DZ: Universal Heated Oxygen Sensor (HO2S) DZ: Introduction — 2016 workshop reference 5091

Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.

DZ9 CHECK THE UO2SHTR CIRCUIT FOR A SHORT

Note: This pinpoint test is designed to diagnose multiple circuits in the same test steps, only measure the circuits that apply to the vehicle being diagnosed.

• Measure the resistance between:

( + ) Universal HO2S Connector, Harness Side	( - )
UO2SHTR	Ground

• Measure the resistance between:

( + ) Universal HO2S Connector, Harness Side	( - ) Universal HO2S Connector, Harness Side
UO2SHTR	UO2S
UO2SHTR	UO2SGREF
UO2SHTR	UO2SPC
UO2SHTR	UO2SPCT
UO2SHTR	VPWR

Are the resistances greater than 10K ohms?

Yes	No
GO to DZ10 .	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DZ10 CHECK THE INTERNAL RESISTANCE OF THE UNIVERSAL HO2S HEATER

• Measure the resistance between:

( + ) Universal HO2S Connector, Component Side	( - ) Universal HO2S Connector, Component Side
VPWR	UO2SHTR

( + ) Universal HO2S Connector, Component

Side

( - ) Universal HO2S Connector, Component

Side

VPWR

UO2SHTR

Is the resistance between 1.8 - 6 ohms?

Yes	No
GO to DZ11 .	INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test.

Yes

GO to DZ11 .

INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls.

RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM).

REPEAT the self-test.

Source reference 5091

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.