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Discussion Starter · #1 ·
I have a 2001 Cobra with just over 4,000 miles. I bought it new in 2001 and it is primarily a show car. I run it about once a month just to keep it going. Last week, I started it up and it ran rough. Thinking it was from not running for a while, I started to back out of the driveway and it quit. I put a code reader on it and it showed P0190 Fuel Rail Pressure Sensor Circuit Malfunction. I drained the tank, replaced the fuel and fuel filter, checked the fuse, cleared the code and tried to start it. No dice. Put the code reader back on and got a P1233 Manufacturer Contrl Fuel Air Metering. Connected a fuel pressure gauge and no fuel pressure at the rails. Cannot hear fuel pump run but I can hear the relay activate and deactivate in the CCRM. Battery is good and the engine turns smooth as usual. Any suggestions on where I should go from here, besides the dealer?
 

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I have a 2001 Cobra with just over 4,000 miles. I bought it new in 2001 and it is primarily a show car. I run it about once a month just to keep it going. Last week, I started it up and it ran rough. Thinking it was from not running for a while, I started to back out of the driveway and it quit. I put a code reader on it and it showed P0190 Fuel Rail Pressure Sensor Circuit Malfunction. I drained the tank, replaced the fuel and fuel filter, checked the fuse, cleared the code and tried to start it. No dice. Put the code reader back on and got a P1233 Manufacturer Contrl Fuel Air Metering. Connected a fuel pressure gauge and no fuel pressure at the rails. Cannot hear fuel pump run but I can hear the relay activate and deactivate in the CCRM. Battery is good and the engine turns smooth as usual. Any suggestions on where I should go from here, besides the dealer?
You said you can not hear the pumps run?? Before you head down to your local ford dealer be sure its not the pump thats gone bad. It almost sounds as if this is the problem. I would check there first.

A320
 

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Discussion Starter · #3 ·
I'm working my way to the fuel pump. I suspected that too, but it's not like I;ve pumped a lot of fuel through it with only 4000 miles on the car. There are some point-to-point checks I can do on the CCRM and the FPCM and work my way back to the fuel pump. As near as I can tell, the fuel pump relay is embedded in the CCRM - it's not a discrete unit like previous years. Do you know where the FPCM is physically located? Based on the illustration I have, it's in the rear but it could be under the car behind the gas tank, above the gas tank, or in the trunk somewhere. It's not real clear where it's at.
 

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Question: When you got the code on the FRPS why did you go to the tank and not the fuel rail and change the sensor? And the Fuel pump relay module is in the trunk on the driver's side.
 

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Discussion Starter · #6 ·
Here's why I didn't change the sensor and went to the tank first. With only 4K original miles, I suspected a simple problem. Since I never let the tank get down to less than half full before topping it off, I never completely emptied the tank in 8 years, therefore I initially suspected bad or contaminated gas or a possible clogged fuel filter. These were the simplest probable causes to eliminate. With known good fuel and filter, I connected a fuel pressure gauge to the schrader valve on the fuel rail and had no fuel pressure. According to the Ford workshop manual, I should have about 30+ psi with key on, engine off. Also, according to the diagrams in the manual, the fuel pump relay is in the CCRM. The inertia fuel shutoff switch is in the trunk on the drivers side, and I already checked it and it is good and has not been tripped.
 

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You need to read your manual one more time, especially page 25-6 in the wiring diagrams. It shows the fuel pump driver module that is fed data from the PCM to run the pump; power comes through the inertia switch and the CCRM. If you don't have the Ford service DVD, shoot me your e-mail address and I'll send you the page showing the wiring diagram.
 

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Discussion Starter · #8 ·
I do have the Ford DVD and I have been using it. When key is on, I have 12V at pin 5 of the CCRM , 12V at both pins of the inertia switch with the cable connected, and 12V at pin 9 of the FPDM with the cable disconnected from the module. I know the FPDM gets data from the PCM during operation but is there any data fed to the FPDM from the PCM to initially pressurize the fuel rails? Do you know what I should have at pins 3 and 10 of the FPDM when the cable is connected to the FPDM and the key is on? Can I get to C420 without dropping the tank?
 

