A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: PROBLEM SYMPTOMS TABLE; 2006 MY LX470 [05/2005

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
The Matrix Chart is divided into 3 chapters. When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to 2 or 3, proceed as instructed.
If the instruction "Proceed to next circuit inspection shown on problem symptoms table" is given in the flowchart for each circuit, proceed to the next suspected area in the table.
If the problem still occurs even though there are no abnormalities in any of the circuits, check the ECM and replace it if necessary.

CHAPTER 1: ELECTRICAL CIRCUIT MATRIX CHART

Symptom

Suspected area

See page

No up-shift (a particular gear from 1st to 4th gear is not up-shifted)

1. Shift solenoid valve S1 circuit *

2. Shift solenoid valve S2 circuit *

3. ECM

No up-shift (4th -> 5th)

1. Transmission control switch circuit (D - 4) *

2. Engine coolant temp. sensor circuit *

3. Speed sensor NT circuit *

4. Shift solenoid valve SL1 circuit *

5. Shift solenoid valve SL2 circuit *

6. Shift solenoid valve SR circuit *

7. ECM

No up-shift (3rd -> 4th)

1. Engine coolant temp. sensor circuit *

2. Shift solenoid valve S2 circuit *

3. ECM

No up-shift (1st -> 2nd)

1. Transmission control switch circuit (2 - L) *

2. Shift solenoid valve S2 circuit *

3. ECM

No down-shift (5th -> 4th)

1. Transmission control switch circuit (D - 4) *

2. Shift solenoid valve SL1 circuit *

3. Shift solenoid valve SL2 circuit *

4. Shift solenoid valve SR circuit *

5. ECM

No down-shift (2nd -> 1st)

1. Transmission control switch circuit (2 - L) *

2. Shift solenoid valve S2 circuit *

3. ECM

No down-shift (a particular gear from 1st to 4th gear is not down-shifted)

1. Shift solenoid valve S1 circuit *

2. Shift solenoid valve S2 circuit *

3. ECM

No lock-up

1. ATF temperature sensor circuit *

2. Transfer L4 position switch circuit *

3. Stop light switch circuit *

4. Speed sensor NT circuit *

5. Shift solenoid valve SLU circuit *

6. ECM

No lock-up off

ECM

Shift point too high or too low

1. Shift solenoid valve SLT circuit *

2. Speed sensor NT circuit *

3. Speed sensor SP2 circuit *

4. Throttle position sensor circuit *

5. ATF temperature sensor circuit *

6. Pattern select switch circuit (PWR mode switch)

7. Transfer L4 position switch circuit *

8. ECM

Up-shift to 5th from 4th while shift lever on 4

1. Transmission control switch circuit (D - 4) *

2. ECM

Up-shift to 5th from 4th while engine is cold

1. Engine coolant temp. sensor circuit *

2. ECM

Up-shift to 4th from 3rd while shift lever on 3

1. Park/Neutral position switch circuit *

2. ECM

Up-shift to 3rd from 2nd while shift lever on 2

1. Park/Neutral position switch circuit *

2. ECM

Up-shift to 2nd from 1st while shift lever on L

1. Transmission control switch circuit (2 - L) *

2. ECM

Harsh engagement (N -> D)

1. Speed sensor NT circuit *

2. Shift solenoid valve SL1 circuit *

3. Shift solenoid valve SLT circuit *

4. ECM

Harsh engagement (Lock-up)

1. Speed sensor NT circuit *

2. Speed sensor SP2 circuit *

3. Shift solenoid valve SLU circuit *

4. ECM

Harsh engagement (any driving position)

ECM

Poor acceleration

1. No. 2 ATF temperature sensor circuit *

2. ECM

No engine braking

ECM

No kick-down

ECM

Engine stalls when starting off or stopping

1. Shift solenoid valve SLU circuit *

2. ECM

No pattern select (PWR)

1. Pattern select switch circuit (PWR mode switch)

2. ECM

No 2nd start

1. Pattern select switch circuit (2nd start switch)

2. Transmission control switch circuit (2 - L) *

3. ECM

AT oil temp. warning light remains on

1. No. 2 ATF temperature sensor circuit *

2. ECM

Lock-up at 3rd gear

1. No. 2 ATF temperature sensor circuit *

2. ECM

Shift point too high

1. No. 2 ATF temperature sensor circuit *

2. ECM

A/T P indicator light does not illuminate

1. A/T P indicator light circuit

2. Combination meter circuit

3. ECM

HINT:

*: When the circuit is defective, a DTC may be output.

