No voltage at fuel pressure sensor

[Mike7979]

Thanks in advance for any help.

I have a 2007 gmc sierra 5.3l 4x4 sle.

I'm getting no voltage at the fuel pressure sensor. Im getting code p069e from the ecm/ecu and codes p0641 and p06a6 from the fscm. I've tested the wires to fuel pressure sensor for conductivity all good there. Tested the reference circuits at the fscm and have no voltage on pins 6-7. Also tested those wires for conductivity, all good. I've cleaned all the grounds. Basically chasing my tail. Possibly ecm/ecu? Any ideas or suggestions more then welcome.

Thanks for you're help/time

Edited October 8, 2021 by Mike7979

[Mike7979]

 

[swathdiver]

5 hours ago, Mike7979 said:

Thanks in advance for any help.

I have a 2007 gmc sierra 5.3l 4x4 sle.

I'm getting no voltage at the fuel pressure sensor. Im getting code p069e from the ecm/ecu and codes p0641 and p06a6 from the fscm. I've tested the wires to fuel pressure sensor for conductivity all good there. Tested the reference circuits at the fscm and have no voltage on pins 6-7. Also tested those wires for conductivity, all good. I've cleaned all the grounds. Basically chasing my tail. Possibly ecm/ecu? Any ideas or suggestions more then welcome.

Thanks for you're help/time

It's either the fuel pressure sensor or the Fuel Pump Control Module, if you have one.  I have seen several 2007s that the fuel pump was controlled by the ECM and there was no separate module to view with the Tech-2.

 

From the shop manual:

 

Circuit/System Testing
 

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ().
2. Ignition ON, verify the scan tool hood position parameter displays Open.

¤	If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions) for DTC P254F.

3. Ignition OFF, disconnect harness connector of the fuel pressure sensor.
4. Ignition OFF, test for less than 1.0 ohm between the low reference circuit terminal 2 and ground.

¤	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the FPCM.

5. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.

¤	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM.
¤	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the FPCM.

6. If all circuits test normal, replace the fuel pressure sensor.

[Mike7979]

Thx I’ll give that a go today see what happens. I have replaced fuel pump assembly as well as fuel pressure sensor.