F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
F4 (Continued)-F5
Test G: DTCs C2797 or C2798 - Brake Pressure Transducer Supply Short to Battery or Ground
Pinpoint Test G: DTCs C2797 or C2798 Brake Pressure Transducer Supply Short to Battery or Ground
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 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.
C2797 Brake Pressure Transducer Supply Short to Battery With the ignition switch in the RUN position, if the TBC detects more than 5.5 volts on
circuit LCA16 (GN) for 200 ms or more, the TBC module will no longer use the pressure transducer input. The TBC module will also set DTC C2797,
send TBC FAULT to the message center (if equipped) and revert to a limited operating strategy.
C2798 Brake Pressure Transducer Supply Short to Ground - With the ignition switch in the RUN position, if the TBC detects less than 4.5 volts on
circuit LCA16 (GN) for 200 ms or more, the TBC module will no longer use the pressure transducer input. The TBC module will also set DTC C2798,
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:
^
Wiring, terminals or connectors
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Brake pressure transducer
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TBC module
