Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2007 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

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 2 chapters.
If the instruction "Proceed to next circuit inspection shown in 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 malfunctions in any of the circuits, check the ECM and replace it if necessary.

CHAPTER 1: ELECTRONIC CIRCUIT MATRIX CHART

PROBLEM SYMPTOM CHART

Symptom	Suspected area	See
No up-shift (1st -> 2nd)	1. Shift solenoid valve S1 circuit*	DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1); DTC P0974 SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S1)
No up-shift (1st -> 2nd)	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No up-shift (2nd -> 3rd)	1. Shift solenoid valve S2 circuit*	DTC P0976 SHIFT SOLENOID "B" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S2); DTC P0977 SHIFT SOLENOID "B" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S2)
No up-shift (2nd -> 3rd)	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No up-shift (3rd -> 4th)	1. Shift solenoid valve S3 circuit*	DTC P0979 SHIFT SOLENOID "C" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S3); DTC P0980 SHIFT SOLENOID "C" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S3)
	2. Engine coolant temperature sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No up-shift (4th -> 5th)	1. Shift solenoid valve S4 circuit*	DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1); DTC P0974 SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S1)
	2. Shift solenoid valve SR circuit*	DTC P0985 SHIFT SOLENOID "E" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE SR); DTC P0986 SHIFT SOLENOID "E" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE SR)
	3. Shift solenoid valve SL1 circuit*	DTC P0748 PRESSURE CONTROL SOLENOID "A" ELECTRICAL (SHIFT SOLENOID VALVE SL1)
	4. Shift solenoid valve SL2 circuit*	DTC P0778 PRESSURE CONTROL SOLENOID "B" ELECTRICAL (SHIFT SOLENOID VALVE SL2)
	5. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No up-shift (5th -> 6th)	1. Park/Neutral position switch circuit*	DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850 PARK / NEUTRAL SWITCH INPUT CIRCUIT
	2. Engine coolant temperature sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
	3. Shift solenoid valve S2 circuit*	DTC P0976 SHIFT SOLENOID "B" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S2); DTC P0977 SHIFT SOLENOID "B" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S2)
	4. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No down-shift (6th -> 5th)	1. Park/Neutral position switch circuit*	DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850 PARK / NEUTRAL SWITCH INPUT CIRCUIT
	2. Shift solenoid valve S2 circuit*	DTC P0976 SHIFT SOLENOID "B" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S2); DTC P0977 SHIFT SOLENOID "B" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S2)
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No down-shift (5th -> 4th)	1. Shift solenoid valve S4 circuit*	DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1); DTC P0974 SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S1)
	2. Shift solenoid valve SR circuit*	DTC P0985 SHIFT SOLENOID "E" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE SR); DTC P0986 SHIFT SOLENOID "E" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE SR)
	3. Shift solenoid valve SL1 circuit*	DTC P0748 PRESSURE CONTROL SOLENOID "A" ELECTRICAL (SHIFT SOLENOID VALVE SL1)
	4. Shift solenoid valve SL2 circuit*	DTC P0778 PRESSURE CONTROL SOLENOID "B" ELECTRICAL (SHIFT SOLENOID VALVE SL2)
	5. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No down-shift (4th -> 3rd)	1. Shift solenoid valve S3 circuit*	DTC P0979 SHIFT SOLENOID "C" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S3); DTC P0980 SHIFT SOLENOID "C" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S3)
No down-shift (4th -> 3rd)	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No down-shift (3rd -> 2nd)	1. Shift solenoid valve S2 circuit*	DTC P0976 SHIFT SOLENOID "B" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S2); DTC P0977 SHIFT SOLENOID "B" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S2)
No down-shift (3rd -> 2nd)	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No down-shift (2nd -> 1st)	1. Shift solenoid valve S1 circuit*	DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1); DTC P0974 SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S1)
No down-shift (2nd -> 1st)	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No lock up or no lock up off	1. Shift solenoid valve SLU circuit*	DTC P2759 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
	2. Stop light switch circuit*	DTC P0724 BRAKE SWITCH "B" CIRCUIT HIGH
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No lock up	1. Shift solenoid valve SLU circuit*	DTC P2759 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
	2. Engine coolant temperature sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
