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.
APPVREF2 | APPRTN2 |
APPVREF1 | APPRTN2 |
APPVREF2 | APPRTN1 |
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) |
|---|---|
ETCREF | Ground |
APPVREF1 | Ground |
APPVREF2 | Ground |
• For VREF concerns.
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
VREF | SIGRTN |
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) |
|---|---|
VREF | Ground |
Are the resistances greater than 10K ohms?
Yes | No |
|---|---|
GO to C6 . | REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. |
C6 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO VPWR
• For ETCREF concerns.
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
ETCREF | VPWR |
• For APPVREF concerns.
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
APPVREF1 | VPWR |
APPVREF2 | VPWR |
• For VREF concerns.
• Measure the resistance between:
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.