Pinpoint Test B: Radio Interference

High-Voltage Traction Battery

Pinpoint Tests

Pinpoint Test B: Radio Interference

Refer to Wiring Diagram Set 12 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Charging System for schematic and connector information. Diagrams By Number

Normal Operation

With the engine running and the audio unit ON (the audio unit MUST be OEM), there should be minimal interference audible from the speakers (compare to a similar vehicle).

This pinpoint test is intended to diagnose the following:
- Audio unit
- Generator (part of the Electronically Controlled Continuously Variable Transmission (eCVT)])
- DC/DC converter


PINPOINT TEST B: RADIO INTERFERENCE

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B1 VERIFY THE DC/DC CONVERTER IS THE SOURCE OF THE RADIO INTERFERENCE

- Ignition OFF.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
- With the engine running, command the PCM active command DC to DC Converter Enable (DCE) PID to OFF.
- Is interference present with the DCE PID OFF?

Yes
INSTALL a new DC/DC converter. REFER to High Voltage Converter/Inverter Direct Current/Direct Current (DC/DC) Converter. TEST the system for normal operation.

No
GO to B2.

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B2 VERIFY THE GENERATOR IS THE SOURCE OF THE RADIO INTERFERENCE

- Ignition In ACC.
- With the ignition switch in the ACC position, note any audio interference.
- Is the interference present with the ignition switch in the ACC position?

Yes
REFER to Information and Entertainment Systems Testing and Inspection to continue diagnosis of the audio system.

No
INSTALL a new eCVT. REFER to Automatic Transaxle/Transmission - Electronically Controlled Continuously Variable Transmission (eCVT) Removal and Replacement. TEST the system for normal operation.

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