E 450 V8-5.4L (2009)
For stripped chassis, GO to I18.
Otherwise, GO to I16.
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I16 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO
GROUND WITH THE ACM OR IN-DASH COMPUTER DISCONNECTED
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Disconnect: Audio Control Module (ACM) C290a (if equipped).
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Disconnect: In-Dash Computer C2408b (if equipped).
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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 all modules. CONNECT the negative battery cable.
For vehicles equipped with an ACM, GO to I20.
For vehicles equipped with an in-dash computer, GO to I23.
No
If the vehicle is equipped with a Parking Aid Module (PAM), GO to I17.
If the vehicle is not equipped with a PAM, GO to I18.
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I17 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO
GROUND WITH THE PAM DISCONNECTED
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Disconnect: PAM C2023.
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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.
-
Are the resistances greater than 1,000 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to I21.
No
GO to I18.
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I18 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO
GROUND WITH THE IC DISCONNECTED