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.
EM: Emission Compliance
EM: Introduction
EM1 ANALYZE THE I/M TEST REPORT
• Analyze the I/M test report for data entry errors.
◾ model ◾ model year ◾ correct calibration, if included on the report ◾ correct test weight, if included on the report (this number is less than the vehicle's GVW)
• Analyze the I/M test report results.
◾ identify high and low gas readings. ◾ for reports that include a drive cycle, identify during which mode the gases failed. Be aware
that if all gases were high early then decreased, the catalyst may have been cool when testing began.
Has the I/M test report been analyzed?
Yes | No |
|---|---|
GO to EM2 . | REPEAT the test step. |
EM2 EVAP SYSTEM LEAK OR PURGE FLOW TEST (IF THESE TESTS WERE CARRIED OUT)
Does the vehicle fail only an EVAP system leak or purge flow test (if these tests are carried out)?
Yes | No |
|---|---|
This is an EVAP concern only. GO to EM22 . | GO to EM3 . |
EM3 BASELINE THE VEHICLE
Note: Baselining the vehicle exhaust gas readings is important so the baseline readings can be used for comparison after any repair is made.
• Baseline the vehicle using an exhaust gas analyzer. If the vehicle must be driven, be certain any baseline drive used is repeatable. The same drive cycle will be used to verify any repair.
• During the baseline, check for any related symptoms that may be present, such as driveability, transmission shifting or exhaust smoke concerns.
Has the vehicle been baselined?
Yes | No |
|---|---|
GO to EM4 . | REPEAT the test step. |
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.