Mechanics

WON'T START

2001 Ford Escape

Electrical problem
2001 Ford Escape 6 cyl Front Wheel Drive Automatic 38000 miles

Hi. This Escape won't start. I put my scanner on it and received the following error codes:

FORD. ENGINE. FUELSYS Fuel System Status

(Open/Closed Loop) Open Loop


And also:

P0232 - Fuel Pump Secondary Circuit High

I checked the fuse and it is OK. I don't know how to check the relay. I also don't know where the fuel pump is (Under the front passenger seat?) To check it. What do you think?

Thanks,

Jim Rooney
Avatar
Jimrooney
January 5, 2009.




Check the fuel pressure with a fuel pressure gauge designed for your fuel system and comeback with the readings this is where we start-

Or do below and tell me what happened-let me know asap

Get a starting fluid or ether and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it

P0232 Engine Fuel Pump ckt

The fuel pump secondary control circuit deals with the fuel pump driver module (another word for computer) which is use to regulate the fuel pump pressure. By using a fuel sensor located in the fuel rail, the engine computer can regulate the fuel pump pressure by monitoring the fuel pump duty cycle. Using this duty cycle range, the computer can determine when to shut off or increase the fuel pressure for optimum engine performance. Therefore, if the duty cycle is below or higher than the targetted range, it will set a code like the above or a code related to the fuel pump secondary control circuit which could have an errant reading. When this happens, the fuel pump driver module will set at a default usually set at 100 % duty cycle. For basic test, check connections of the wirings/grounds related to this circuit by using ATS wiring diagram.

Notes about your fuel injector circuits compared to your fuel pump: When injectors operate, it pulse or open/close quickly and are monitored in terms of milliseconds beside having a changeable duty cycle. The flow rates for injectors are calculated when they are in a stationary condition which means the injectors are held open all the time. (This is condition is called as a 100% duty cycle). When checking high performance engines, most injectors works best when they are flowing at a 70% to 90% duty cycle. This means that they run 70% to 90% of the static flow rating as specified. In essence, using an injector with this parameter can help decrease heat generated within the motor windings of the injector which lead to premature failure.

NOTE: duty cycle means how much fuel is delivered and also by how long the injector is energized by the computer driver circuit inside the engine computer.

Finally, injectors can also be categorized by their resistance to the electromagnetic force which opens the coil inside the injector body. Such resistance (in ohms) is also called impedance. If you have high impedance injectors, it rates at 12 to 16 ohms while low impedance injectors rates at 2 to 5 ohms. If your injector resistance is not vwithin this range, the injector is defective.
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Tiny
Rasmataz
Jan 5, 2009.
Hi. The information in your response gives a lot of information but none that I can really use. I don't have a helper.

I asked for the location of the fuel pump and you didn't tell me that.

I also asked about the open/closed loop and you didn't address that either. Please address my questions.

Tiny
Jimrooney
Jan 6, 2009.
I asked for the location of the fuel pump and you didn't tell me that.

1. The fuel pump is in the fuel tank

I also asked about the open/closed loop and you didn't address that eit

2. The coolant temperature and the oxygen sensors controls the closed and open loop-when the engine is cold the CTS controls fuel demand till it reaches a given temperature and switches to closed loop at which time O2 sensor controls the fuel demand. Have these sensors checked out

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode

Tiny
Rasmataz
Jan 6, 2009.

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