Car was throwing these codes U1000, U1001, p2101, p2100, p1290, p1233. It would shut down when coming to a stop.


I checked the ECU connectors, checked all the fuses and drove around for a couple of miles and the car stopped. Would crank but no start.


Was throwing the same codes, all fuses good. Noticed fuel pump not running. Took it out and it works with 12v. No voltage in the fuel pump connector.


Replaced the fuel relay in the driver footwell fuse box. Nothing.


The throttle bodies were opening earlier when trying to start but now they don't move at all.


I replaced the driver-side fusebox, replaced the IPDM , replaced the throttle bodies and the MAFs (all used parts from a running car).


No difference. Fuel relay is turning on (scanner) but pump is not getting any juice, and the throttles are not opening.


After a code reset the first codes to come back are p1290 and p1233. Related to the electronic throttle control motor bank 2.


The engine sounds healthy and was running just fine before.


What else can I try?

 

Anything?

 

There is no fuel pump relay in the driver-side fuse block. The fuel pump relay is integral to the IPDM/er and is not user-serviceable so I do not know what you replaced. Being that you already replaced the IPDM/er, the issue then goes to the ECM, the FPCM, or related wiring.

Did you check the fuel pump control module (FPCM)? (ONLY APPLIES TO Q-cars)
Did you test the fuel pump wiring connector for continuity?
Did you check ALL of the fuses: IPDM/er, battery fusible links, etc.?

If you have not already, go here, navigate to your specific car, and download the EC (Engine Control) section of the factory manual. This will show you, in detail, what to check and how. It will also point out what fuses are specific to the fuel pump.

EDITED TO ADD: Disregard any reference to the FPCM. This module does not apply to the G37 as it was introduced on the 2014 Q50+ models (the "re-badged" G37 models).

 

I did check all the fuses. They're all good.

Where is the FCPM and the other end of the wiring harness for the pump?

 

Disregard the reference to the FPCM. That does not apply to the G37's as it was introduced in the 2014 Q50. So, my apologies for that confusion/ reference.

That said, everything you need is in the manual referenced above. If you verified the pump works outside of the car with 12V applied, then the issue lies with either the harness or the IPDM/er. Unless the TB codes are preventing the ECU from triggering the fuel pump relay...

Foot OFF brake pedal, turn key from OFF to ON: The pump should run for ≈1sec. to prime the fuel system. Is this happening?

What year is your Coupe? Any new codes or just the P1290/ P1233? The U1000 and U1001 are red flags.

 

It happened to me last year, no power going to fuel pump.I just provided separate power to the fuel pump by adding a 12 volts relay
and ran a trigger line and always on power line. Problem solved.

 

I replaced the IPDM with a used working unit.
I tested continuity between the IPDM and the ECU, and don't seem to get anything.

Providing external 12v to the fuel pump and it started up and everything looked good. I think there's a short in the harness between the IPDM and the ECU.

 

This would be a solution if nothing else works. Thanks