	3. Stop light switch circuit*	DTC P0724 BRAKE SWITCH "B" CIRCUIT HIGH
	4. Speed sensor NT circuit*	DTC P0717 TURBINE SPEED SENSOR CIRCUIT NO SIGNAL
	5. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No lock up off	1. Shift solenoid valve SLU circuit*	DTC P2759 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
No lock up off	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Shift point too high or too low	1. Shift solenoid valve SLT circuit*	DTC P2716 PRESSURE CONTROL SOLENOID "D" ELECTRICAL (SHIFT SOLENOID VALVE SLT)
	2. Speed sensor NT circuit*	DTC P0717 TURBINE SPEED SENSOR CIRCUIT NO SIGNAL
	3. Speed sensor SP2 circuit*	DTC P0500 VEHICLE SPEED SENSOR "A"; DTC P0503 VEHICLE SPEED SENSOR "A" INTERMITTENT / ERRATIC / HIGH
	4. Throttle position sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
	5. Pattern select (PWR) switch circuit	PATTERN SELECT SWITCH POWER MODE CIRCUIT
	6. ATF temperature sensor circuit*	DTC P0710 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT; DTC P0712 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW INPUT; DTC P0713 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT HIGH INPUT
	7. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Up-shift to 4th from 3rd while engine is cold	1. Engine coolant temperature sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
Up-shift to 4th from 3rd while engine is cold	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Up-shift to 5th from 4th while engine is cold	1. Engine coolant temperature sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
Up-shift to 5th from 4th while engine is cold	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No gear change by shifting into "+" or "-" while shift lever on S	1. Transmission control switch circuit	DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850 PARK / NEUTRAL SWITCH INPUT CIRCUIT
	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Harsh engagement (N -> D)	1. Shift solenoid valve SLT circuit*	DTC P2716 PRESSURE CONTROL SOLENOID "D" ELECTRICAL (SHIFT SOLENOID VALVE SLT)
	2. Speed sensor NT circuit*	DTC P0717 TURBINE SPEED SENSOR CIRCUIT NO SIGNAL
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Harsh engagement (lock up)	1. Speed sensor NT circuit*	DTC P0717 TURBINE SPEED SENSOR CIRCUIT NO SIGNAL
	2. Speed sensor SP2 circuit*	DTC P0500 VEHICLE SPEED SENSOR "A"; DTC P0503 VEHICLE SPEED SENSOR "A" INTERMITTENT / ERRATIC / HIGH
	3. Shift solenoid valve SLU circuit*	DTC P2759 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
	4. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Harsh engagement (any driving position)	1. Throttle position sensor circuit*	DIAGNOSTIC TROUBLE CODE CHART
	2. Shift solenoid valve SL1 circuit*	DTC P0748 PRESSURE CONTROL SOLENOID "A" ELECTRICAL (SHIFT SOLENOID VALVE SL1)
	3. Shift solenoid valve SL2 circuit*	DTC P0778 PRESSURE CONTROL SOLENOID "B" ELECTRICAL (SHIFT SOLENOID VALVE SL2)
	4. Shift solenoid valve SLU circuit*	DTC P2759 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
	5. Shift solenoid valve SLT circuit*	DTC P2716 PRESSURE CONTROL SOLENOID "D" ELECTRICAL (SHIFT SOLENOID VALVE SLT)
	6. Speed sensor NT circuit*	DTC P0717 TURBINE SPEED SENSOR CIRCUIT NO SIGNAL
	7. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Poor acceleration	1. Shift solenoid valve SLT circuit*	DTC P2716 PRESSURE CONTROL SOLENOID "D" ELECTRICAL (SHIFT SOLENOID VALVE SLT)
	2. Pattern select (SNOW) switch circuit	PATTERN SELECT SWITCH SNOW MODE CIRCUIT
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No engine brake	ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
No kick-down	ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Engine stalls when starting off or stopping	1. Shift solenoid valve SLU circuit*	DTC P2759 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
Engine stalls when starting off or stopping	2. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
ECT SNOW does not operate	1. Shift solenoid valve SLT circuit*	DTC P2716 PRESSURE CONTROL SOLENOID "D" ELECTRICAL (SHIFT SOLENOID VALVE SLT)
	2. Pattern select (SNOW) switch circuit	PATTERN SELECT SWITCH SNOW MODE CIRCUIT
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Malfunction in shifting	1. Park/Neutral position switch circuit*	DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850 PARK / NEUTRAL SWITCH INPUT CIRCUIT
	2. Transmission control switch circuit	DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850 PARK / NEUTRAL SWITCH INPUT CIRCUIT
	3. ECM	ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th)	Shift solenoid valve SR circuit*	DTC P0985 SHIFT SOLENOID "E" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE SR); DTC P0986 SHIFT SOLENOID "E" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE SR)
Slip or shudder (5th -> 6th and 6th -> 5th)	Shift solenoid valve SR circuit*	DTC P0985 SHIFT SOLENOID "E" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE SR); DTC P0986 SHIFT SOLENOID "E" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE SR)
HINT: *: When the circuit is defective, a DTC may be output.

