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.
DW8 CHECK FOR FUEL SELECTION CONCERNS
• Verify with the customer that flex fuel is not being used on a non-flex fuel vehicle.
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. | GO to DW9 . |
DW9 CHECK THE HO2S CIRCUITS FOR AN OPEN
Note: Check both halves the HO2S connector for any water contamination.
• Ignition OFF.
• PCM connector disconnected.
• For HO2S11,
• HO2S11 connector disconnected.
• Measure the resistance between:
( + ) HO2S11 Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HO2S11 | HO2S11 |
SIGRTN | SIGRTN |
• For HO2S12,
• HO2S12 connector disconnected.
• Measure the resistance between:
( + ) HO2S12 Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HO2S12 | HO2S12 |
SIGRTN | SIGRTN |
• For HO2S22,
• HO2S22 connector disconnected.
• Measure the resistance between:
( + ) HO2S22 Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HO2S22 | HO2S22 |
SIGRTN | SIGRTN |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to DW10 . |
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.