Expedition 2WD V8-5.4L (2009)
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A5 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
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Measure the resistance 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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Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable.GO to A6.
No
CONNECT the negative battery cable. Go To Pinpoint Test W. See: Pinpoint Test W: Intermittent No High Speed Controller Area Network (HS-CAN)
Communication, One Or More Modules Are Not Respond
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A6 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
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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 circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to A7.
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A7 CHECK FOR CORRECT PCM OPERATION
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Disconnect all the PCM connectors.
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Check for:
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corrosion
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damaged pins
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pushed-out pins
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Connect all the PCM connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
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Is the concern still present?
Yes
INSTALL a new PCM. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the
