F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Test C: DTCs C2803 - Brake Pressure Transducer Sense Circuit Failure
Pinpoint Test C: DTCs C2803 - Brake Pressure Transducer Sense Circuit Failure
NOTE: Carry out all pinpoint tests without a trailer connected to the vehicle.
Refer to Vehicle/Diagrams, Trailer/Camper Adapter for schematic and connector information.
Normal Operation
The brake pressure transducer is attached to the brake master cylinder and is hardwired to the trailer brake control (TBC) module. The transducer and the
master cylinder are installed new as an assembly. The TBC module also receives information from the brake pressure switch (BPS) (also called the speed
control deactivation switch) and the brake on/off (BOO) switch from the PCM over the high speed communication area network (HS-CAN) bus. All 3
switches provide the TBC with the current vehicle braking information. The BPS and the BOO are also used to determine if the transducer is functioning
correctly.
The TBC module supplies voltage to the transducer along circuit LCA16 (GN) and ground along circuit RCA16 (BU/BN). The voltage returned from the
transducer along circuit VCA13 (YE/BU) is used by the TBC module to determine current brake pressure.
DTC C2803 Brake Pressure Transducer Sense Circuit Failure - If the TBC module detects brake pressure, with no BOO switch input or BPS input for
200 ms or more, the TBC module will no longer use the pressure transducer input. The TBC module will also set DTC C2803, send TBC FAULT to the
message center (if equipped) and revert to a limited operating strategy.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Brake pressure transducer
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Brake on/off switch
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Brake pressure switch
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TBC module
C1
