Component Testing Overview for F550 4WD Super Duty V10-68L
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Ignition ON.
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Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit
VDB05 (WH), harness side and ground.
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Is the voltage greater than 6 volts?
Yes
REPAIR the short to voltage. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to S5.
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S5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED
NOTE: An Integrated Diagnostic System (IDS) session must be established prior to disabling the PCM in this test step. If the PCM has failed
communication during multiple attempts to identify the vehicle, first identify the vehicle manually by entering a PCM part number, calibration number or
tear tag when prompted by IDS.
NOTE: When a vehicle is manually identified by a PCM part number, calibration number or tear tag, the IDS will not automatically run a network test.
The network test must be manually selected and run.
NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network
test results.
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Disconnect: Battery Junction Box (BJB) Fuses 71 (5A) and 76 (20A).
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Enter the following diagnostic mode on the scan tool: Network Test.
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Repeat the network test.
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Do all other modules pass the network test?
Yes
INSTALL the removed fuses. Go To Pinpoint Test A. See: Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to S6.
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S6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network
test results.
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Disconnect: BJB Fuse 77 (10A).
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Enter the following diagnostic mode on the scan tool: Network Test.
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Repeat the network test.
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Do all other modules pass the network test?
Yes
INSTALL the removed fuse. Go To Pinpoint Test B. See: Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
If the vehicle is equipped with a TBC module, INSTALL the removed fuse. GO to S7.
