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Pinpoint Test H: No Controller Are Network (Can) Communication

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK THE DATA LINK CONNECTOR (DLC) C251 FOR DAMAGE 
    • Inspect the DLC C251 for damage.
    • Is the DLC C251 OK? 
    • Yes  : If equipped with a trailer brake controller, GO to H2. If not equipped with a trailer brake controller, GO to  H5.
    • No  : REPAIR the DLC C251 as necessary. CARRY OUT the data link diagnostics test.
  2. H2 CHECK THE TRAILER BRAKE CONTROLLER C2142B FOR DAMAGE 
    • Key in OFF position.
    • Disconnect: Trailer Brake Controller C2142b.
    • Inspect the trailer brake controller C2142b for damage.
    • Is the trailer brake controller C2142b OK? 
    • Yes  : GO to H3.
    • No  : REPAIR the trailer brake controller C2142b as necessary. CARRY OUT the data link diagnostics test.
  3. H3 CHECK CIRCUITS 1908 (WH) AND 1909 (BK) FOR AN OPEN BETWEEN THE DLC C251 AND THE TRAILER BRAKE CONTROLLER C2142B 
    • Measure the resistance between the trailer brake controller C2142b pin 6, circuit 1908 (WH), harness side and the DLC C251 pin 6, circuit 1908 (WH), harness side.
      Fig 1: Measuring Resistance Between Trailer Brake Controller C2142B Pin 6 Circuit 1908 (WH) & DLC C251 Pin 6, Circuit 1908 (WH)
      G03925121Courtesy of FORD MOTOR CO.
    • Measure the resistance between the trailer brake controller C2142b pin 7, circuit 1909 (BK), harness side and the DLC C251 pin 14, circuit 1909 (BK), harness side.
      Fig 2: Measuring Resistance Between Trailer Brake Controller C2142B Pin 7 Circuit 1909 (BK) & DLC C251 Pin 14, Circuit 1909 (BK)
      G03925122Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to H4.
    • No  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
  4. H4 CHECK THE COMMUNICATIONS NETWORK WITH THE TRAILER BRAKE CONTROLLER C2142B DISCONNECTED 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test.
    • Is system passed obtained? 
    • Yes  : GO to  H19.
    • No  : CONNECT the trailer brake controller C2142b. GO to H5.
  5. H5 CHECK THE ANTI-LOCK SYSTEM (ABS) MODULE C135 FOR DAMAGE 
    • Key in OFF position.
    • Disconnect: ABS Module C135.
    • Inspect the ABS module C135 for damage.
    • Is the ABS module C135 OK? 
    • Yes  : GO to H6.
    • No  : REPAIR the ABS module C135 as necessary. CARRY OUT the data link diagnostics test.
  6. H6 CHECK CIRCUITS 1908 (WH) AND 1909 (BK) FOR AN OPEN BETWEEN THE DLC C251 AND THE ABS MODULE C135 
    • Measure the resistance between the ABS module C135 pin 3, circuit 1908 (WH), harness side and the DLC C251 pin 6, circuit 1908 (WH), harness side.
      Fig 3: Measuring Resistance Between ABS Module C135 Pin 3 Circuit 1908 (WH) & DLC C251 Pin 6, Circuit 1908 (WH)
      G03925116Courtesy of FORD MOTOR CO.
    • Measure the resistance between the ABS module C135 pin 18, circuit 1909 (BK), harness side and the DLC C251 pin 14, circuit 1909 (BK), harness side.
      Fig 4: Measuring Resistance Between ABS Module C135 Pin 18 Circuit 1909 (BK) & DLC C251 Pin 14, Circuit 1909 (BK)
      G03925117Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to H7.
    • No  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
  7. H7 CHECK THE COMMUNICATIONS NETWORK WITH THE ABS MODULE C135 DISCONNECTED 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Data Link Diagnostics Test.
    • Is system passed obtained? 
    • Yes  : GO to  H16.
    • No  : CONNECT the ABS module C135. GO to H8.
  8. H8 CHECK THE POWERTRAIN CONTROL MODULE (PCM) C175B (GAS) OR C1381b (DIESEL) FOR DAMAGE 
    • Key in OFF position.
    • Disconnect: PCM C175b (gas) or PCM C1381b (diesel).
    • Inspect the PCM C175b (gas) or C1381b (diesel) for damage.
    • Is the PCM C175b (gas) or C1381b (diesel) OK? 
    • Yes  : For gas engine vehicles, GO to H9.

      For diesel engine vehicles, GO to  H10.

