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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 1448 (Anti-Lock Brake System Control) >> Diagnosis And Testing >> Principles of Operation >> Pinpoint Test Q: The Stability Assist Switch Indicator Is Never/Always On >> Pinpoint Test Q: The Stability Assist Switch Indicator Is Never/Always On

Pinpoint Test Q: The Stability Assist Switch Indicator Is Never/Always On

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Q1 DETERMINE THE CONDITION 
    • Key in ON position.
    • Observe the stability traction control switch indicator.
    • Is the OFF indicator on the stability traction control switch illuminated? 
    • Yes  : GO to Q2.
    • No  : GO to  Q4.
  2. Q2 CHECK THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 
    • Key in OFF position.
    • Disconnect: ABS Module C155.
    • Key in ON position.
    • Does the OFF indicator on the stability traction control switch continue to illuminate? 
    • Yes  : GO to Q3.
    • No  : GO to Q3.
  3. Q3 CHECK CIRCUIT 960 (BK/LB) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Stability Traction Control Switch C280.
    • Measure the resistance between the stability traction control switch C280-4, circuit 960 (BK/LB), harness side and ground.
      Fig 1: Measuring Resistance Between Stability Traction Control Switch And Ground
      G03928856Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : INSTALL a new stability traction control switch. REFER to STABILITY TRACTION CONTROL SWITCH . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. Q4 CHECK CIRCUIT 1003 (GY/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Stability Traction Control Switch C280.
    • Measure the voltage between the stability traction control switch C280-6, circuit 1003 (GY/YE), harness side and ground.
      Fig 2: Measuring Voltage Between Stability Traction Control Switch And Ground
      G03944868Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to Q5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. Q5 CHECK CIRCUIT 960 (BK/LB) FOR AN OPEN 
    • Disconnect: ABS Module C155.
    • Measure the resistance between the stability traction control switch C280-4, circuit 960 (BK/LB), harness side and the ABS module C155-13, circuit 960 (BK/LB), harness side.
      Fig 3: Measuring Resistance Between Stability Traction Control Switch And ABS Module
      G03928858Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to Q6.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. Q6 CHECK THE STABILITY TRACTION CONTROL SWITCH 
    • Connect: Stability Traction Control Switch C280.
    • Connect a fused (5A) jumper wire between the ABS module C155-13, circuit 960 (BK/LB), harness side and ground.
      Fig 4: Checking Stability Traction Control Switch
      G03928859Courtesy of FORD MOTOR CO.
    • Is the OFF indicator on the stability traction control switch illuminated? 
  7. Q7 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all the ABS connectors.
    • Check for:
      • Corrosion
      • pushed-out pins
    • Connect all the ABS 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 BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.
    • 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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