F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
A1 (Continued)-A2
Test B: DTCs B1317 and B1318 - Battery Voltage High/Low
Pinpoint Test B: DTCs B1317 and B1318 Battery Voltage High/Low
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 braking energy that is provided to the trailer from the trailer brake control (TBC) module is varied with a pulse width modulated (PWM) signal
that switches between 0 volt and battery voltage, the higher the duty cycle the more braking power available. For normal operation, the fused battery
supply to the TBC module must be between 9 and 16 volts. If the voltage falls below or goes above these parameters, the appropriate DTC will be set.
The TBC module receives fused battery voltage from battery junction box (BJB) fuse 5 (30A) along circuit SBB05 (GY/RD) and fused ignition
voltage from smart junction box (SJB) fuse 33 (10A) along circuit CBP33 (WH/BN). The ground path for the TBC module is along circuit GD115
(BK/GY).
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B1317 Battery Voltage High - If the battery voltage is greater than 16 volts for 200 ms or longer, the TBC module shuts off trailer brake output
and then shuts down.
^
B1318 Battery Voltage Low - If the battery voltage is less than 9 volts for 200 ms or longer, the TBC module shuts off trailer brake output and
then shuts down.
This pinpoint test is intended to diagnose the following:
^
Fuse(s)
^
Wiring, terminals or connectors
^
Vehicle battery
^
Vehicle charging system
^
TBC module
