Pinpoint Test C: HARD STEERING/LACK OF ASSIST (NO DTCS PRESENT)

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

C1 CHECK CIRCUITS 8-CE9 (WH/GN) AND 9-CE9 (BN/GN) FOR A SHORT TOGETHER
- Disconnect: VAPS Solenoid C120.
- Measure the resistance between variable assist power steering (VAPS) solenoid C120-1, circuit 8-CE9 (WH/GN), and the VAPS solenoid C120-2, circuit 9-CE9 (BN/GN), harness side.
  
  Fig 1: Measuring Resistance Between VAPS Solenoid C120-1, Circuit 8-CE9 (WH/GN), And The VAPS Solenoid C120-2, Circuit 9-CE9 (BN/GN), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to C2.
- No : REPAIR the circuit(s) in question. TEST the system for normal operation.
C2 CHECK THE VAPS SOLENOID
- Measure the resistance across the VAPS solenoid C120 terminals 1 and 2, component side.
  
  Fig 2: Measuring Resistance Across VAPS Solenoid C120 Terminals 1 And 2
  Courtesy of FORD MOTOR CO.
- Is the resistance between 6 and 8 ohms?
- Yes : CARRY OUT the front electronic module (FEM) diagnosis. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : INSTALL a new VAPS solenoid. TEST the system for normal operation.