Pinpoint Test A: DTC B1483
Anti-Lock Control - Non-Hybrid
Pinpoint Test A: DTC B1483
Refer to Wiring Diagram Set 42 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
When the brake pedal is pressed, the Brake Pedal Position (BPP) switch opens, this interrupts a voltage signal that is sent to the PCM. When the PCM detects this interruption, it sends a message over the High Speed Controller Area Network (HS-CAN) bus indicating that the brake pedal has been pressed. The PCM uses the BPP switch information for the speed control system. The ABS module receives the BPP switch information from the PCM over the HS-CAN bus.
The BPP is also known as the stoplamp switch.
- DTC B1483 (Brake Pedal Input Open Circuit) - The ABS module compares the BPP message against other inputs (brake pressure and wheel speed) and if the message does not match the other inputs and there are no DTCs present for those inputs, DTC B1483 is set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- BPP switch
- PCM
- ABS module
PINPOINT TEST A: DTC B1483
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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A1 CHECK THE ABS MODULE DTCs
- Review the DTCs recorded during Inspection and Verification.
- Were any wheel speed sensor DTCs retrieved?
Yes
For DTC C1145, C1155, C1165 or C1175, GO to Pinpoint Test C. Pinpoint Test C: DTCs C1145, C1155, C1165 and C1175
For DTC C1233, C1234, C1235 or C1236, GO to Pinpoint Test D. Pinpoint Test D: DTCs C1233, C1234, C1235 and C1236
No
GO to A2.
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A2 CHECK FOR PCM DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: KOEO Self Test - PCM.
- Retrieve and record any PCM DTCs.
- Are any DTCs present in the PCM?
Yes
REFER to the Diagnostic Trouble Code (DTC) Chart in Multifunction Electronic Modules Testing and Inspection.
No
GO to A3.
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A3 CHECK THE ABS MODULE DTCs
- Review the DTCs recorded during Inspection and Verification.
- Are DTCs U0100 and/or U0401 also present?
Yes
DIAGNOSE DTCs U0100 and/or U0401 before diagnosing B1483. REFER to the ABS Module DTC Chart. ABS Module DTC Chart
No
If DTCs C1288 and/or C1440 are present, GO to Pinpoint Test I. Pinpoint Test I: DTCs C1288 and C1440
If no other DTCs are present, GO to A4.
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A4 CHECK THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
- Monitor the BOO_ABS PID while pressing and releasing the brake pedal.
- Does the PID agree with the pedal position?
Yes
The system is operating correctly at this time. CLEAR the DTC. REPEAT the self-test.
No
GO to A5.
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A5 CHECK THE PCM BOO1 PID
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
- Monitor the BOO1 PID while pressing and releasing the brake pedal.
- Does the PID agree with the pedal position?
Yes
REFER to Module Communications Network Testing and Inspection to diagnose the communication concern.
No
REFER to Cruise Control Testing and Inspection and diagnose the speed control deactivation switch.
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