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HOMESERVICE MANUALSCHEVROLET1992ASTRO VAN PASSENGER, 4.3 W, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - A/TSERVICE BULLETINSNO LOCK-UP CONDITION
1992 Chevrolet Astro Van Passenger, 4.3 W, RWD

No Lock-Up Condition

1992 Chevrolet Astro Van Passenger, 4.3 W, RWDSECTION No Lock-Up Condition
  1. Does TCC release with brake switch? If yes, go to step 3). If no, check brake switch. See BRAKE SWITCH TEST . If brake switch is okay, check TCC apply solenoid. See TCC APPLY SOLENOID TEST . If solenoid is okay, check for stuck lock-up apply valve or lock-up apply valve installed backward. Repair as necessary and retest.
  2. If apply valve is okay, block lock-up apply valve in unlocked position. If TCC still does not release, problem is located in torque converter or oil pump. If lock-up does not occur, check appropriate signal oil circuit.
  3. If TCC released in step 1), check for short to ground at terminal "D" wire of ALDL connector. See Figure. If short is found, check apply solenoid. See TCC APPLY SOLENOID TEST . If short is not found, check for computer system problem. See CHECKING SELF-DIAGNOSTIC SYSTEM.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.