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Home › Lexus › 2003 › GS 430 › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transmission - Diagnostics › Problem Symptoms Table › Category 3: Off-Vehicle Repair

Category 3: Off-Vehicle Repair

SUSPECT AREA

Symptom Suspect Area Action
Vehicle does not move in any forward position and reverse positions
  1. O/D one-way clutch (F0)
  2. O/D direct clutch (C0)
  3. O/D planetary gear unit
  4. Torque converter clutch
  1. (1)
  2. (1)
  3. (1)
  4. TORQUE CONVERTER
Vehicle does not move in R position
  1. Center and rear planetary gear unit
  2. Direct clutch (C2)
  3. 1st & reverse brake (B4)
  4. O/D brake (B0)
  1. (1)
  2. (1)
  3. (1)
  4. (1)
No up-shift (1st --> 2nd) 2nd brake (B3) (1)
No up-shift (2nd --> 3rd)
  1. 3rd brake (B2)
  2. One-way clutch No.1 (F1)
  1. (1)
  2. (1)
No up-shift (3rd --> 4th) Direct clutch (1)
No up-shift (4th --> 5th) O/D brake (B0) (1)
No lock-up or No lock-up off Torque converter clutch TORQUE CONVERTER
Harsh engagement (N --> D)
  1. Forward clutch (C1)
  2. O/D one-way clutch (F0)
  3. One-way clutch No.2 (F2)
  1. (1)
  2. (1)
  3. (1)
Harsh engagement (N --> R)
  1. Direct clutch (C2)
  2. O/D brake (B0)
  3. 1st & reverse brake (B4)
  1. (1)
  2. (1)
  3. (1)
Harsh engagement (1 --> 2) 2nd brake (B3) (1)
Harsh engagement (2 --> 3)
  1. 3rd brake (B2)
  2. 2nd brake (B3)
  3. One-way clutch No.1 (F1)
  1. (1)
  2. (1)
  3. (1)
Harsh engagement (3 --> 4) Direct clutch (C2) (1)
Harsh engagement (4 --> 5th)
  1. O/D brake (B0)
  2. O/D direct clutch (C0)
  1. (1)
  2. (1)
Harsh engagement (Lock-up) Torque converter clutch TORQUE CONVERTER
Slip or shudder (Forward and reverse: After warm-up)
  1. O/D one-way clutch (F0)
  2. O/D direct clutch (C0)
  3. Torque converter clutch
  1. (1)
  2. (1)
  3. TORQUE CONVERTER
Slip or shudder (Particular position: Just after engine starts) Torque converter clutch TORQUE CONVERTER
Slip or shudder (R position)
  1. Direct clutch (C2)
  2. O/D brake (B0)
  3. 1st & reverse brake (B4)
  1. (1)
  2. (1)
  3. (1)
Slip or shudder (1st)
  1. Forward clutch (C1)
  2. No. 2 one-way clutch (F2)
  1. (1)
  2. (1)
Slip or shudder (2nd) 2nd brake (B3) (1)
Slip or shudder (3rd)
  1. 3rd coast brake (B1)
  2. 3rd brake (B2)
  3. One-way clutch No. 1 (F1)
  1. (1)
  2. (1)
  3. (1)
Slip or shudder (4th) Direct clutch (1)
Slip or shudder (5th) O/D brake (B0) (1)
No engine braking (1st +/- 4th: D position) O/D direct clutch (C0) (1)
No engine braking (1st: L position) 1st & reverse brake (B4) (1)
No engine braking (2nd: 2 position) 2nd brake (B3) (1)
No engine braking (3rd: 3 position) 3rd coast brake (B1) (1)
Poor acceleration (All positions) Torque converter clutch TORQUE CONVERTER
Poor acceleration (5th)
  1. O/D brake (B0)
  2. O/D planetary gear unit
  1. (1)
  2. (1)
Engine stalls when starting off or stopping Torque converter clutch TORQUE CONVERTER
(1) A650E AUTOMATIC TRANSMISSION, refer to OVERHAUL - A-650E
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