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.
C: Reference Voltage (VREF)
C: Introduction
C1 CHECK THE REFERENCE VOLTAGE TO SIGNAL RETURN
Note: Diagnostic trouble codes (DTCs) P0642, P0643, P06A6, P06A7 and P06A8 are set due to VREF circuit concerns only. DTCs P0652 and P0653 are set due to ETCREF circuit concerns only. When diagnosing DTC P0642, P0643, P06A6, P06A7 or P06A8, follow the path for VREF concerns. When diagnosing DTC P0652 or P0653, follow the path for ETCREF concerns.
• Ignition OFF.
• Suspect Sensor connector disconnected.
• Ignition ON, engine OFF.
• For ETCREF concerns.
• Measure the voltage between:
( + ) ETBTPS Connector, Harness Side | ( - ) ETBTPS Connector, Harness Side |
|---|---|
ETCREF | ETCRTN |
• For APPVREF concerns.
• Measure the voltage between:
( + ) APP Sensor Connector, Harness Side | ( - ) APP Sensor Connector, Harness Side |
|---|---|
APPVREF1 | APPRTN1 |
APPVREF2 | APPRTN2 |
• For VREF concerns.
• Measure the voltage between:
( + ) Suspect Sensor Connector, Harness Side | ( - ) Suspect Sensor Connector, Harness Side |
|---|---|
VREF | SIGRTN |
Is the voltage between 4.5 - 5.5 V?
Yes | No |
|---|---|
GO to C31 . | GO to C2 . |
C2 CHECK THE REFERENCE VOLTAGE TO GROUND
• For ETCREF concerns.
• Measure the voltage 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.