F 550 4WD Super Duty V10-6.8L (2009)
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Are the resistances greater than 5,000 ohms?
Yes
CONNECT the negative battery cable. GO to U4.
No
Go To Pinpoint Test P. See: Pinpoint Test P: The 4X4 Control Module Does Not Respond To The Scan Tool
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U4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
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Ignition ON.
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Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07
(VT/OG), 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 U5.
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U5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC 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: SJB Fuses 15 (10A) and 37 (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 fuses. Go To Pinpoint Test J. See: Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool
No
If the vehicle is equipped with a RETM, INSTALL the removed fuse. GO to U6.
If the vehicle is not equipped with a RETM, INSTALL the removed fuse. GO to U7.
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U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM 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.
