Pinpoint Test DZ: Universal Heated Oxygen Sensor (HO2S): Introduction
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
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:
- universal HO2S (9Y460)
- harness circuits: UO2S, UO2SGREF, UO2SHTR, UO2SPC, UO2SPCT, and VPWR
- powertrain control module (PCM) (12A650)
UNIVERSAL HO2S-FRONT CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 5 | UO2SPCT (Universal Oxygen Sensor Pumping Current Trim) |
| 1 | UO2SPC (Universal Oxygen Sensor Pumping Current) |
| 4 | VPWR (Vehicle Power) |
| 2 | UO2SGREF (Universal Oxygen Sensor Ground Reference) |
| 6 | UO2S (Universal Oxygen Sensor) |
| 3 | UO2SHTR (Universal Oxygen Sensor Heater) |
PCM CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| E11 | UO2SPCT (Universal Oxygen Sensor Pumping Current Trim) |
| E23 | UO2SPC (Universal Oxygen Sensor Pumping Current) |
| E52 | UO2SHTR (Universal Oxygen Sensor Heater) |
| E26 | UO2SGREF (Universal Oxygen Sensor Ground Reference) |
| E38 | UO2S (Universal Oxygen Sensor) |