Code P0090, fuel pressure regulator open circuit, diagram for this high-pressure pump Volt signals input and output needed?

Tiny
ANDRIN ATEM
  • MEMBER
  • 2015 HYUNDAI SANTA FE
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,050 MILES
Hi, please can you provide me with the diagram for this high-pressure pump volt signals input and output, so I can compare if it’s within specification.

Fault code is P0090.

My current voltage reading is 1.44 on one cable with key on run position.

While the other cable I am getting a voltage of 1.49 with key on the run position. Please help me with the diagram and the signal outputs and inputs.

Sorry it’s All wheel drive.
Monday, December 23rd, 2024 AT 10:30 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
Hi,

Chances are there is a connector issue. At the voltages to the regulator, the first three pics below are specific to the code. They provide what to check and the specifications expected.

Pics 3 and 4, they are from the powertrain management wiring schematic. There should be two wires at the regulator. One high voltage and the other is a low voltage signal. Black is the high, blue is the low.

The second picture below is the pinout from the PCM.

Let me know if this helps or if you have other questions.

Take care and Merry Christmas!

Joe

See pics below.
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Monday, December 23rd, 2024 AT 8:39 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 331 POSTS
Thanks very much for the diagrams.
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Tuesday, December 24th, 2024 AT 3:00 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 331 POSTS
What module is this please? It’s certainly not the ecu. Because I can see the two terminals for the fuel pressure Regulator. I have added the VIN number on the images below.

From the ecu pin out I can see the fuel pressure regulator.
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Tuesday, December 24th, 2024 AT 3:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,732 POSTS
The high-pressure pump regulator goes to the injector driver box. Here is the location. Check out the images (below). Let us know how it goes.
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Thursday, December 26th, 2024 AT 11:44 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 331 POSTS
Please confirm the VIN number if this diagram is for the correct vehicle.
Below I have attached the VIN number for my vehicle.
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Thursday, December 26th, 2024 AT 2:09 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 331 POSTS
Please confirm the VIN number if this diagram is for the correct vehicle.
Below I have attached the vin number for my vehicle.
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Thursday, December 26th, 2024 AT 2:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,732 POSTS
Yep, the information has been confirmed for your vehicle.
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Friday, December 27th, 2024 AT 10:26 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 331 POSTS
Thank you.
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Saturday, December 28th, 2024 AT 1:28 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,732 POSTS
You are welcome, please let us know what happens.
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Saturday, December 28th, 2024 AT 10:14 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 331 POSTS
Thank you, I will.
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Saturday, December 28th, 2024 AT 3:37 PM

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