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Pinpoint Test D: The PSCM Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2011 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, BATTERY MOUNTING & BATTERY CABLES article.
  1. D1 CHECK THE PSCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Disconnect: PSCM C1467a.
    • Ignition ON.
    • Measure the voltage between the PSCM C1467a-3, circuit CBP34 (VT/BN), harness side and ground.
      Fig 1: Measuring Voltage Between PSCM C1467b-3, Circuit CBP42 (GN), Harness Side And Ground
      G06254348Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to D2.
    2. No  : VERIFY the Smart Junction Box (SJB) fuse 34 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. D2 CHECK THE PSCM GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: PSCM C1467b.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance between the PSCM C1467b-2, circuit GD108 (BK/VT), harness side and ground.
      Fig 2: Measuring Resistance Between PSCM C1467A-2, Circuit GD104 (BK/GN), Harness Side And Ground
      G06254349Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to D3.
    2. No  : REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. D3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PSCM AND THE DLC FOR AN OPEN 
    • Measure the resistance between the PSCM C1467a-1, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
      Fig 3: Measuring Resistance Between PSCM C1467B-1 And DLC C251-6, Circuit VDB04 (WH/BU), Harness Side
      G06254350Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PSCM C1467a-2, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
      Fig 4: Measuring Resistance Between PSCM C1467B-2 And DLC C251-14, Circuit VDB05 (WH), Harness Side
      G06254351Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : CONNECT the negative battery cable. GO to D4.
    2. No  : REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. D4 CHECK FOR CORRECT PSCM OPERATION 
    • Disconnect all the PSCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PSCM 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 new PSCM (part of the steering gear). REFER to POWER STEERING SYSTEM 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.
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