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The fuel rail should maintain fuel pressure from the PPRV in the tank.
Check for voltage across pins 3 and 10 of the FPDM. I don't think you can see C420 w/o dropping the tank some. If you have voltage across 3&10 and the pump doesn't run...it's dead. You might disconnect C451 and apply 12v to pins 3&10 to double check the pump.
 

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Bn/Pk (pin 10) is positive on the FPDM connector.
 

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Discussion Starter · #11 ·
I already checked 3 to ground and got .1V. I checked 10 to ground and got 12.3V. I checked between 3 and 10 with the FPDM connected and got just north of 12V. I assume the pump varies in speed based on the differential between 3 and 10. I guess the differential is determined by the PCM feeding data to the FPDM. If I apply a 12V source between 3 and 10 (with the FPDM disconnected) to double check the pump , which would be the negative - 3 or 10? I am assuming 3. I'm not looking forward to dropping the tank to get to the fuel pump.
 

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10 is the positive pin.
 

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Discussion Starter · #13 ·
I really appreciate all your help. I am going to attempt to verify the fuel pump but I can't do any more today. I'll let you know how that turns out. Meanwhile, I'm going to start making preparations for dropping the tank. Thanks 99blkcobravert.
 

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You are welcome. Good Luck!
 

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Discussion Starter · #15 ·
It does seem the fuel pump is the problem. I was able to get to C420, disconnected it, and measured resistance between the BRN/PNK and BLK/RED which should go directly to the pump motor windings. The resistance was infinite (i.e open circuit). Picked up a new Ford pump module and checked resistance and it read 1.4 ohms. Pulled the tank today but didn't get to the pump replacement because of tornado watches in the area.

If a new pump doesn't fix the problem, I think it might be the PCM. If I have to replace the PCM, do I have to have it programmed by Ford?
 

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Usually you buy the PCM with the stock catch code in it from Ford. If you do need one, call Steve @ Tousley Ford for cost +10% @ 800-328-9552.
 

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Discussion Starter · #17 ·
Well, I replaced the fuel pump, the car is back together, and it runs as good as ever. Removing the tank grommet was a bear! The tank went in a lot easier than it came out. I turned the key on once without starting and got 10lbs of pressure, turned it off and on again and the pressure went to 20 lbs. The third time I turned the key on, I got 40 lbs. Went to start and it cranked right up, let it run for about 5 minutes and checked the codes and got none. It seems funny that I initially got a P0190 when the car initially stopped running. After clearing the code and trying to start without success, I then got a P1233. I would have expected to get an error code directly related to the fuel pump like P0230, P0231, etc. but no such luck. Anyway, it's back in operation. Many thanks again to 99blkcobravert.
 

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You are welcome; that's what this forum is all about. Good to hear you have your car up and running again!
 

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1996 Mustang Cobra fuel problem

It sounds like you guys are very knowledgeable and have access to manuals ect.
Maybe you can help with a fuel problem on my 96 cobra.

The vehicle is a low mileage daily driver (60k miles) and was running fine until this weekend. Now it wont start. The battery and starter are fine so I suspect a fuel problem. I can't hear the pump running so I suspect a bad fuse or relay.

Does anyone have access to a wiring diagram for the 96 cobra?
Where is the fuel pump relay located on this vehicle?

Thanks,
-JC
 

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Discussion Starter · #20 ·
I don't have anything specific for the 96, but I am led to believe the fuel pump relay is under the driver's seat on years earlier than mine, but I can't say for certain. Mine is integrated into the Constant Control Relay Module located in the right front fender well, but I am not sure about the 96. Also, make sure you check your inertial switch. This should be located in the trunk near the left rear tail light. There should be an opening to press the reset button if it tripped, but it's not likely unless the car was jarred. Don't rule out the fuel pump just yet. That's the way mine acted when the pump went out. I can give you wiring diagrams for an 01 but I'm not sure it would help you.
 
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