F 350 2WD Super Duty V10-6.8L (2009)
Smart Junction Box (SJB)
Pinpoint Tests
Pinpoint Test A: DTCs B106E, B106F
Normal Operation
The Smart Junction Box (SJB) controls the output of several vehicle systems by means of solid state drivers. When an overload occurs on any of these
drivers, a DTC will be set. The module also tracks the number of repetitive faults on each of these circuits. The module compares this number of
overloads to 3 progressive thresholds established for each circuit. If the 3 thresholds have not been exceeded, then the DTC of the affected circuit can be
cleared by eliminating the fault, then clearing the DTCs and running the self-test. At the point that each of the first 2 thresholds are exceeded, B106E will
be set along with the DTC relating to the affected circuit. Once the final threshold has been exceeded, the affected output is permanently disabled, and
B106F will be set along with B1342, at which time the SJB must be replaced.
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DTC B106E (Solid State Driver Disabled Due To Short Circuit) - sets when the SJB has disabled a circuit due to a repetitive fault causing a circuit
overload. A corresponding DTC for the circuit in question will also set.
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DTC B106F (Module Disabled Due to External Fault) - sets when one or more output functions are permanently disabled due to a repetitive circuit
overload fault. DTC B106F will be set with DTC B1342. When DTC B106F is present, a new SJB must be installed after the fault condition has
been corrected.
This pinpoint test is intended to diagnose the following:
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Output circuit short to ground or voltage
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SJB
PINPOINT TEST A: DTCs B106E, B106F
NOTICE: If DTC B106F is present, the fault condition must be corrected prior to installing a new SJB. Failure to correct the fault condition
first may cause damage to the new SJB, resulting in a repeat repair.
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A1 REVIEW THE DTCs
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Review the DTCs from the SJB self-test.
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Are DTCs B106F and B1342 present?
Yes
CORRECT the cause of any other DTCs present. When the other DTCs are corrected, INSTALL a new SJB. REFER to Smart Junction Box (SJB) See:
Power and Ground Distribution/Power Distribution Module/Service and Repair/Smart Junction Box (SJB). TEST the system for normal operation.
No
GO to A2.
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A2 REPAIR OTHER DTCs
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Repair the cause of any DTCs present, other than DTC B106E. Refer to Diagnostic Trouble Code (DTC) Chart See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) Chart.
-
Clear the DTCs.
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Carry out the SJB self-test.
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Is DTC B106E still present?
Yes
The fault causing the output state to be disabled is still present. REPAIR the cause of the concern. CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern was caused by a fault in one of the output circuits.
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