Grand Marquis V8-4.6L Flex Fuel (2010)
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Is the resistance between 54 and 132 ohms?
Yes
GO to J3.
No
GO to Pinpoint Test A. See: Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
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J3 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 1827 (WH/LG), harness side and ground; and between the DLC C251-14, circuit 1828
(PK/LG), harness side and ground.
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Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to J4.
No
GO to Pinpoint Test A. See: Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
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J4 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 1827 (WH/LG), harness side and ground; and between the DLC C251-14, circuit 1828
(PK/LG), 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 J5.
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J5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED
NOTE: An Integrated Diagnostic System (IDS) session must be established prior to disabling the PCM in this test step. If the PCM has failed
communication during multiple attempts to identify the vehicle, first identify the vehicle manually by entering a PCM part number, calibration number or
tear tag when prompted by IDS.
NOTE: When a vehicle is manually identified by a PCM part number, calibration number or tear tag, the IDS does not automatically run a network test.
The network test must be manually selected and run.
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Disconnect: Battery Junction Box (BJB) Fuses 3 (10A), 7 (30A) and 20 (15A).
