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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1080 (Four Wheel Drive (4WD) Systems) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test E: High-Speed Controller Area Network (HS-CAN) Communications Bus Fault >> Pinpoint Test E: High-Speed Controller Area Network (HS-Can) Communications Bus Fault

Pinpoint Test E: High-Speed Controller Area Network (HS-Can) Communications Bus Fault

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Conduct Steps 1 through 10 outlined in Inspection and Verification prior to carrying out this test.
  1. E1 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE 4X4 CONTROL MODULE FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between 4X4 control module C3184-3, circuit VDB04 (WH/BU), harness side and DLC C251-6, circuit VDB04 (WH/BU), harness side; and between 4X4 control module C3184-11, circuit VDB05 (WH), harness side and DLC C251-14, circuit VDB05 (WH), harness side.
      • Fig 1: Measuring Resistance
      GF0042454Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  E2.
    2. NO  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
  2. E2 CHECK THE HS-CAN CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between 4X4 control module C3184-3, circuit VDB04 (WH/BU), harness side and ground; and between 4X4 control module C3184-11, circuit VDB05 (WH), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0042455Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
  3. E3 CHECK THE RESISTANCE BETWEEN HS-CAN CIRCUITS 
    • Key in OFF position.
      NOTE: The PCM and the instrument cluster (IC) must be connected and operating correctly to obtain the correct resistance between the HS-CAN circuits.
    • Measure the resistance between 4X4 control module C3184-3, circuit VDB04 (WH/BU) harness side and 4X4 control module C3184-11, circuit VDB05 (WH) harness side.
      • Fig 3: Measuring Resistance
      GF0042456Courtesy of FORD MOTOR CO.
    • Is the resistance 60 ohms (± 5 ohms)? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
  4. E4 CHECK FOR DTCs U0100 AND U0121 SET TOGETHER 
    • Carry out the 4X4 control module self-test.
    • Review the results of the 4X4 control module self-test.
    • Are DTCs U0100 and U0121 set together? 
    1. YES  : REFER to MODULE COMMUNICATIONS NETWORK article to continue diagnosis of the communications network.
    2. NO  : Go to  E5.
  5. E5 CHECK FOR DTC U0100 
    • Refer to the results of the 4X4 control module self-test.
    • Is DTC U0100 set? 
    1. YES  : The PCM is not sending any data to the 4X4 control module. REFER to the Introduction - Gasoline Engines article for additional PCM diagnosis.
    2. NO  : Go to  E6.
  6. E6 CHECK FOR DTC U0121 
    • Refer to the results of the 4X4 control module self-test.
    • Is DTC U0121 set? 
    1. YES  : The ABS module is not sending any data to the 4X4 control module. REFER to VEHICLE DYNAMIC SYSTEMS article for additional ABS diagnosis.
    2. NO  : Go to  E7.
  7. E7 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect the 4X4 control module.
    • Check the harness and component side connectors for:
      • corrosion.
      • pushed-out/bent pins.
    • Connect the 4X4 control module and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new 4X4 control module. REFER to 4X4 Control Module . CLEAR the DTCs. REPEAT the self-test.
    2. 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 self-test.
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