ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM

1. Chapter 1: Electronic Circuit Matrix Chart.
Refer to the table below when the trouble cause is considered to be electrical.

If the instruction "Proceed to next circuit inspection shown on matrix chart" is given in the flowchart of each circuit, proceed to the circuit with the next suspected area 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.
Symptom	Suspected Area	See page
No up-shift (1st -> 2nd)	ECM	Click here
No up-shift (2nd -> 3rd)	ECM	Click here
No up-shift (3rd -> 4th)	1. Transmission control switch circuit *1	Click here
No up-shift (3rd -> 4th)	2. ECM	Click here
No down-shift (4th -> 3rd)	1. Transmission control switch circuit *1	Click here
No down-shift (4th -> 3rd)	2. ECM	Click here
No down-shift (3rd -> 2nd)	ECM	Click here
No down-shift (2nd -> 1st)	ECM	Click here
No lock-up or No lock-up off	1. Stop light switch circuit *1	Click here
	2. Engine coolant temp. sensor circuit (w/ Secondary air injection) *1	Click here
	3. Engine coolant temp. sensor circuit (w/o Secondary air injection)*1	Click here
	4. ECM	Click here
Shift point too high or too low	ECM	Click here
Up-shift to 2nd while in L position	1. Park/neutral position switch circuit *1	Click here
Up-shift to 2nd while in L position	2. ECM	Click here
Up-shift to 3rd while in 2 position	1. Park/neutral position switch circuit *1	Click here
Up-shift to 3rd while in 2 position	2. ECM	Click here
Up-shift to 4th from 3rd while shift lever is 3 position	1. Transmission control switch circuit *1	Click here
Up-shift to 4th from 3rd while shift lever is 3 position	2. ECM	Click here
Up-shift to 4th from 3rd while engine is cold	ECM	Click here
Poor acceleration	ECM	Click here
No kick-down	ECM	Click here
Engine stalls when starting off or stopping	ECM	Click here
Malfunction in shifting	1. Park/neutral position switch circuit *1	Click here
Malfunction in shifting	2. ECM	Click here

2. Chapter 2: On-Vehicle Repair
Symptom	Suspected Area	See page
Vehicle does not move in any forward position and reverse position	1. Shift solenoid valve SLT	Click here
	2. Transmission control cable	Click here
	3. Manual valve	Click here
	4. Parking lock pawl	Click here
	5. Off-vehicle repair matrix chart	-
Vehicle does not move in R position	Off-vehicle repair matrix chart	-
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	Click here
No up-shift (1st -> 2nd)	2. Off-vehicle repair matrix chart	-
No up-shift (2nd -> 3rd)	1. 2-3 shift valve	Click here
No up-shift (2nd -> 3rd)	2. Off-vehicle repair matrix chart	-
No up-shift (3rd -> 4th)	1. 3-4 shift valve	Click here
No up-shift (3rd -> 4th)	2. Off-vehicle repair matrix chart	-
No down-shift (4th -> 3rd)	1. 3-4 shift valve	Click here
No down-shift (4th -> 3rd)	2. Off-vehicle repair matrix chart	-
No down-shift (3rd -> 2nd)	1. 2-3 shift valve	Click here
No down-shift (3rd -> 2nd)	2. Off-vehicle repair matrix chart	-
No down-shift (2nd -> 1st)	1. 1-2 shift valve	Click here
No down-shift (2nd -> 1st)	2. Off-vehicle repair matrix chart	-
No lock-up or No lock-up off	1. Lock-up control valve	Click here
	2. Lock-up relay valve	Click here
	3. Off-vehicle repair matrix chart	-
Harsh engagement (N -> D)	1. Accumulator control valve	Click here
Harsh engagement (N -> D)	2. Off-vehicle repair matrix chart	-
Harsh engagement (Lock-up)	1. Lock-up control valve	Click here
	2. Lock-up relay valve	Click here
	3. Off-vehicle repair matrix chart	-
Harsh engagement (N -> R)	1. Accumulator control valve	Click here
	2. C2 accumulator	Click here
	3. Off-vehicle repair matrix chart	-
Harsh engagement (N -> L)	Low coast modulator valve	Click here
Harsh engagement (1st -> 2nd / D position)	1. Accumulator control valve	Click here
Harsh engagement (1st -> 2nd / D position)	2. B2 accumulator	Click here
Harsh engagement (1st -> 2nd / 2 position)	1. Accumulator control valve	Click here
Harsh engagement (1st -> 2nd / 2 position)	2. B2 accumulator	Click here
Harsh engagement (1st -> 2nd -> 3rd -> 4th)	1. Accumulator control valve	Click here
Harsh engagement (1st -> 2nd -> 3rd -> 4th)	2. Throttle valve	-
Harsh engagement (2nd -> 3rd)	1. Accumulator control valve	Click here
	2. C2 accumulator	Click here
	3. Off-vehicle repair matrix chart	-
Harsh engagement (3rd -> 4th)	1. Accumulator control valve	Click here
	2. Solenoid modulator valve	Click here
	3. Off-vehicle repair matrix chart	-
Harsh engagement (4th -> 3rd)	1. Accumulator control valve	Click here
	2. C0 accumulator	Click here
	3. Off-vehicle repair matrix chart	-
Slip or shudder (Forward and reverse)	1. Shift solenoid valve SLT	Click here
	2. Transmission control cable	Click here
	3. Oil strainer	Click here
	4. Pressure relief valve	Click here
	5. Off-vehicle repair matrix chart	-
Slip or shudder (Particular position)	1. Shift solenoid valve SLT	Click here
	2. Transmission control cable	Click here
	3. Off-vehicle repair matrix chart	-
No engine braking (1st / L position)	1. Low coast modulator valve	Click here
No engine braking (1st / L position)	2. Off-vehicle repair matrix chart	-
No engine braking (2nd / 2 position)	1. 2nd coast modulator valve	Click here
No engine braking (2nd / 2 position)	2. Off-vehicle repair matrix chart	-
No kick-down	1. 1-2 shift valve	Click here
No kick-down	2. 2-3 shift valve	Click here

