Pinpoint Test O: DTC B1143 - Excessive Battery Contactor Close Requests
High-Voltage Traction Battery
Pinpoint Tests
Pinpoint Test O: DTC B1143 - Excessive Battery Contactor Close Requests
Refer to Wiring Diagram Set 12 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Charging System for schematic and connector information. Diagrams By Number
Normal Operation
When the key is turned to the ON position, the PCM sends a request to the Battery Control Module (BCM) over the Controller Area Network (CAN) communication link to close the High Voltage Traction Battery (HVTB) contactors.
- DTC B1143 Excessive Battery Contactor Close Requests - If the PCM sends 100 requests in 4 minutes (or less) requests to close the HVTB contactors the BCM will set this DTC.
This pinpoint test is intended to diagnose the following:
- Rapid key cycling/excessive contactor close requests
- CAN communication link
- PCM
- BCM
- Real-time clock
PINPOINT TEST O: DTC B1143 - EXCESSIVE BATTERY CONTACTOR CLOSE REQUESTS
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O1 CHECK FOR RAPID KEY CYCLING
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.
NOTE: On Demand DTCs may not yield the DTC B1143. Continuous memory DTCs must be retrieved to verify that DTC B1143 is not present.
- Ignition OFF.
- Connect the scan tool.
- Ignition ON.
- Clear the BCM DTCs from the continuous and on-demand self tests.
- Ignition OFF.
- Ignition ON.
- Wait 5 minutes.
- Enter the following diagnostic mode on the scan tool: Retrieve BCM DTCs again, making certain to retrieve on-demand DTCs and continuous memory DTCs.
- Is DTC B1143 still present?
Yes
GO to O2.
No
RETURN the vehicle to the customer. The concern may have been caused by rapid key cycling.
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O2 CHECK THE CAN COMMUNICATION LINK
- Check the recorded BCM DTCs from the continuous and on-demand self tests.
- Are any CAN communication link DTCs (Uxxx) present?
Yes
REFER to Information Bus to continue diagnosis of the communication network.
No
GO to O3.
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O3 CHECK FOR CORRECT PCM OPERATION
- Disconnect PCM electrical connectors C175b, C175e and C175t.
- Check for:
- corrosion.
- pushed-out pins.
- Connect PCM electrical connectors C175b, C175e and C175t and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new PCM. CLEAR the BCM DTCs. CYCLE the ignition switch to OFF, then
ON and leave ON for 5 minutes. TEST the system for normal operation. If vehicle does not start, GO to O4.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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O4 CHECK FOR CORRECT BCM OPERATION
- Disconnect BCM electrical connector C4227a.
- Check for:
- corrosion.
- pushed-out pins.
- Connect BCM electrical connector C4227a and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new BCM. REFER to High-Voltage Traction Battery High-Voltage Traction Battery. CLEAR the BCM DTCs. CYCLE the ignition to OFF, then ON and leave ON for 5 minutes. 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 the DTCs. REPEAT the self-test. TEST the system for normal operation.
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