Problem Symptoms Table

If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check the circuits for each symptom in the order given in the charts and proceed to 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 on matrix chart" is given in the flow chart of each circuit, proceed to the circuit with the next highest number in the table to continue the check.
• If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and replace the ECM.

1. Chapter 1: Electronic Circuit Matrix Chart 
   PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSMISSION - ELECTRONIC CIRCUIT MATRIX
   
   

   Symptom	Suspected Area
   No up-shift (1st → 2nd)	ECM
   No up-shift (2nd → 3rd)	ECM
   No up-shift (3rd → O/D)	O/D main switch circuit ECM
   No down-shift (O/D -4 3rd)	O/D main switch circuit ECM
   No down-shift (3rd → 2nd)	ECM
   No down-shift (2nd → 1st)	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 L position	ECM
   Up-shift to O/D from 3rd	O/D main switch circuit ECM
   Up-shift to O/D from 3rd while engine is cold	ECM
   Harsh engagement (N → D)	ECM
   Harsh engagement (Lock-up)	ECM
   Harsh engagement (Any driving position)	ECM
   Poor acceleration	ECM
   Large shift shock or engine stalls when starting off or stopping	ECM

2. Chapter 2: On-vehicle Repair 

   (*:  OVERHAUL - U140F  article ) 

   AUTOMATIC TRANSAXLE (U140F) (ON-VEHICLE REPAIR) - PROBLEM SYMPTOMS TABLE
   
   

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

3. Chapter 3: Off-vehicle Repair 

   (*:  OVERHAUL - U140F  article ) 

   AUTOMATIC TRANSAXLE (U140F) (OFF-VEHICLE REPAIR) - PROBLEM SYMPTOMS TABLE
   
   

   Symptom	Suspected Area	Go To
   Vehicle does not move in any forward positions and reverse positions	Front and rear planetary gear unit U/D planetary gear unit U/D one-way clutch (F2 ) Forward clutch (C1 ) U/D brake (B3 )	* * * * *
   Vehicle does not move in R position	Front and rear planetary gear unit U/D planetary gear unit Direct clutch (C2 ) U/D brake (C3 ) 1st and reverse brake (B2)	* * * * *
   No up-shift (1st -> 2nd)	No. 1 one-way clutch (F1 ) 2nd brake (B1 )	* *
   No up-shift (2nd -> 3rd)	Direct clutch (C2 )	*
   No up-shift (3rd -> O/D)	U/D clutch (C3 )	*
   No lock-up or No lock-up off	Torque converter clutch	*
   Harsh engagement (N -> D)	Forward clutch (C1 ) U/D one-way clutch (F2 ) No. 1 one-way clutch (F1 )	* * *
   Harsh engagement (N -> R)	Direct clutch (C2 ) 1st and reverse brake (B2 )	* *
   Harsh engagement (Lock-up)	Torque converter clutch	*
   Slip or shudder (Forward position: After warm-up)	Torque converter clutch Forward clutch (C1 ) Direct clutch (C2 ) U/D brake (C3 ) No. 1 one-way clutch (F1 ) U/D one-way clutch (F2 )	* * * * * *
   Slip or shudder (R position)	Direct clutch (C2 ) 1st and reverse brake (B2 )	* *
   Slip or shudder (1st)	No. 1 one-way clutch (F1)	*
   Slip or shudder (2nd)	U/D one-way clutch (F2 ) 2nd brake (B1 )	* *
   Slip or shudder (3rd)	Direct clutch (C2 )	*
   Slip or shudder (O/D)	U/D clutch (C3 )	*
   No engine braking (1st ~ 3rd: D position)	U/D brake (B3 )	*
   No engine braking (1st: L position)	1st and reverse brake (B2 )	*
   No engine braking (2nd: 2 position)	2nd brake (B1 )	*
   Poor acceleration (All position)	Torque converter clutch U/D planetary gear	* *
   Poor acceleration (O/D)	U/D clutch (C3 ) U/D planetary gear	* *
   Large shift shock or engine stalls when starting off or stopping	Torque converter clutch	*