LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 756 (Anti-Lock Brake System - F150 & Mark LT) >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test G: The Traction Control OFF Indicator (in the Switch) is Always ON >> Pinpoint Test G: The Traction Control Off Indicator (In The Switch) Is Always On

Pinpoint Test G: The Traction Control Off Indicator (In The Switch) Is Always On

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. G1 CHECK THE TRACTION CONTROL SWITCH 
    • Key in OFF position.
    • Disconnect: Traction Control Switch C280
    • Measure the resistance between traction control switch C280-1, component side, and traction control switch C280-2, component side while pressing and releasing the switch.
    • Is the resistance greater than 10,000 ohms with the switch released and less than 5 ohms with the switch pressed? 
    1. YES  : Go to  G2.
    2. NO  : INSTALL a new traction control switch. TEST the system for normal operation.
  2. G2 CHECK CIRCUIT 959 (GY) FOR A SHORT TO VOLTAGE 
    • Disconnect: PCM C175b
    • Key in ON position.
    • Measure the voltage between traction control switch C280-2, circuit 959 (GY), harness side and ground.
      Fig 1: Checking Circuit 959 (GY) For Short To Voltage
      GF0003411Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. YES  : REPAIR circuit 959 (GY). TEST the system for normal operation.
    2. NO  : Go to  G3.
  3. G3 CHECK CIRCUIT 960 (BK/LB) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between traction control switch C280-4, circuit 960 (BK/LB), harness side and ground.
      Fig 2: Checking Circuit 960 (BK/LB) For Short To Ground
      GF0003412Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G5.
    2. NO  : Go to  G4.
  4. G4 ISOLATE THE PCM 
    • Disconnect: PCM C175b
    • Measure the resistance between traction control switch C280-4, circuit 960 (BK/LB), harness side and ground.
      Fig 3: Isolating PCM
      GF0003412Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 960 (BK/LB). TEST the system for normal operation.
  5. G5 CHECK FOR CORRECT PCM OPERATION 
    • Check PCM C175b for:
      • corrosion.
      • pushed-out pins.
      • spread terminal.
    • Connect: PCM C175b
    • Make sure the connector is seated correctly then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
scientia non olet · About LEMON Manuals