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Pinpoint Test F: DTC C1778 - Power Steering Failure

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Repair DTC C2278 before proceeding with this pinpoint test.
  1. F1 CHECK THE POWER STEERING CONTROL MODULE CIRCUIT 838 (LG/VT) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Power Steering Control Module C1463b
      • Fig 1: Checking Circuit For Voltage
      GF0025576Courtesy of FORD MOTOR CO.
    • Measure the voltage between power steering control module C1463b-1, circuit 838 (LG/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  F2.
    2. NO  : INSPECT battery junction box (BJB) fuses 25 (50A) and 32 (50A), if OK, REPAIR circuit 838 (LG/VT). CLEAR the DTCs. CYCLE the ignition switch to the OFF position for 3 seconds. REPEAT the self-test.
  2. F2 CHECK THE POWER STEERING CONTROL MODULE CIRCUIT 601 (LB/PK) FOR VOLTAGE 
    • Disconnect: Power Steering Control Module C1463a
    • Key in ON position.
      • Fig 2: Checking Circuit For Voltage
      GF0025577Courtesy of FORD MOTOR CO.
    • Measure the voltage between power steering control module C1463a-1, circuit 601 (LB/PK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  F3.
    2. NO  : INSPECT smart junction box (SJB) fuses 34 (5A), 4 (10A) and battery junction box (BJB) fuse 15 (20A). If OK, REPAIR circuit 601 (LB/PK). CLEAR the DTCs. CYCLE the ignition switch to the OFF position for 3 seconds. REPEAT the self-test.
  3. F3 CHECK THE POWER STEERING CONTROL MODULE CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
      • Fig 3: Checking Circuit For Open
      GF0025578Courtesy of FORD MOTOR CO.
    • Measure the resistance between power steering control module C1463b-3, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 2 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR circuit 57 (BK). CLEAR the DTCs. CYCLE the ignition switch to the OFF position for 3 seconds. REPEAT the self-test.
  4. F4 CHECK CIRCUITS 3140 (BK) AND 3141 (WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Power Steering Motor C1467a
      • Fig 4: Checking Circuits For Open
      GF0025579Courtesy of FORD MOTOR CO.
    • Measure the resistance between:
      • power steering control module C1463b-2, circuit 3140 (BK), harness side and power steering motor C1467a-2, circuit 3140 (BK), harness side.
      • power steering control module C1463b-4, circuit 3141 (WH), harness side and power steering motor C1467a-1, circuit 3141 (WH), harness side.
    • Are the resistances less than 2 ohms? 
    1. YES  : Go to  F5.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. CYCLE the ignition switch to the OFF position for 3 seconds. REPEAT the self-test.
  5. F5 CHECK THE STEERING GEAR MOTOR FOR AN OPEN 
      Fig 5: Checking Circuit For Open
      GF0025580Courtesy of FORD MOTOR CO.
    • Measure the resistance between power steering motor C1467a-2, circuit 3140 (BK), component side and power steering motor C1467a-1, circuit 3141 (WH), component side.
    • Is the resistance less than 2 ohms? 
    1. YES  : Go to  F6.
    2. NO  : INSTALL a new steering gear. REFER to POWER STEERING article. CLEAR the DTCs. CYCLE the ignition switch to the OFF position for 3 seconds. REPEAT the self-test.
  6. F6 CHECK FOR CORRECT POWER STEERING CONTROL MODULE OPERATION 
    • Disconnect all the power steering control module connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect all power steering control module connectors and make sure they are seated correctly.
    • Operate the system and verify if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new power steering control module. REFER to POWER STEERING article. CLEAR the DTCs. CYCLE the ignition switch to the OFF position for 3 seconds. 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. CYCLE the ignition switch to the OFF position for 3 seconds. REPEAT the self-test.
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