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BA Turbo - PCM & Fuel Pump Issues


mc03

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I'm dealing with an issue on my 2003 BA turbo manual where the fuel pump relay is not getting a trigger signal from the PCM. The car is tuned with an SCT flash tuner, but this was done years ago, this issue is only recent. 

 

The fuel pump does not get a signal from the PCM to prime or run. Sometimes disconnecting the battery and letting the PCM reset will fix it, sometimes it won't, but eventually it stops working and won't work again until reset. 

 

The fuel pump and all its wiring after the fuse box is fine, the car runs without issue if I bridge out the fuel pump relay with a jumper wire. 

 

I have swapped and tested multiple relays and changed the inertia switch, didn't fix it.

 

The wires between the PCM and the fuel pump relay are fine (<1ohm), and all the PCM pins and connectors look fine, so I'm convinced the PCM isn't opening the ground signal to open the fuel pump relay (it does have 12v on the coil side). 

 

When it happens it throws code P0230 fuel pump relay primary circuit malfinction. 

 

Has anyone encountered this before and has any idea where to look next? Is my PCM dead?

 

Any advice is appreciated, thanks

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Hi guys from PCMTEC, I these days sold a BA Xr6 turbo with a BTR, for the reason that I offered it I actually have had issues with the car stalling, it could occur at any circumstance however commonly as slower speeds, it's going to absolutely flip off the engine, at a few times it's going to simply stop accelerating, I can step at the throttle and not anything will manifest, however once in a while it will come lower back again, however at other instances I may not be capable of carry the revs up and it stall and stop completely. At times simply after it has stalled I will now not be able to crank the engine, it'll take a few attempts until the engine cranks and it starts over. I even have get admission to to ford IDS device and once I connect the automobile I get a distinct VIN variety than what my vehicle have and I can see that the bolts at the PCM were reduce, so the PCM has been modified at some stage. I even have already changed the o2 sensor, the crank attitude sensor without a achievement at all. Someone advised me that solenoid S7 inside the trans could be defective which controls the torque converter snatch, making it interact at random conditions, what could provide an explanation for the stalling and the no cranking. So I replaced the transmission, this made the automobile run exceptional for per week, but today it stalled again but I became capable of crank it right away. Please if a person have idea or facts approximately this I could extraordinarily recognize any assist.

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  • Member For: 4y 3m 2d

You will need to run Forscan 2.4, Run a KOEO and KOER Test, then check for fault codes and then data log items such as the 02 sensor to ensure it is switching, fuel trims, cam timing at idle, Check your power steering switch is operational, Check engine for air leaks using PID's IACTRIM & IACKAM3, Check fuel pressure and AFR, these are the basic starting points before changing parts

 

On 01/03/2024 at 9:01 PM, mc03 said:

I'm dealing with an issue on my 2003 BA turbo manual where the fuel pump relay is not getting a trigger signal from the PCM. The car is tuned with an SCT flash tuner, but this was done years ago, this issue is only recent. 

 

The fuel pump does not get a signal from the PCM to prime or run. Sometimes disconnecting the battery and letting the PCM reset will fix it, sometimes it won't, but eventually it stops working and won't work again until reset. 

 

The fuel pump and all its wiring after the fuse box is fine, the car runs without issue if I bridge out the fuel pump relay with a jumper wire. 

 

I have swapped and tested multiple relays and changed the inertia switch, didn't fix it.

 

The wires between the PCM and the fuel pump relay are fine (<1ohm), and all the PCM pins and connectors look fine, so I'm convinced the PCM isn't opening the ground signal to open the fuel pump relay (it does have 12v on the coil side). 

 

When it happens it throws code P0230 fuel pump relay primary circuit malfinction. 

 

Has anyone encountered this before and has any idea where to look next? Is my PCM dead?

 

Any advice is appreciated, thanks

If it runs fine with a jumper wire then the problem should be the relay / relays your using !

Please post your solution !

Edited by BarraT
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Thanks for these suggestions, however the issue is that the car won't even start. I will run the KOEO tests though when it happens next.

I don't think its the relay. I have tested and swapped multiple relays and know they are ok. When the issue occurs, the relay is not getting the ground signal from the PCM to open. I have confirmed this with a multimeter. Its either the PCM itself, or some other fault that is causing a fuel pump lockout in the PCM.

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  • Member For: 4y 3m 2d

Have you pulled the Pump ? It could be shorting out

 

Trace all the wiring back and check the connections at the pcm

Check the fuse holder pins and the wiring under the relay box in the engine bay

Check all the fuses under the dash

 

P202.jpg

 

p020.jpg

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