    • No  : REPAIR the PCM C175b (gas) or C1381b (diesel) as necessary. CARRY OUT the data link diagnostics test.
  9. H9 CHECK CIRCUITS 1908 (WH) AND 1909 (BK) FOR AN OPEN BETWEEN THE DLC C251 AND THE PCM C175B - GAS ENGINE VEHICLES 
    • Measure the resistance between the PCM C175b pin 11, circuit 1908 (WH), harness side and the DLC C251 pin 6, circuit 1908 (WH), harness side.
      Fig 5: Measuring Resistance Between PCM C175B Pin 11 Circuit 1908 (WH) & DLC C251 Pin 6, Circuit 1908 (WH)
      G03890600Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175b pin 23, circuit 1909 (BK), harness side and the DLC C251 pin 14, circuit 1909 (BK), harness side.
      Fig 6: Measuring Resistance Between PCM C175B Pin 23 Circuit 1909 (BK) & DLC C251 Pin 14, Circuit 1909 (BK)
      G03890601Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  H11.
    • No  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
  10. H10 CHECK CIRCUITS 1908 (WH) AND 1909 (BK) FOR AN OPEN BETWEEN THE DLC C251 AND THE PCM C1381b - DIESEL ENGINE VEHICLES 
    • Measure the resistance between the PCM C1381b pin 13, circuit 1908 (WH), harness side and the DLC C251 pin 6, circuit 1908 (WH), harness side.
      Fig 7: Measuring Resistance Between PCM C1381b Pin 13 Circuit 1908 (WH) & DLC C251 Pin 6, Circuit 1908 (WH)
      G03925130Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C1381b pin 14, circuit 1909 (BK), harness side and the DLC C251 pin 14, circuit 1909 (BK), harness side.
      Fig 8: Measuring Resistance Between PCM C1381b Pin 14 Circuit 1909 (BK) & DLC C251 Pin 14, Circuit 1909 (BK)
      G03925131Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to H11.
    • No  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
  11. H11 CHECK THE INSTRUMENT CLUSTER C220B FOR DAMAGE 
    • Disconnect: Instrument Cluster C220b.
    • Inspect the instrument cluster C220b for damage.
    • Is the instrument cluster C220b OK? 
    • Yes  : GO to H12.
    • No  : REPAIR the instrument cluster C220b as necessary. CARRY OUT the data link diagnostics test.
  12. H12 CHECK CIRCUITS 1908 (WH) AND 1909 (BK) FOR AN OPEN BETWEEN THE DLC C251 AND THE INSTRUMENT CLUSTER C220B 
    • Measure the resistance between the instrument cluster C220b pin 7, circuit 1908 (WH), harness side and the DLC C251 pin 6, circuit 1908 (WH), harness side.
      Fig 9: Measuring Resistance Between Instrument Cluster C220B Pin 7 Circuit 1908 (WH) & DLC C251 Pin 6, Circuit 1908 (WH)
      G03925132Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220b pin 6, circuit 1909 (BK), harness side and the DLC C251 pin 14, circuit 1909 (BK), harness side.
      Fig 10: Measuring Resistance Between Instrument Cluster C220B Pin 6 Circuit 1909 (BK) & DLC C251 Pin 14, Circuit 1909 (BK)
      G03925133Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to H13.
    • No  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
  13. H13 CHECK THE CAN CIRCUITS 1908 (WH) AND 1909 (BK) FOR A SHORT TO VOLTAGE 
    • Disconnect: ABS Module C135.
    • Disconnect: Trailer Brake Module C2142b.
    • Key in ON position.
    • Measure the voltage between the DLC C251 pin 6, circuit 1908 (WH), harness side and ground; and between the DLC C251 pin 14, circuit 1909 (BK), harness side and ground.
      Fig 11: Checking The CAN Circuits 1908 (WH) And 1909 (BK) For A Short To Voltage
      G03890612Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
    • No  : GO to H14.
  14. H14 CHECK THE CAN CIRCUITS 1908 (WH) AND 1909 (BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the DLC C251 pin 6, circuit 1908 (WH), harness side and ground; and between the DLC C251 pin 14, circuit 1909 (BK), harness side and ground.
      Fig 12: Checking The CAN Circuits 1908 (WH) And 1909 (BK) For A Short To Ground
      G03890611Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to H15.
    • No  : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
  15. H15 CHECK THE CAN WITH A SUBSTITUTED PCM 
    • Yes  : GO to  H18.
    • No  : GO to  H17
  16. H16 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all the ABS module connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the ABS module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new ABS module. REFER to ANTI-LOCK CONTROL . CARRY OUT the data link diagnostics test.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test.
  17. H17 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . CARRY OUT the data link diagnostics test.
    • 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.
  18. H18 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
  19. H19 CHECK FOR CORRECT TRAILER BRAKE CONTROLLER OPERATION 
    • Disconnect all the trailer brake controller connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the trailer brake controller connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new trailer brake controller. REFER to AUXILIARY BRAKE SYSTEM . CARRY OUT the data link diagnostics test.
    • 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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