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


WARNING: Wear high-voltage insulated safety gloves and a face shield when working with high-voltage batteries or cables. The high-voltage insulated safety gloves should be of the appropriate safety and protection rating. Inspect the gloves before use and always wear them with the leather outer glove. Any hole in the rubber insulating glove is a potential entry point for high-voltage. Failure to follow these instructions may result in serious personal injury or death.

WARNING: Turn OFF the ignition switch for a minimum of 5 minutes before removing high-voltage cables. High-voltage cables and wiring are orange in color. The nominal high-voltage traction battery voltage (HVTB) is 330 V DC. Failure to follow these instructions may result in serious personal injury or death.

WARNING: Depower the high-voltage traction battery (HVTB) before carrying out any removal or installation procedures affecting the high-voltage battery system. Failure to follow this instruction may result in serious personal injury or death.

WARNING: When servicing the high-voltage system, establish a buffer zone per the specified procedure. Failure to follow this instruction may result in serious personal injury or death.

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

Yes
INSTALL a new 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 Radio, Stereo, and Compact Disc to continue diagnosis of the audio system.

No
INSTALL a new eCVT. TEST the system for normal operation.

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