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Home >> Saturn >> 1995 >> SW2 Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis >> Diagnostic Tests >> DTC 23 - No 3RD Gear >> Diagnostic Procedure

Diagnostic Procedure

  1. Determine if DTCs/information flags 14, 45, 46, 49, 68, 73, 74, 76, 77, 78, 95, 98 or 99 are present. These flags must be eliminated first as a possible cause for DTC 23.
  2. Check actuator operation. See ACTUATOR QUICK CHECK  under SELF-DIAGNOSTIC SYSTEM  . Operation sound of all actuators should be similar.
  3. Check pressure regulator valve operation. See HYDRAULIC PRESSURE TESTS in OVERHAUL article. If line pressure does not change or changes slightly, regulator valve is stuck. Repair as needed.
  4. Air check 3rd clutch operation. See overhaul article. Repair as needed. If clutch air checks okay, disassembly of transaxle will be necessary to inspect internal components.
  5. Cross-channel leaks may cause other clutches to be applied. If PCM detects other gears are stuck on, other DTCs will be present. This may help locate cross-channel leak.
  6. If clutch applies and releases, check valve body for damage. If clutch does not operate, check for failed clutch plates.
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