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Problem Symptoms Table

If a normal code is displayed during DTC check but the trouble still occurs, check the circuits for each symptom in the order given in the charts on the following pages and proceed to the page given for troubleshooting. The matrix chart is divided into 3 chapters.

Chapter 1: Electronic circuit matrix chart 

Chapter 2: On-vehicle repair matrix chart 

Chapter 3: Off-vehicle repair matrix chart 

If the instruction "Proceed to next circuit inspection shown in matrix chart" is given in the flow chart for each circuit, proceed to the circuit with the next highest number in the chart to continue the check.

If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check and replace the ECM.

Chapter 1: Electronic circuit matrix chart 

PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSMISSION - ELECTRONIC CIRCUIT MATRIX

Symptom Suspected Area
No up-shift (A particular gear, from 1st to 3rd gear, is not up-shifted) ECM
No upshift (3rd → O/D)
  1. O/D main switch & O/D OFF indicator light circuit
  2. O/D cancel signal circuit
  3. ECM
No down-shift (O/D → 3rd) ECM
No down-shift (A particular gear, from 3rd to 1st gear, is not down-shifted)
  1. O/D main switch circuit
  2. ECM
No lock-up or No lock-up off ECM
Shift point too high or too low ECM
Up-shift to 2nd while in L position ECM
Up-shift to 3rd while in 2 position ECM
Up-shift to O/D from 3rd while O/D main switch is OFF
  1. O/D main switch & O/D OFF indicator light circuit
  2. ECM
Up-shift to O/D from 3rd while engine is cold ECM
Harsh engagement (N → D) ECM
Harsh engagement (Any driving position) ECM
Poor acceleration ECM
Engine stalls when starting off or stopping ECM
No kick-down ECM

Chapter 2: On-vehicle repair 

See appropriate AUTOMATIC TRANSMISSION OVERHAUL article 

PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSMISSION - ON-VEHICLE REPAIR

Symptom Suspected Area
Vehicle does not move in any forward position and reverse position
  1. Manual valve
  2. Throttle valve
  3. Primary regulator valve
  4. Off-vehicle repair matrix chart
Vehicle does not move in R position Off-vehicle repair matrix chart
No up-shift (1st → 2nd)
  1. 1-2 shift valve
  2. Off-vehicle repair matrix chart
No up-shift (2nd → 3rd)
  1. 2-3 shift valve
  2. Off-vehicle repair matrix chart
No up-shift (3rd → O/D)
  1. 3-4 shift valve
  2. Off-vehicle repair matrix chart
No down-shift (O/D → 3rd) 3-4 shift valve
No down-shift (3rd → 2nd) 2-3 shift valve
No down-shift (2nd → 1st) 1-2 shift valve
No lock-up or No lock-up off
  1. Lock-up relay valve
  2. Off-vehicle repair matrix chart
Harsh engagement (N → D)
  1. C1 accumulator
  2. Off-vehicle repair matrix chart
Harsh engagement (N → R)
  1. C2 accumulator
  2. No. 1 accumulator control valve
  3. Off-vehicle repair matrix chart
Harsh engagement (N → L) Low coast modulator valve
Harsh engagement (Lock-up)
  1. Lock-up relay valve
  2. Off-vehicle repair matrix chart
Harsh engagement (1st → 2nd → 3rd → O/D)
  1. Throttle modulator valve
  2. Cut back valve
  3. Throttle valve
Harsh engagement (2nd → 3rd) C2 accumulator
Harsh engagement (3rd → O/D) B0 accumulator
Harsh engagement (O/D → 3rd)
  1. C0 accumulator
  2. B0 accumulator
Slip or shudder (Forward and reverse)
  1. Throttle valve
  2. Oil strainer
  3. Off-vehicle repair matrix chart
No engine braking (1st: L position)
  1. Low coast modulator valve
  2. Off-vehicle repair matrix chart
No engine braking (2nd: 2 position)
  1. 2nd coast modulator valve
  2. Off-vehicle repair matrix chart
No kick-down
  1. 1-2 shift valve
  2. 2-3 shift valve
  3. 3-4 shift valve

Chapter 3: Off-vehicle repair 

See appropriate AUTOMATIC TRANSMISSION OVERHAUL article 

PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSMISSION - OFF-VEHICLE REPAIR

Symptom Suspected Area
Vehicle does not move in any forward position and reverse position
  1. Front and rear planetary gear
  2. O/D planetary gear
  3. O/D one-way clutch (F0 )
  4. O/D direct clutch (C0 )
  5. Forward clutch (C1 )
  6. O/D brake (B0 )
Vehicle does not move in R position
  1. Front and rear planetary gear unit
  2. Direct clutch (C2 )
  3. O/D direct clutch (C0 )
  4. 1st & reverse brake (B3 )
No up-shift (1st → 2nd)
  1. No. 1 one-way clutch (F1 )
  2. 2nd brake (B2 )
No up-shift (2nd → 3rd) Direct clutch (C2 )
No up-shift (3rd → O/D) O/D brake (B0 )
No lock-up or No lock-up off Torque converter clutch
Harsh engagement (N → D)
  1. Forward clutch (C1 )
  2. O/D one-way clutch (F0 )
  3. No. 2 one-way clutch (F2 )
Harsh engagement (N → R)
  1. Direct clutch (C2 )
  2. 1st & reverse brake (B3 )
Harsh engagement (Lock-up) Torque converter clutch
Slip or shudder (Forward position: After warm-up)
  1. Torque converter clutch
  2. O/D direct clutch (C0 )
  3. Forward clutch (C1 )
  4. O/D one-way clutch (F0 )
Slip or shudder (R position)
  1. Direct clutch (C2 )
  2. 1st & reverse brake (B3 )
  3. O/D direct clutch (C0 )
Slip or shudder (1st) No. 2 one-way clutch (F2 )
Slip or shudder (2nd)
  1. No. 1 one-way clutch (F1 )
  2. 2nd brake (B2 )
Slip or shudder (3rd) Direct clutch (C2 )
Slip or shudder (O/D) O/D brake (B0 )
No engine braking (1st - 3rd: D position) 2nd brake (B2 )
No engine braking (1st: L position) 1st & reverse brake (B3 )
No engine braking (2nd: 2 position) 2nd coast brake (B1 )
Poor acceleration (All position)
  1. Torque converter clutch
  2. O/D planetary gear
Poor acceleration (O/D)
  1. O/D direct clutch (C0 )
  2. O/D planetary gear
Large shift shock or engine stalls when starting off or stopping Torque converter clutch
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