Pinpoint Tests H: Fuel Control: Introduction

WARNING: TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE HYBRID SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

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:

heated oxygen sensor(s) (HO2S)
fuel injector(s) (9F593)
vacuum system
harness circuits: HO2S11, HO2S12, HTR11, HTR12, UO2SPC, SIGRTN, and VPWR
powertrain control module (PCM) (12A650)

Fig 1: Identifying Heated Oxygen Sensor-Rear (HO2S-Rear) Connector
Courtesy of FORD MOTOR CO.

Fig 2: Identifying Universal HO2S-Front Connector

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.