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.
H24 CHECK THE UNIVERSAL HO2S ACTIVITY
• Universal HO2S connector connected.
• Ignition ON, engine running.
• Access the PCM and monitor the FUELSYS (MODE) PID.
• Allow the engine to enter closed loop fuel control.
• Access the PCM and monitor the O2S11_CUR (CUR) and O2S21_CUR (CUR) PIDs.
Does the O2S11_CUR or O2S21_CUR PID value switch?
Yes | No |
|---|---|
Unable to duplicate or identify the concern at this time. GO to Pinpoint Test Z . | 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. |
H25 CHECK FOR KOER DTCS
• Ignition ON, engine OFF.
• Clear the PCM DTCs.
• Ignition ON, engine running.
• Run the engine at approximately 2,000 RPM. Maintain the engine speed for 3 minutes.
• Carry out the PCM self-test.
Are DTCs P2270, P2271, P2272 or P2273 present?
Yes | No |
|---|---|
GO to H26 . | Unable to duplicate or identify the concern at this time. GO to Pinpoint Test Z . |
H26 CHECK FOR SHORTS BETWEEN CIRCUITS IN THE HO2S HARNESS
Note: Diagnose the suspect sensor indicated by the DTC.
• PCM connector disconnected.
• For HO2S12,
• HO2S12 connector disconnected.
• Measure the resistance between:
( + ) HO2S12 Connector, Harness Side | ( - ) |
|---|---|
HO2S12 | Ground |
• Measure the resistance between:
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.