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.
Original table alignment retained · Scroll horizontally if needed
Is the voltage between 4.5 - 5.5 V?
Yes | No |
|---|---|
GO to C8 . | GO to C4 . |
C4 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
• Ignition OFF.
• PCM connector disconnected.
• For ETCREF concerns.
• Measure the resistance between:
( + ) ETBTPS Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
ETCREF | ETCREF |
• For APPVREF concerns.
• Measure the resistance between:
( + ) APP Sensor Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
APPVREF1 | APPVREF1 |
APPVREF2 | APPVREF2 |
• For VREF concerns.
• Measure the resistance between:
( + ) Suspect Sensor Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
VREF | VREF |
Is the resistance less than 5 ohms?
Yes | No |
|---|---|
GO to C5 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
C5 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO GROUND
• For APPVREF or ETCREF concerns.
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
ETCREF | ETCRTN |
APPVREF1 | APPRTN1 |
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.