Pinpoint Test F: The Stability/Traction Control System Is Inoperative Or Cannot Be Disabled

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

F1 CHECK FOR ABS MODULE DTCs
- Attempt to disable the traction control system by pressing the Stability/Traction Control Switch.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Is DTC U0073, U0155 or U0423 present?
- Yes : For DTCs U0073 and U0155, GO to MODULE COMMUNICATIONS NETWORK article.
  For DTC U0423, CARRY OUT a self-test of the IC and REFER to INFORMATION CENTER - INSTRUMENTATION AND WARNING CHIMES article to diagnose the IC concern.
- No : GO to F2.
F2 ISOLATE THE STABILITY/TRACTION CONTROL SWITCH
- Ignition OFF.
- Disconnect: Stability/Traction Control Switch C280.
- Measure the resistance between stability/traction control switch pin-1 and pin-6, component side, while pressing and releasing the switch.
- Is the resistance less than 5 ohms with the switch pressed and greater than 10, 000 ohms with the switch released?
- Yes : GO to F3.
- No : INSTALL a new stability/traction control switch. REFER to TRACTION CONTROL SWITCH . TEST the system for normal operation.
F3 CHECK THE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect: IC C220B.
- Measure the resistance between stability/traction control switch C280-1, circuit CCB23 (VT/GN), harness side and ground.
  
  Fig 1: Measuring Resistance Between Stability/Traction Control Switch C280-1, Circuit CCB23 (VT/GN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
- Yes : GO to F4.
- No : REPAIR circuit CCB23 (VT/GN). TEST the system for normal operation.
F4 CHECK THE SWITCH INPUT CIRCUIT FOR AN OPEN
- Measure the resistance between stability/traction control switch C280-1, circuit CCB23 (VT/GN), harness side and IC C220B-16, circuit CCB23 (VT/GN), harness side.
  
  Fig 2: Checking Switch Input Circuit For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to F5.
- No : REPAIR circuit CCB23 (VT/GN). TEST the system for normal operation.
F5 CHECK THE SWITCH GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between stability/traction control switch C280-6, circuit GD174 (BK/WH), harness side and ground.
  
  Fig 3: Measuring Resistance Between Stability/Traction Control Switch C280-6, Circuit GD174 (BK/WH), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to F6.
- No : REPAIR circuit GD174 (BK/WH). TEST the system for normal operation.
F6 CHECK FOR CORRECT IC OPERATION
- Check IC C220 for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect the IC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new IC. REFER to INFORMATION CENTER - INSTRUMENTATION AND WARNING CHIMES article. CLEAR the DTCs. REPEAT the self-test.
- 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.