Mustang V8-4.6L (2009)
CONNECT the negative battery cable. Go To Pinpoint Test I. See: Pinpoint Test I: No Medium Speed Controller Area Network (MS-CAN)
Communication, All Modules Are Not Responding
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H3 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
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Measure the resistance 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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Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to H4.
No
CONNECT the negative battery cable. Go To Pinpoint Test I. See: Pinpoint Test I: No Medium Speed Controller Area Network (MS-CAN)
Communication, All Modules Are Not Responding
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H4 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 circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to H5.
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H5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM AND SDARS 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 Fuse 56 (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
If the vehicle is equipped with a SDARS module, GO to H6.
Otherwise, Go To Pinpoint Test E. See: Pinpoint Test E: The Audio Control Module (ACM) Does Not Respond To The Scan Tool