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HOMESERVICE MANUALSFORD2021TRANSIT-350 XL, 3.5L ENG VIN G, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 510 (ENGINE CONTROLS - PINPOINT TEST DO: BAROMETRIC PRESSURE (BARO) SENSOR THROUGH PINPOINT TEST HC: FUEL DELIVERY SYSTEM - (EXCEPT DIESEL & HYBRID))PINPOINT TEST H: FUEL CONTROLINTRODUCTION
2021 Ford Transit-350 XL, 3.5L Eng VIN G, RWD

Pinpoint Test H: Fuel Control: Introduction

2021 Ford Transit-350 XL, 3.5L Eng VIN G, RWDSECTION Introduction
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WARNING: While conducting tests on a hot engine take all safety precautions to prevent skin contact with hot engine components. Failure to follow these instructions may result in personal injury

This pinpoint test is intended to diagnose the following:

  • HO2S (9G444)
  • universal HO2S (9Y460)
  • fuel injectors (9F593)
  • harness circuits: HO2S12, HO2S22, HTR12, HTR22, SIGRTN, UO2SPC and VPWR
  • vacuum systems
  • PCM (12A650)

For additional information on heated oxygen sensor (HO2S), refer to Section 1, Catalyst And Exhaust Systems

Heated Oxygen Sensor Bank 1, Sensor 2 (HO2S12) Connector - The pin numbering for the connector is in reference to the connector lock tab. Not all connector key combinations are shown. 

Harness Side

Circuit Pin
HO2S12 (Heated Oxygen Sensor Bank 1, Sensor 2) 4
SIGRTN (Signal Return) 3
HTR12 (Heater Oxygen Sensor Bank 1, Sensor 2) 1
VPWR (Vehicle Power) 2

Universal HO2S Connector 

Harness Side

Circuit Pin
UO2SPC (Universal Oxygen Sensor Pumping Current) 1

Powertrain Control Module (PCM) Connector - For PCM connector views or reference values, refer to Section 6, Reference Values. 

Harness Side

Circuit Pin
UO2SPC11 (Universal Oxygen Sensor Pumping Current Bank 1, Sensor 1) E33
HO2S12 (Heated Oxygen Sensor Bank 1, Sensor 2) E26
SIGRTN (Signal Return) E13
HTR12 (Heater Oxygen Sensor Bank 1, Sensor 2) E81
VPWR (Vehicle Power) B100
VPWR (Vehicle Power) B102
VPWR (Vehicle Power) B101
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.