Grand Marquis V8-4.6L Flex Fuel (2010)
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Inspect the DLC pin 7 for damage.
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Is the DLC pin 7 OK?
Yes
GO to L2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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L2 CHECK THE ISO 9141 CIRCUIT FOR A SHORT TO VOLTAGE
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Disconnect: Negative Battery Cable.
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Wait at least 1 minute.
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Disconnect: RCM C310a.
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Disconnect: FSSM C3281a (If Equipped).
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Ignition ON.
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Measure the voltage between the DLC C251-7, circuit 70 (LB/WH), harness side and ground.
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Is any voltage present?
Yes
REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to L3.
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L3 CHECK THE ISO 9141 CIRCUIT FOR A SHORT TO GROUND
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Ignition OFF.
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Measure the resistance between the DLC C251-7, circuit 70 (LB/WH), harness side and ground.
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Is the resistance greater than 10,000 ohms?
