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.
For all others, GO to Pinpoint Test Z .
DR4 CHECK THE GENERATOR FOR EXCESSIVE ELECTRICAL NOISE
Note: If the generator/regulator is electrically noisy, the noise decreases when the B+ connector is disconnected.
• Ignition ON, engine running.
• Monitor the generator for an audible electric noise.
• Ignition OFF.
• Generator/regulator B+ connector disconnected.
• Ignition ON, engine running.
• With the engine running, determine if the generator noise remains steady, decreases or increases in volume.
Does the generator noise remain steady when the B+ connector is disconnected?
Yes | No |
|---|---|
GO to DR5 . | REFER to the Workshop Manual Section 414- 00, Charging System, to DIAGNOSE the generator is noisy symptom. |
DR5 CHECK THE VOLTAGE TO THE CMP SENSOR
Note: Diagnose the suspect CMP sensor indicated by the DTC. For 2 pin VR type CMP sensor DTCs, GO to DR6 .
• Generator/regulator B+ connector connected.
• CMP Sensor connector disconnected.
• Ignition ON, engine OFF.
• For VBPWR CMP sensors,
• Measure the voltage between:
( + ) CMP Sensor Connector, Harness Side | ( - ) |
|---|---|
VBPWR | Ground |
• For VREF CMP sensors,
• Measure the voltage between:
( + ) CMP Sensor Connector, Harness Side | ( - ) CMP Sensor Connector, Harness Side |
|---|---|
VREF | SIGRTN |
Is the voltage greater than 10.5 V on the VBPWR circuit or between 4.5 and 5.5 V on the VREF circuit?
Yes | No |
|---|---|
GO to DR7 . | For EcoSport, |
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.