Pinpoint Test DW: Heated Oxygen Sensor (Ho2S): 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:

exhaust leaks
HO2S (9G444)
harness circuits: HO2S11, HO2S12, HO2S22, HTR12, HTR22, VPWR and SIGRTN
PCM (12A650)

Fig 1: Heated Oxygen Sensor Bank 1, Sensor 2 (HO2S12) Connector - Pin Numbering For Connector

Courtesy of FORD MOTOR CO.

Harness Side

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

Fig 2: Powertrain Control Module (PCM) Connector - For PCM Connector Views

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
HO2S12 (Heated Oxygen Sensor Bank 1, Sensor 2)	E26
SIGRTN (Signal Return)	E13
HTR12 (Heater Oxygen Sensor Bank 1, Sensor 2)	E81