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Home >> Lexus >> 2003 >> GS 430 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - Diagnostics >> Problem Symptoms Table >> Category 2: On-Vehicle Repair
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Category 2: On-Vehicle Repair

SUSPECT AREA

Symptom Suspect Area Action
Vehicle does not move in any forward position and reverse positions
  1. Transmission control rod
  2. Manual valve
  3. Parking lock pawl
  4. Off-vehicle repair matrix chart
  1. PRE-CHECK 
  2. (1)
  3. (1)
  4. (1)
  5. -
Vehicle does not move in R position
  1. Reverse control valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
Vehicle does not move in particular position or positions (Except R position) Off-vehicle repair matrix chart -
No up-shift (1st --> 2nd)
  1. 1-2 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No up-shift (2nd --> 3rd)
  1. 2-3 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No up-shift (3rd --> 4th)
  1. 3-4 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No up-shift (4th --> 5th)
  1. 4-5 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No down-shift (5th --> 4th)
  1. 4-5 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No down-shift (4th --> 3rd)
  1. 3-4 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No down-shift (3rd --> 2nd)
  1. 2-3 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No down-shift (2nd --> 1st)
  1. 1-2 shift valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No lock-up or No lock-up off
  1. Lock-up control valve
  2. Lock-up relay valve
  3. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. -
Harsh engagement (N --> D)
  1. Accumulator control valve
  2. Solenoid modulator valve
  3. C1 accumulator
  4. Orifice control valve
  5. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. (1)
  5. -
Harsh engagement (Lock-up)
  1. Lock-up control valve
  2. Lock-up relay valve
  3. Solenoid relay valve
  4. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. -
Harsh engagement (N --> R)
  1. Accumulator control valve
  2. C2 accumulator
  3. Solenoid modulator valve
  4. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. -
Harsh engagement (2 --> L) Coast brake control valve (1)
Harsh engagement (2nd --> 3rd --> 4th --> 5th)
  1. Accumulator control valve
  2. Solenoid modulator valve
  1. (1)
  2. (1)
Harsh engagement (1st --> 2nd)
  1. Solenoid modulator valve
  2. B3 control valve
  3. B2 release control valve
  4. Solenoid relay valve
  5. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. (1)
  5. -
Harsh engagement (2nd --> 3rd)
  1. Accumulator control valve
  2. Solenoid modulator valve
  3. B2 accumulator
  4. B3 control valve
  5. B2 release control valve
  6. Solenoid relay valve
  7. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. (1)
  5. (1)
  6. (1)
  7. -
Harsh engagement (3rd --> 4th)
  1. Accumulator control valve
  2. Solenoid modulator valve
  3. C2 accumulator
  4. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. -
Harsh engagement (4th --> 5th)
  1. Accumulator control valve
  2. Solenoid modulator valve
  3. B0 accumulator
  4. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. -
Harsh engagement (5th --> 4th)
  1. Accumulator control valve
  2. Solenoid modulator valve
  3. C0 accumulator
  4. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. (1)
  4. -
Slip or shudder (Forward and reverse)
  1. Transmission control rod
  2. Oil strainer
  3. Pressure relief valve
  4. Off-vehicle repair matrix chart
  1. PRE-CHECK 
  2. (1)
  3. (1)
  4. -
Slip or shudder (Particular position)
  1. Transmission control rod
  2. Off-vehicle repair matrix chart
  1. PRE-CHECK 
  2. -
No engine braking (1st: L position)
  1. Coast brake control valve
  2. B-4 relay valve
  3. Off-vehicle repair matrix chart
  1. (1)
  2. (1)
  3. -
No engine braking (2nd: 2 position)
  1. Coast brake control valve
  2. Off-vehicle repair matrix chart
  1. (1)
  2. -
No kick-down
  1. 1-2 shift valve
  2. 2-3 shift valve
  3. 3-4 shift valve
  1. (1)
  2. (1)
  3. (1)
(1) A650E AUTOMATIC TRANSMISSION, refer to OVERHAUL - A-650E
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