Pinpoint Test AE: DTC U0140 Or DTC U0140:00
Information and Entertainment System
Pinpoint Tests
Pinpoint Test AE: DTC U0140 Or DTC U0140:00
Refer to Wiring Diagram Set 130 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
Several audio system modules receive network messages from the Smart Junction Box (SJB) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages:
- Ignition switch position
- Illumination dimmer control
- Accessory delay status
As more than one module receives these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.
- DTC U0140 (Lost Communication With Body Control Module (GEM)) - set by the non-navigation (Fusion,
Milan) Audio Control Module (ACM), the Front Controls Interface Module (FCIM) (Fusion, Milan), or the Front Display Interface Module (FDIM) when network messages are missing from the SJB for greater than 5 seconds with the ignition in RUN.
- DTC U0140:00 (Lost Communication With Body Control Module: No Sub Type Information) - set by the non-navigation (MKZ) or navigation (all) ACM, the audio Digital Signal Processing (DSP) module, the Accessory Protocol Interface Module (APIM), the Global Positioning System Module (GPSM), or the FCIM (MKZ) when network messages are missing from the SJB for greater than 5 seconds with the ignition in RUN.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- Audio system concern
- SJB
PINPOINT TEST AE: DTC U0140 OR DTC U0140:00
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AE1 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0140 or DTC U0140:00 set in any audio system module?
Yes
GO to AE2.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
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AE2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM
- Audio DSP module (if equipped)
- APIM (if equipped)
- FCIM
- FDIM
- GPSM (if equipped)
- SJB
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
Yes
For an audio system module, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
For the SJB, REFER to Body Control Systems.
No
GO to AE3.
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AE3 CHECK FOR DTC U0140 OR DTC U0140:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0140 or DTC U0140:00 set in more than one audio system module?
Yes
GO to AE4.
No
If there is an observable symptom, GO to Symptom Chart - General Audio System to diagnose the observed symptom. Symptom Chart - General Audio System
If there is no observable symptom, CHECK the MS-CAN wiring between the SJB and the module in question for an intermittent fault.
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AE4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Is the concern still present?
Yes
INSTALL a new SJB. REFER to Body Control Systems. CLEAR all continuous DTCs. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test for the module(s) that set DTC U0140 or DTC U0140:00.
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