Toyota Camry Fuel Pump Problems?

27 Mar 2015 | Author: | Comments Off on Toyota Camry Fuel Pump Problems?

Questions and Answers

Toyota Fuel Pump Problems?

Q. Mr. I have a 1997 Toyota 2.2 liter FS-FE engine 68,000 miles and an automatic The car had a fault code P0171 System Lean. At first I the EGR valve found it leaking and cleaned it, the light came on. I then blocked off the EGR valve and had the code.

I checked fuel and found it high, 55 psi.

I the pump and regulator. The code has not My problem now is I do not have the two second pump prime when the key is on. I am afraid it is a computer problem.

I checked the camshaft sensor and it to be working fine.

The manual this signal is needed for the pump while running. The car fine. But twice in the last while troubleshooting it has run rough no power.

It seemed to be missing on one

The first time it happened was I pulled the EFI fuse and put a jumper in to the fuel pump with an The second time was after the and regulator replacement. Both it only lasted for a couple of prior to being able to a cylinder.

I know this happen again. But I am not sure the rough running and the no two second are related. The only thing at point that I can surmise connects the two is the cam sensor.

Any advice would be greatly

Thank You in advance,

A. There are differences between a California and vehicle. For the sake of the answer going to assume it is a non-California

DTC P0171 System Too Lean Trim) (Without California

CIRCUIT DESCRIPTION:

Fuel refers to the feedback compensation compared against the basic time. Fuel trim short-term fuel trim and fuel trim.

Short-term fuel trim is the fuel compensation used to the air-fuel ratio at its ideal value. The signal from the oxygen sensor indicates the air-fuel ratio is RICH or compared to the ideal theoretical triggering a reduction in fuel if the air-fuel ratio is rich, and an in fuel volume if it is lean.

fuel trim is overall compensation carried out long-term to for continual deviation of the short-term trim form the central due to individual engine differences, over time and changes in the environment.

If both the short-term trim and long-term fuel are LEAN or RICH beyond a value, it is detected as a malfunction and the MIL up.

P0171 detecting conditions:

the DTC P0171 is recorded, the actual ratio is on the LEAN side. DTC P0172 is recorded, the actual ratio is on the RICH side.

If the runs out of fuel, the air-fuel is LEAN and DTC P0171 is recorded. The MIL comes on.

There are a few possible There could be a loose air hose, low fuel pressure, a injector, bad HO2S, bad Manifold Pressure (MAP) sensor or a bad Temperature Sensor (CTS).

The condition will make the run rough.

P0171 is usually accompanied by a code.

P0300 – Misfire Detected

P0301 Cylinder 1 Misfire

P0302 Cylinder 2 Misfire

P0303 Cylinder 3 Misfire

P0304 Cylinder 4 Misfire

As for the no two second it has to be there as you can plainly see in this

In the diagram above, when the is cranked, current flows terminal ST of the ignition switch to the relay coil and also flows to terminal STA of ECM (STA

When the STA signal and NE, (Crankshaft Sensor), signal are input to the Tr is turned ON . current flows to of the circuit opening relay, the switches on, power is supplied to the pump and the fuel pump

While the NE signal is generated running), the ECM keeps Tr ON (circuit relay ON ) and the fuel pump keeps operating. If the ECM does not the NE signal after three it turns Tr OFF and turns the fuel off.

Additional Information courtesy of AllDATA

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2003-2004 Vincent T. Ciulla

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