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.
VPWR | VPWR |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to H28 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
H28 CHECK THE HO2S CIRCUIT FOR A SHORT TO VOLTAGE
• Ignition ON, engine OFF.
• For HO2S12,
• Measure the voltage between:
( + ) HO2S12 Connector, Harness Side | ( - ) |
|---|---|
HO2S12 | Ground |
SIGRTN | Ground |
• For HO2S22,
• Measure the voltage between:
( + ) HO2S22 Connector, Harness Side | ( - ) |
|---|---|
HO2S22 | Ground |
SIGRTN | Ground |
Is any voltage present?
Yes | No |
|---|---|
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. | GO to H29 . |
H29 CHECK THE HO2S OUTPUT VOLTAGE
• PCM connector connected.
• For HO2S12,
• HO2S12 connector connected.
• Ignition ON, engine running.
• Allow the engine to idle for 2 minutes.
• Access the PCM and monitor the O2S12 (VOLT) PID.
• Record the HO2S PID value.
• For HO2S22,
• HO2S22 connector connected.
• Ignition ON, engine running.
• Allow the engine to idle for 2 minutes.
• Access the PCM and monitor the O2S22 (VOLT) PID.
• Record the HO2S PID value.
Is the PID voltage less than 1.1 V (E-Series 5.4L, Escape/Kuga 1.6L, Fiesta TiVCT 1.6L, Fiesta 1.6L GTDI, Transit Connect 1.6L) or less than 1.6 V (all others)?
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.