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Test 13A: Right Front Sensor Signal Missing Or Speed Comparison

NOTE: Perform TEST 1A: CHECKING SYSTEM FOR DIAGNOSTIC TROUBLE CODES (DTCS)  before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS  .
  1. DTC may be caused by missing tone wheel, improperly mounted Right Front (RF) Wheel Speed Sensor (WSS), operating vehicle on hoist or chassis dynamometer, defective CAB or defective RF WSS. On DTC for missing signal, DTC may also be caused by long stops on ice.
  2. Using scan tool, read DTCs. If scan tool displays RIGHT FRONT SENSOR CIRCUIT FAILURE, perform TEST 6A: SENSOR CIRCUIT  . If scan tool does not display RIGHT FRONT SENSOR CIRCUIT FAILURE, go to next step.
  3. Have assistant drive vehicle while you monitor RF WSS while slowly accelerating straight ahead from a stop to 15 MPH. If RF WSS shows 0 MPH or lags behind any other WSS more than 3 MPH, go to step 5). If RF WSS does not show 0 MPH or lag behind any other WSS more than 3 MPH, go to next step.
  4. At this time, RF WSS signal is okay. DTC may have been set by attempting to stop on very slick road surfaces or brakes locking due to contamination or overheating. Check and repair brakes as necessary. Test is complete. Perform TEST VER-1A: VERIFICATION TEST  .
  5. Inspect RF WSS for looseness or damage. Repair RF WSS as necessary. Perform TEST VER-1A: VERIFICATION TEST  . If RF WSS sensor is okay, go to next step.
  6. Inspect RF tone wheel for damaged or missing teeth. Ensure teeth are square and are not bent or nicked. If tone wheel is okay, go to next step. If tone wheel is damaged, replace tone wheel. Perform TEST VER-1A: VERIFICATION TEST  .
  7. Using feeler gauge, measure air gap between end of RF WSS and teeth on tone wheel at 4 different places on tone wheel. Air gap should be .020-.065" (.52-1.64 mm). If air gap is within specification, go to next step. If air gap is not within specification, repair components as necessary. Perform TEST VER-1A: VERIFICATION TEST  .
  8. Inspect RF wheel bearings for excessive runout or clearance. If no excessive RF wheel bearing runout or clearance exists, go to next step. If excessive RF wheel bearing runout or clearance exists, repair as necessary. Perform TEST VER-1A: VERIFICATION TEST  .
  9. Turn ignition off. Disconnect CAB connector. Inspect CAB connector and terminals for damage. Repair connector and terminals as necessary. Perform TEST VER-1A: VERIFICATION TEST  . If connector and terminals are okay, go to next step.
  10. Using scan tool in ohmmeter mode, check resistance between CAB connector terminals No. 1 (White wire) and No. 6 (White/Dark Blue wire). If resistance is less than 200 ohms, repair White wire for short to White/Dark Blue wire. Perform TEST VER-1A: VERIFICATION TEST  . If resistance is 200 ohms or more, replace RF WSS. Perform TEST VER-1A.
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