3. Chapter 3: Off-Vehicle Repair
Symptom	Suspected Area	See page
Vehicle does not move in any forward position and reverse position	1. O/D one-way clutch (F0)	Click here
	2. O/D direct clutch (C0)	Click here
	3. O/D brake (B0)	Click here
	4. O/D planetary gear unit	Click here
	5. Torque converter clutch	Click here
Vehicle does not move in R position	1. 2nd coast brake (B1)	Click here
	2. Front and rear planetary gear unit	Click here
	3. Direct clutch (C2)	Click here
	4. 1st & reverse brake (B3)	Click here
	5. O/D direct clutch (C0)	Click here
Vehicle does not move in D, 2 and L positions	Forward clutch (C2)	Click here
Vehicle does not move in D and 2 positions	No.2 one-way clutch (F2)	Click here
Vehicle does not move in 2 position	1st & reverse (B3)	Click here
Vehicle does not move in L position	1. 2nd brake (B2)	Click here
	2. 2nd coast brake (B1)	Click here
	3. Direct clutch (C2)	Click here
No up-shift (1st -> 2nd)	1. 2nd brake (B2)	Click here
No up-shift (1st -> 2nd)	2. No.1 one-way clutch (F1)	Click here
No up-shift (2nd -> 3rd)	Direct clutch (C2)	Click here
No up-shift (3rd -> 4th)	O/D brake (B0)	Click here
No down-shift (2nd -> 1st)	1. 2nd coast brake (B1)	Click here
No down-shift (2nd -> 1st)	2. 2nd brake (B2)	Click here
No lock-up or No lock-up off	Torque converter clutch	Click here
Harsh engagement (N -> D)	Forward clutch (C1)	Click here
Harsh engagement (N -> R)	1. Direct clutch (C2)	Click here
Harsh engagement (N -> R)	2. 1st & reverse brake (B3)	Click here
Harsh engagement (2nd -> 3rd)	2nd coast brake (B1)	Click here
Harsh engagement (3rd -> 4th)	1. O/D direct clutch (C0)	Click here
	2. O/D brake (B0)	Click here
	3. O/D planetary gear unit	Click here
Harsh engagement (4th -> 3rd)	O/D brake (B0)	Click here
Harsh engagement (Lock-up)	Torque converter clutch	Click here
Slip or shudder (Forward and reverse / After warm-up)	1. Torque converter clutch	Click here
	2. O/D one-way clutch (F0)	Click here
	3. O/D direct clutch (C0)	Click here
Slip or shudder (Forward and reverse / Just after engine starts)	Torque converter clutch	Click here
Slip or shudder (R position)	1. Direct clutch (C2)	Click here
Slip or shudder (R position)	2. 1st & reverse brake (B3)	Click here
Slip or shudder (1st)	1. Forward clutch (C1)	Click here
Slip or shudder (1st)	2. No.2 one-way clutch (F2)	Click here
Slip or shudder (2nd)	1. 2nd brake (B2)	Click here
	2. 2nd coast brake (B1)	Click here
	3. No.1 one-way clutch (F1)	Click here
Slip or shudder (3rd)	Direct clutch (C2)	Click here
Slip or shudder (4th)	O/D brake (B0)	Click here
No engine braking (1st - 3rd: D position)	O/D direct clutch (C0)	Click here
No engine braking (1st: L position)	1st & reverse brake (B3)	Click here
No engine braking (2nd: 2 position)	2nd coast brake (B1)	Click here
Poor acceleration (All position)	Torque converter clutch	Click here
Poor acceleration (4th)	1. O/D direct clutch (C0)	Click here
Poor acceleration (4th)	2. O/D planetary gear unit	Click here
Poor acceleration (other than 4th)	O/D brake (B0)	Click here
Poor acceleration (other than 2nd)	1. 2nd coast brake (B1)	Click here
Poor acceleration (other than 2nd)	2. 2nd brake (B2)	Click here
Poor acceleration (1st and 2nd)	Direct clutch (C2)	Click here
Poor acceleration (L and R positions)	1st & reverse brake (B3)	Click here
Poor acceleration (R position)	Forward clutch (C1)	Click here
Engine stalls when starting off or stopping	Torque converter clutch	Click here

ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM PROBLEM SYMPTOMS TABLE