CHAPTER 2: ON-VEHICLE REPAIR AND OFF-VEHICLE REPAIR

Symptom

Suspected area

See page

Vehicle does not move in all positions other than P and N

1. Transmission control cable

2. Manual valve

3. Parking lock pawl

4. Off-vehicle repair matrix chart

Vehicle does not move with shift lever on R

1. Valve body assembly

2. Off-vehicle repair matrix chart

No up-shift (1st -> 2nd)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No up-shift (2nd -> 3rd)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No up-shift (3rd -> 4th)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No up-shift (4th -> 5th)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No down-shift (5th -> 4th)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No down-shift (4th -> 3rd)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No down-shift (3rd -> 2nd)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No down-shift (2nd -> 1st)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No lock-up or no lock-up off

1. Shift solenoid valve SLU

2. Valve body assembly

3. Off-vehicle repair matrix chart

Harsh engagement (N -> D)

1. Shift solenoid valve SL1

2. Valve body assembly

3. C1 accumulator

4. Off-vehicle repair matrix chart

Harsh engagement (Lock-up)

1. Shift solenoid valve SLU

2. Valve body assembly

3. Off-vehicle repair matrix chart

Harsh engagement (N -> R)

1. Shift solenoid valve SLT

2. Shift solenoid valve SLU

3. Valve body assembly

4. C3 accumulator

5. Off-vehicle repair matrix chart

Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th)

1. Shift solenoid valve SLT

2. Shift solenoid valve SL1

3. Valve body assembly

Harsh engagement (1st -> 2nd)

1. Valve body assembly

2. B3 accumulator

3. Off-vehicle repair matrix chart

Harsh engagement (2nd -> 3rd)

1. Valve body assembly

2. C3 accumulator

3. Off-vehicle repair matrix chart

Harsh engagement (3rd -> 4th)

1. Valve body assembly

2. C2 accumulator

3. Off-vehicle repair matrix chart

Harsh engagement (4th -> 5th)

1. Shift solenoid valve SL1

2. Shift solenoid valve SL2

3. Valve body assembly

4. Off-vehicle repair matrix chart

Harsh engagement (5th -> 4th)

1. Shift solenoid valve SL1

2. Shift solenoid valve SL2

3. Valve body assembly

4. Off-vehicle repair matrix chart

Slip or shudder (forward and reverse)

1. Transmission control rod

2. Valve body assembly

3. Oil strainer

4. Off-vehicle repair matrix chart

No engine braking (1st/shift lever on L)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No engine braking (2nd/shift lever on 2)

1. Valve body assembly

2. Off-vehicle repair matrix chart

No kick-down

Valve body assembly

Shift point too high or too low

1. Shift solenoid valve SLT

2. Shift solenoid valve SL1

3. Valve body assembly

Poor acceleration

1. Shift solenoid valve SLT

2. Valve body assembly

Engine stalls when starting off or stopping

1. Shift solenoid valve SLU

2. Valve body assembly

CHAPTER 3: OFF-VEHICLE REPAIR

Symptom

Suspected area

See page

Vehicle does not move in all positions other than P and N

1. Repair planetary gear unit

2. Torque converter clutch

Vehicle does not move with shift lever on R

1. B4 Brake

2. C3 Clutch

3. F1 one-way clutch

No up-shift (1st -> 2nd)

1. B3 Brake

2. F1 one-way clutch

3. F2 one-way clutch

No up-shift (2nd -> 3rd)

C3 Clutch

No up-shift (3rd -> 4th)

C2 Clutch

No up-shift (4th -> 5th)

1. B1 Brake

2. C1 Clutch

No lock-up or no lock-up off

Torque converter clutch

Harsh engagement (N -> D)

1. C1 Clutch

2. F3 one-way clutch

Harsh engagement (N -> R)

1. C3 Clutch

2. B4 Brake

3. F1 one-way clutch

Harsh engagement (1 -> 2)

1. B3 Brake

2. F1 one-way clutch

3. F2 one-way clutch

Harsh engagement (2 -> 3)

C3 Clutch

Harsh engagement (3 -> 4)

C2 Clutch

Harsh engagement (4 -> 5)

1. B1 Brake

2. C1 Clutch

Harsh engagement (lock-up)

Torque converter clutch

Slip or shudder (forward and reverse: after warm-up)

1. F1 one-way clutch

2. C3 Clutch

3. Torque converter clutch

Slip or shudder (particular position: just after engine starts)

Torque converter clutch

Slip or shudder (shift lever on R)

1. B4 Brake

2. F1 one-way clutch

3. C3 Clutch

Slip or shudder (1st)

1. C1 Clutch

2. F3 one-way clutch

Slip or shudder (2nd)

1. C1 Clutch

2. B3 Brake

3. F1 one-way clutch

4. F2 one-way clutch

Slip or shudder (3rd)

1. C1 Clutch

2. C3 Clutch

3. F1 one-way clutch

Slip or shudder (4th)

1. C1 Clutch

2. C2 Clutch

Slip or shudder (5th)

1. C2 Clutch

2. C3 Clutch

3. B1 Brake

No engine braking (1st +- 4th/shift lever on D)

C1 Clutch

No engine braking (1st/shift lever on L)

B4 Brake

No engine braking (2nd/shift lever on 2)

B2 Brake

No engine braking (3rd/shift lever on 3)

B1 Brake

No engine braking (all shift lever positions)

Torque converter clutch

Poor acceleration (5th)

1. C1 Clutch

2. C3 Clutch

3. B1 Brake

4. Front planetary gear unit

Engine stalls when starting off or stopping

Torque converter clutch