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Pinpoint Test S: The Power Steering Control (PSC) Module Does Not Respond To The Scan Tool

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.
  1. S1 CHECK THE PSC MODULE CIRCUIT 838 (LG/VT) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: PSC Module C1463b
      • Fig 1: Checking Circuit For Voltage
      GF0025576Courtesy of FORD MOTOR CO.
    • Measure the voltage between PSC module C1463b-1, circuit 838 (LG/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  S2.
    2. NO  : VERIFY battery junction box (BJB) fuses 25 (50A) and 32 (50A), if OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. S2 CHECK THE PSC MODULE CIRCUIT 601 (LB/PK) FOR VOLTAGE 
    • Disconnect: PSC Module C1463a
    • Key in ON position.
      • Fig 2: Checking Circuit For Voltage
      GF0025577Courtesy of FORD MOTOR CO.
    • Measure the voltage between PSC module C1463a-1, circuit 601 (LB/PK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  S3.
    2. NO  : VERIFY the smart junction box (SJB) fuse 34 (5A), if OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. S3 CHECK THE PSC 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 PSC module C1463b-3, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 2 ohms? 
    1. YES  : Go to  S4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. S4 CHECK THE HS-CAN CIRCUITS BETWEEN THE PSC MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN 
      Fig 4: Checking Circuits For Open
      GF0025575Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PSC module C1463a-14, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the PSC module C1463a-16, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  S5.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  5. S5 CHECK FOR CORRECT PSC MODULE OPERATION 
    • Disconnect all the PSC module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PSC module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a PSC module. REFER to POWER STEERING article. CLEAR the DTCs. REPEAT the network test with the scan tool.
    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 network test with the scan tool.
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