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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Front Drive Axle - 4WD >> System Tests >> Test C: Selective Four-Wheel Drive Does Not Disengage (S4WD)

Test C: Selective Four-Wheel Drive Does Not Disengage (S4WD)

  1. If you were sent here from the symptom index table, go to next step. See SYMPTOM INDEX (BLAZER - JIMMY CANADIAN, JIMMY, SONOMA & S10 PICKUP)  table. If you were not sent here from the symptom index table, go to DIAGNOSTIC STARTING POINT .
  2. Check the transfer case shift control module for DTCs. See appropriate TRANSFER CASES article in TRANSMISSION. If no DTCs are present, go to next step.
  3. Inspect the vacuum hoses for kinks, plugged line or damage. If vacuum lines are damaged, go to next step. If vacuum lines are not damaged, go to step  5.
  4. Repair or replace the vacuum hoses as necessary. If front axle disengages, system is okay. If front axle does not disengage, go to next step.
  5. Disconnect the vacuum hose at the vacuum actuator. Inspect the vacuum actuator for movement. If vacuum actuator moves to disengage front axle, go to next step. If vacuum actuator does not move to disengage front drive axle, go to step  7.
  6. Replace the vacuum actuator switch. After repair, if front axle disengages, system is okay. If front axle does not disengage, go to step  8.
  7. Replace the vacuum actuator. See ACTUATOR ASSEMBLY  under REMOVAL & INSTALLATION. After repair, if front axle disengages, system is okay. If front axle does not disengage, go to next step.
  8. Inspect the clutch cable for damage or binding. If clutch cable is damaged or binding, go to next step. If clutch cable is not damaged or binding, go to step  10.
  9. Replace the clutch cable. See CLUTCH CABLE REPLACEMENT  under REMOVAL & INSTALLATION. After repair, if front axle disengages, system is okay. If front axle does not disengage, go to next step.
  10. Disconnect the clutch cable from the clutch fork. Inspect the operation of the clutch fork using Hub Engagement Tool (J-33798). If front axle disengages, system is okay. If front axle does not disengage, go to next step.
  11. Replace the clutch fork. See CLUTCH FORK REPLACEMENT  under REMOVAL & INSTALLATION. After repair, if front axle disengages, system is okay. If front axle does not disengage, go to next step.
  12. The cause of concern may be in the front drive axle. Disassemble the front drive axle. Inspect for damaged components. See DIFFERENTIAL CARRIER  under OVERHAUL.
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