E 450 V8-5.4L (2009)
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Are the resistances greater than 5,000 ohms?
Yes
GO to C3.
No
REPAIR the circuit(s). CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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C3 CHECK THE HS-CAN CIRCUITS FOR AN OPEN BETWEEN THE IC AND THE DLC
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Disconnect: IC C220.
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Measure the resistance between the IC C220-7, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness
side.
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Measure the resistance between the IC C220-6, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
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Are the resistances less than 5 ohms?
Yes
GO to C4.
No
REPAIR the circuit(s). CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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C4 CHECK THE MS-CAN CIRCUITS FOR AN OPEN BETWEEN THE IC AND THE DLC
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Measure the resistance between the IC C220-10, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness
side.
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Measure the resistance between the IC C220-9, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness
side.
