crank. no click, no power to the injectors, problem with sensors data to the Ecu. If click, that part is not the problem. More likely Fuel pressure regulator is bad, not enough pressure, or fuel pump relay which controls the fuel pump. So either may be bad or connections are bad or wires cut. Fuel filter may be clogged. To test th fuel pump, you can jump from the battery positive to pump terminal for a short time to verify the pump is good. so then connections at pump, or from the fuel pump relay or it's connections to the ECU. Most disastrous may be the Ecu itself. Other sensors to the Ecu could contribute, but usually with code problems including sensors it goes into a "limp home" mode. overriding bad sensor inputs. If somehow you can get the error codes read at auto parts store, that may give you more clues than I can guess at. Good luck, hope this helps you out.
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I have 1995 toyota 4runner I can't find where fuel pump relay location or do it have one.

There is a relay. Its mounted with the EFI ECU in the right kick pannel. The ECU controls the relay via a ground in the computer and turns on the pump for cranking and for when the engine is running. The relay is almost never the issue. Check the fuel pump wiring at the tank and the fuse for the ECU and fuel pump.
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Fuel system wiring diagram

which engine? 2.5 or 4L ,,, always engine first...... ill post for 4liter.
the first test on all EFI, (varies rules) but here it is.
many cars only have power to the pump cranking and running (ONLY)
(crash and burn rules... dig it?)
so use the meter this time and crank.
fuses first check.

btw, alldata.com has that, login and look, like us.
see schem linked here. its real simple and is online. (goggle)

this EFI pump in 1993, is 100% controlled by the ECU. at all times
Fuse 1, blown kills pump dead.
software (firm) in the ECU controls this.
http://www.fixkick.com/look/odds-ends/jeep/93wrangler-EFI-4L.jpg

if cranking , pump is dead, check coil for 12v, on fuel pump relay
if not 12v across coil, cranking the ECU is bad.
or ECU detects spark loss, again, crash and burn logic in the ECU.

the ecu monitors spark at all times. if bad it cuts fuel
even if spark is GOOD. ! and spark feed back is bad.
that is pin 44 on ECU is dead......... for any reasons.....





2helpful
2answers
0helpful
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FUIL PUMP DONT GET ANY POWER

The ecu might have gone bad, not supplying power to the fuel pump relay. If the check engine light does not come on, on the dash, when the ignition is turned on, then the ecu is in need of repair.
1helpful
2answers

Fuel pump just stopped,ECU-I.G fuse burnt changed fuse , still don't hear pump,if line was blocked would pump shutdown?

FUEL PUMP MORE LIKELY WORN OUT SHORT OUT.BESURE REPLACE FUEL PUMP WIRES IF FUEL PUMP HAS TO BE REPLACED.CODE SCAN FOR ECU FAULT. IF FUEL FILTER STOPPED UP FUEL PUMP WILL SHORT OUT.
1helpful
1answer

Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good

  • Code 542 indicates one of the following conditions:

Engine Starts:

· 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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1answer

Intermittent fuel pump

normally the ECU gets the message from the pressure regulator unit , tells the ECU when pressure in the fuel rail is reached and the pump is not needed until pressure falls below a preset level
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