Pinpoint Test H: Fuel Control: Introduction
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 |