Grand Marquis V8-4.6L Flex Fuel (2010)
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Is the resistance greater than 10,000 ohms?
Yes
REPAIR the DLC or the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
A capacitor internal to a module may still be draining causing irregular resistance readings. WAIT 5 minutes. REPEAT the pinpoint test.
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K11 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED
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Disconnect: PCM C175b.
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Measure the resistance between the DLC C251-6, circuit 1827 (WH/LG), harness side and the DLC C251-14, circuit 1828 (PK/LG), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to K12.
No
CONNECT the negative battery cable. GO to K21.
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K12 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED
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Disconnect: ABS Module C135.
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Measure the resistance between the DLC C251-6, circuit 1827 (WH/LG), harness side and the DLC C251-14, circuit 1828 (PK/LG), harness side.
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Is the resistance less than 5 ohms?
Yes
If the vehicle is equipped with a Fire Suppression System Module (FSSM), GO to K13.
If the vehicle is not equipped with an FSSM, GO to K14.
No
CONNECT all modules. CONNECT the negative battery cable. GO to K22.
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K13 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE FSSM DISCONNECTED
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Disconnect: FSSM C3281a.
