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.
Clear the PCM DTCs. REPEAT the self-test.
KD9 COMPARE THE ACTUAL MAP VOLTAGE TO THE MAP PID VOLTAGE
• Ignition OFF.
• PCM connector connected.
• Ignition ON, engine OFF.
• Access the PCM and monitor the MAP (VOLT) PID.
• Record the MAP PID voltage.
• Ignition ON, engine running.
• Record the MAP PID voltage.
• Increase engine speed to 1,000 RPM.
• Record the MAP PID voltage.
• Increase engine speed to 2,000 RPM.
• Record the MAP PID voltage.
Does the MAP PID voltage stay within 0.5 V of the actual MAP voltage?
Yes | No |
|---|---|
The concern is not present at this time. Make sure the MAP sensor is correctly seated and the vacuum source is not blocked. Clear the PCM DTCs. REPEAT the self-test. | GO to KD10 . |
KD10 CARRY OUT THE KOER SELF-TEST
• Carry out the PCM KOER self-test.
Is DTC P1408 retrieved again?
Yes | No |
|---|---|
INSTALL a new EEGR assembly. REFER to the Workshop Manual Section 303- 08, Engine Emission Control. Clear the PCM DTCs. REPEAT the self-test. | REFER to Section 3, Symptom Charts, No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index, to continue diagnosis. |
KD11 CHECK FOR CORRECT PCM OPERATION
• Disconnect all the PCM connectors.
• Visually inspect for:
◾ pushed out pins ◾ corrosion
• Connect all the PCM connectors and make sure they seat correctly.
• Carry out the PCM self-test.
• Verify the concern is still present.
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.