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Test 12A: Left Front Wheel Speed Sensor

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAM  .
  1. Using scan tool, read DTCs. If scan tool displays LF WSS CONTINUITY, go to TEST 16A  . If scan tool does not display LF WSS CONTINUITY, go to next step.
  2. Wheel speed sensor DTCs set when CAB fails to detect a signal from one or more sensors for a predetermined amount of time. Possible causes are: wheel speed sensor loose at wheel, damaged wheel speed sensor, damaged tone wheel, hydroplaning at high speed, intermittent open sensor circuit, wheel lockup during ABS stop, excessive sensor gap or runout, or missing tone wheel. Go to next step.
  3. If any possible cause in step 2) is present, repair as necessary. Erase DTCs. Perform TEST VER-1A  . If none of the possible causes are present, go to next step.
  4. Raise vehicle on a hoist. Inspect left front tire. If tire wear is excessive, replace tire. Perform TEST VER-1A  . If tire wear is not excessive, go to next step.
  5. Rotate left front tire by hand. If tire is difficult to rotate, repair dragging brakes. Perform TEST VER-1A  . If tire rotates with minimal resistance, go to next step.
  6. Using scan tool, read Left Front Wheel Speed Sensor (LF WSS) signal while rotating left front tire. If scan tool shows more than zero MPH, go to TEST 12B  . If scan tool does not show more than zero MPH, go to next step.
  7. Inspect left front tone wheel for damage (chipping or cracking). If tone wheel is damaged, replace tone wheel. Perform TEST VER-1A  . If tone wheel is okay, go to next step.
  8. Inspect LF WSS for damage and proper connection. If LF WSS is damaged or loose, replace or repair LF WSS as necessary. Perform TEST VER-1A  . If LF WSS is not damaged or loose, go to next step.
  9. Using a feeler gauge, check air gap between LF WSS and tone wheel. If clearance is more than .07" (1.7 mm), repair or replace backing plate. Perform TEST VER-1A  . If clearance is not more than .07" (1.7 mm), go to next step.
  10. Disconnect and inspect LF WSS connector. Repair connector as necessary. Perform TEST VER-1A  . If connector is okay, go to next step.
  11. Turn ignition on. Using an external voltmeter, check voltage across sensor terminals. If voltage is more than 4 volts, replace LF WSS. Perform TEST VER-1A  . If voltage is 4 volts or less, go to next step.
  12. Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) 60-pin connector. Inspect, clean and repair connector as necessary. Perform TEST VER-1A  . If connector is okay, go to next step.
  13. Using scan tool in ohmmeter mode, check resistance between CAB connector terminals No. 8 (Orange/Dark Blue wire) and No. 9 (Orange wire). If resistance is 5 ohms or more, go to TEST 20A  . If resistance is less than 5 ohms, repair Orange/Dark Blue wire and Red/Dark Blue wire, or Orange wire and Red wire for a short to each other. Perform TEST VER-1A  .
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