Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Tests H: Fuel Control: Introduction
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 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.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Continental, Expedition, Ford GT, Motorhome/Stripped Chassis/Step Van, Navigator | A | 2 1 3 4 |
HTR12 VPWR SIGRTN HO2S12 |
| F-150 2.7L, F-150 3.3L, F-150 5.0L | B | 1 2 3 4 |
HTR12 VPWR SIGRTN HO2S12 |
| Mustang TiVCT 5.2L, Ranger 2.5L | C | 2 1 3 4 |
HTR12 VPWR SIGRTN HO2S12 |
| All other vehicles | A | 1 2 3 4 |
HTR12 VPWR SIGRTN HO2S12 |
Heated Oxygen Sensor Bank 2, Sensor 2 (HO2S22) Connector
The pin numbering for the connector is in reference to the connector lock tab. Not all connector key combinations are shown.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Expedition, Ford GT, Navigator | A | 2 1 3 4 |
HTR22 VPWR SIGRTN HO2S22 |
| F-150 2.7L, F-150 3.3L, F-150 5.0L | B | 1 2 3 4 |
HTR22 VPWR SIGRTN HO2S22 |
| Mustang TiVCT 5.2L | C | 2 1 3 4 |
HTR22 VPWR SIGRTN HO2S22 |
| All other vehicles | A | 1 2 3 4 |
HTR22 VPWR SIGRTN HO2S22 |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Bronco Sport 2.0L, Corsair, Edge 2.0L, Escape/Kuga 2.0L, Escape/Kuga 2.5L, Explorer 2.3L, Explorer 3.3L, F-150 3.3L, F-150 5.0L, Mustang 5.0L, Mustang 5.2L Supercharged, Nautilus 2.0L, Ranger, Transit TiVCT 3.5L, Transit Connect 2.0L, Transit Connect 2.5L |
A | 3 | UO2SPC |
| Mustang TiVCT 5.2L | B | 6 | UO2SPC |
| All other vehicles | C | 1 | UO2SPC |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to Reference Values.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Bronco Sport 1.5L, Escape/Kuga 1.5L, Mustang 2.3L, Ranger 2.3L, Transit Connect 1.0L, Transit Connect 2.0L | 198 PIN | E33 B100, B101, B102 E81 E13 E26 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| Bronco Sport 2.0L | 198 PIN | E33 B100, B101, B102 E26 E55 E81 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| Continental, EcoSport 1.0L Automatic Transmission, | 198 PIN | E63 B101, B102, B103 |
UO2SPC11 |
| EcoSport 2.0L | B1 B38 B57 |
VPWR HTR12 SIGRTN HO2S12 |
|
| Corsair 2.0L, Corsair 2.3L, Escape/Kuga 2.0L | 198 PIN | E33 B100, B101, B102 E26 B55 E81 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| Corsair 2.5L, Escape/Kuga 2.5L, Transit Connect 2.5L | 198 PIN | E6 B97, B99 E92 B71 B72 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| E-Series, F-650/F-750, Motorhome/Stripped Chassis/Step Van | 306 PIN | T30 T29 B1, B16, B2 T77 T84 T10 |
UO2SPC21 UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| EcoSport 1.0L Manual Transmission | 198 PIN | E39 B101, B102, B103 B1 B37 B57 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| EcoSport 1.5L Automatic Transmission, KA 1.5L Automatic Transmission | 198 PIN | B97, B99 E92 B53 B72 |
VPWR HTR12 SIGRTN HO2S12 |
| EcoSport 1.5L Manual Transmission, KA 1.2L, KA 1.5L Manual Transmission | 112 PIN | B55, B56 E49 E1 E14 |
VPWR HTR12 SIGRTN HO2S12 |
| Edge 2.0L, Nautilus 2.0L | 198 PIN | E33 B100, B101, B102 E81 B26 E26 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| Edge 2.7L, Expedition Base, Nautilus 2.7L, Navigator Base | 306 PIN | T30 T29 T16 B28 T26 B1, B16, B2 T77 T84 T10 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
| Expedition High Output, Navigator High Output | 198 PIN | E63 E62 B78 B94 B95 B101, B102, B103 B1 B75 B76 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
| Explorer 2.3L | 198 PIN | E33 B100, B101, B102 E81 B55 E26 |
UO2SPC11 VPWR HTR12 SIGRTN HO2S12 |
| F-150 | 306 PIN | T57 T59 T81 T11 T26 B16, B17, B2 T77 T12 T27 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
| Ford GT | 198 PIN | E61 E63 B61 B37 B56 B101, B102, B103 B1 B38 B57 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
| KA 1.0L | 128 PIN | B36, E24 E36 E8 E19 |
VPWR HTR12 SIGRTN HO2S12 |
| Mustang TiVCT 5.2L | 198 PIN | E35 E36 E83 B90 B91 B1, B16, B2 E78 B71 B72 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
| Ranger 2.5L | 128 PIN | B11, B12 E47 E9 E20 |
VPWR HTR12 SIGRTN HO2S12 |
| Transit GTDI 3.5L | 306 PIN | T30 T29 T16 T85 T26 B101, B102, B103 T77 T84 T10 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
| All other vehicles | 306 PIN | T30 T29 T16 T85 T26 B1, B16, B2 T77 T84 T10 |
UO2SPC21 UO2SPC11 HTR22 SIGRTN HO2S22 VPWR HTR12 SIGRTN HO2S12 |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.