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DI-171
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI0CO-13
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code 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
S 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 table to continue the check.
S 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
Symptom Suspect Area See page
No up-shift (A particular gear, from 1st to 3rd gear, is not up-shift) ECM IN-31
3. O/D main switch & O/D OFF indicator light circuit DI-204
No up-shift (3rd O/D) 4. O/D cancel signal circuit DI-201
5. ECM IN-31
No down-shift (O/D 3rd) ECM IN-31
No down-shift (A particular gear, from 1st to 3rd gear, is not up-
ECM IN-31
shift)
No lock-up or No lock-up off ECM IN-31
Shift point too high or too low ECM IN-31
Up-shift to 2nd while in L position ECM IN-31
Up-shift to 3rd while in 2 position ECM IN-31
1. O/D main switch & O/D OFF indicator light circuit DI-204
Up-shift to O/D from 3rd
2. ECM IN-31
Up-shift to O/D from 3rd while engine is cold ECM IN-31
Harsh engagement (N D) ECM IN-31
Harsh engagement (Any driving position) ECM IN-31
Poor acceleration ECM IN-31
Engine stalls when starting off or stopping ECM IN-31
No kick-down ECM IN-31
2001 SIENNA (RM787U)
Author : Date : 325
DI-172
DIAGNOSTICS - AUTOMATIC TRANSAXLE
Chapter 2: On-vehicle repair
(L: A541E automatic transaxle repair manual Pub. No. RM326U)
Symptom Suspect Area See page
1. Manual valve L
Vehicle does not move in any forward position and reverse posi- 2. Throttle valve L
tion 3. Primary regulator valve L
4. Off-vehicle repair matrix chart -
Vehicle does not move in R position Off-vehicle repair matrix chart -
1. 1-2 shift valve L
No up-shift (1st 2nd)
2. Off-vehicle repair matrix chart -
1. 2-3 shift valve L
No up-shift (2nd 3rd)
2. Off-vehicle repair matrix chart -
1. 3-4 shift valve L
No up-shift (3rd O/D)
2. Off-vehicle repair matrix chart -
No down-shift (O/D 3rd) 3-4 shift valve L
No down-shift (3rd 2nd) 2-3 shift valve L
No down-shift (2nd 1st) 1-2 shift valve L
1. Lock-up relay valve L
No lock-up or No lock-up off
2. Off-vehicle repair matrix chart -
1. C1 accumulator L
Harsh engagement (N D)
2. Off-vehicle repair matrix chart -
1. C2 accumulator L
Harsh engagement (N R) 2. No.1 accumulator control valve L
3. Off-vehicle repair matrix chart -
Harsh engagement (N L) Low coast modulator valve L
1. Lock-up relay valve L
Harsh engagement (Lock-up)
2. Off-vehicle repair matrix chart -
1. Throttle modulator valve L
Harsh engagement (1st 2nd 3rd O/D) 2. Cut back valve L
3. Throttle valve L
Harsh engagement (2nd 3rd) C2 accumulator L
Harsh engagement (3rd O/D) B0 accumulator L
1. C0 accumulator L
Harsh engagement (O/D 3rd)
2. B0 accumulator L
1. Throttle valve L
Slip or shudder (Forward and reverse) 2. Oil strainer L
3. Off-vehicle repair matrix chart -
1. Low coast modulator valve L
No engine braking (1st: L position)
2. Off-vehicle repair matrix chart -
1. 2nd coast modulator valve L
No engine braking (2nd: 2 position)
2. Off-vehicle repair matrix chart -
1. 1-2 shift valve L
No kick-down 2. 2-3 shift valve L
3. 3-4 shift valve L
2001 SIENNA (RM787U)
Author : Date : 326
DI-173
DIAGNOSTICS - AUTOMATIC TRANSAXLE
Chapter 3: Off-vehicle repair
(L: A541E automatic transaxle repair manual Pub. No. RM326U)
Symptom Suspect Area See page
1. Front and rear planetary gear L
2. O/D planetary gear L
Vehicle does not move in any forward position and reverse posi- 3. O/D one-way clutch (F0) L
tion 4. O/D direct clutch (C0) L
5. Forward clutch (C1) L
6. O/D brake (B0) L
1. Front and rear planetary gear unit L
2. Direct clutch (C2) L
Vehicle does not move in R position
3. O/D direct clutch (C0) L
4. 1st & reverse brake (B3) L
1. No. 1 one-way clutch (F1) L
No up-shift (1st 2nd)
2. 2nd brake (B2) L
No up-shift (2nd 3rd) Direct clutch (C2) L
No up-shift (3rd O/D) O/D brake (B0) L
No lock-up or No lock-up off Torque converter clutch L
1. Forward clutch (C1) L
Harsh engagement (N D) 2. O/D one-way clutch (F0) L
3. No. 2 one-way clutch (F2) L
1. Direct clutch (C2) L
Harsh engagement (N R)
2. 1st & reverse brake (B3) L
Harsh engagement (Lock-up) Torque converter clutch L
1. Torque converter clutch L
2. O/D direct clutch (C0) L
Slip or shudder (Forward position: After warm-up)
3. Forward clutch (C1) L
4. O/D one-way clutch (F0) L
1. Direct clutch (C2) L
Slip or shudder (R position) 2. 1st & reverse brake (B3) L
3. O/D direct clutch (C0) L
Slip or shudder (1st) No. 2 one-way clutch (F2) L
1. No. 1 one-way clutch (F1) L
Slip or shudder (2nd)
2. 2nd brake (B2) L
Slip or shudder (3rd) Direct clutch (C2) L
Slip or shudder (O/D) O/D brake (B0) L
No engine braking (1st 3rd: D position) 2nd brake (B2) L
No engine braking (1st: L position) 1st & reverse brake (B3) L
No engine braking (2nd: 2 position) 2nd coast brake (B1) L
1. Torque converter clutch L
Poor acceleration (All position)
2. O/D planetary gear L
1. O/D direct clutch (C0) L
Poor acceleration (O/D)
2. O/D planetary gear L
Large shift shock or engine stalls when starting off or stopping Torque converter clutch L
2001 SIENNA (RM787U)
Author : Date : 327
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