EM: Emission Compliance EM: Introduction — 2016 workshop reference 5108

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.

• Measure the surface temperature at both the inlet and outlet of each catalytic converter.

• Compare the difference in temperature between the inlet and outlet readings of each catalytic converter.

Does each catalytic converter have a difference of more than 28°C (50°F) between its inlet and outlet reading?

Yes	No
The catalytic converter is operating correctly. CONNECT the spark plug wires. CLEAR the DTCs. VERIFY the test step results. If all test steps are OK, GO to Pinpoint Test Z . For additional symptoms, RETURN to Section 3 , Symptoms Charts for further direction. After any repair, GO to EM26 .	For catalytic converters that have less than 28°C (50°F) difference, testing indicates the catalytic converter is not working. REPEAT the test to verify the results. If the temperature difference is still less than required, INSTALL a new catalytic converter. After any repair, GO to EM26 .

Yes

The catalytic converter is operating correctly.

CONNECT the spark plug wires.

CLEAR the DTCs.

VERIFY the test step results.

If all test steps are OK,

GO to Pinpoint Test Z .

For additional symptoms, RETURN to Section 3 , Symptoms Charts for further direction.

After any repair,

GO to EM26 .

For catalytic converters that have less than 28°C (50°F) difference, testing indicates the catalytic converter is not working. REPEAT the test to verify the results. If the temperature difference is still less than required, INSTALL a new catalytic converter.

After any repair,

GO to EM26 .

Source reference 5108

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.