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

PROBLEM SYMPTOM CHART

Symptom	Suspected area	See
Vehicle does not move in any forward position and reverse position	1. Transmission control rod	ADJUSTMENT
	2. Manual valve	AUTOMATIC TRANSMISSION UNIT
	3. Parking lock pawl	AUTOMATIC TRANSMISSION UNIT
	4. Rear planetary gear unit	AUTOMATIC TRANSMISSION UNIT
	5. Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE
Vehicle does not move with shift lever on R	1. Valve body assembly	REMOVAL
Vehicle does not move with shift lever on R	2. B4 brake	AUTOMATIC TRANSMISSION UNIT
No up-shift (1st-> 2nd)	1. Valve body assembly	REMOVAL
	2. B3 brake	AUTOMATIC TRANSMISSION UNIT
	3. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	4. F2 one-way clutch	AUTOMATIC TRANSMISSION UNIT
No up-shift (2nd -> 3rd)	1. Valve body assembly	REMOVAL
No up-shift (2nd -> 3rd)	2. C3 clutch	AUTOMATIC TRANSMISSION UNIT
No up-shift (3rd -> 4th)	1. Valve body assembly	REMOVAL
No up-shift (3rd -> 4th)	2. C2 clutch	TORQUE CONVERTER AND DRIVE PLATE
No up-shift (4th -> 5th)	1. Valve body assembly	REMOVAL
No up-shift (4th -> 5th)	2. B1 brake	AUTOMATIC TRANSMISSION UNIT
No up-shift (5th -> 6th)	1. Valve body assembly	REMOVAL
No up-shift (5th -> 6th)	2. B2 brake	AUTOMATIC TRANSMISSION UNIT
No down-shift (6th -> 5th)	Valve body assembly	REMOVAL
No down-shift (5th -> 4th)	Valve body assembly	REMOVAL
No down-shift (4th -> 3rd)	Valve body assembly	REMOVAL
No down-shift (3rd -> 2nd)	Valve body assembly	REMOVAL
No down-shift (2nd -> 1st)	Valve body assembly	REMOVAL
No lock up or no lock up off	1. Valve body assembly	REMOVAL
No lock up or no lock up off	2. Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE
Harsh engagement (N -> D)	1. Valve body assembly	REMOVAL
	2. C1 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. C1 clutch	AUTOMATIC TRANSMISSION UNIT
	4. F3 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	5. F4 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (lock up)	1. Valve body assembly	REMOVAL
Harsh engagement (lock up)	2. Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE
Harsh engagement (N -> R)	1. Valve body assembly	REMOVAL
	2. C3 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. C3 clutch	AUTOMATIC TRANSMISSION UNIT
	4. B4 brake	AUTOMATIC TRANSMISSION UNIT
	5. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th -> 6th)	Valve body assembly	REMOVAL
Harsh engagement (1st -> 2nd)	1. Valve body assembly	REMOVAL
	2. B3 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. B3 brake	AUTOMATIC TRANSMISSION UNIT
	4. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	5. F2 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (2nd -> 3rd)	1. Valve body assembly	REMOVAL
	2. C3 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. C3 clutch	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (3rd -> 4th)	1. Valve body assembly	REMOVAL
	2. C2 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. C2 clutch	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (4th -> 5th)	1. Valve body assembly	REMOVAL
	2. B1 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. B1 brake	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (5th -> 6th)	1. Valve body assembly	REMOVAL
	2. B2 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. B2 brake	AUTOMATIC TRANSMISSION UNIT
Harsh engagement (6th -> 5th)	1. Valve body assembly	REMOVAL
	2. C3 accumulator	AUTOMATIC TRANSMISSION UNIT
	3. C3 clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (forward and reverse, after warm-up)	1. Valve body assembly	REMOVAL
	2. Oil strainer	REMOVAL
	3. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	4. C3 clutch	AUTOMATIC TRANSMISSION UNIT
	5. Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE
Slip or shudder (particular position, just after engine starts)	Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE
Slip or shudder (shift lever on R)	1. B4 brake	AUTOMATIC TRANSMISSION UNIT
	2. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	3. C3 clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (1st)	1. C1 clutch	AUTOMATIC TRANSMISSION UNIT
	2. F3 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	3. F4 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (2nd)	1. C1 clutch	AUTOMATIC TRANSMISSION UNIT
	2. B3 brake	AUTOMATIC TRANSMISSION UNIT
	3. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	4. F2 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	5. F4 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (3rd)	1. C1 clutch	AUTOMATIC TRANSMISSION UNIT
	2. C3 clutch	AUTOMATIC TRANSMISSION UNIT
	3. F1 one-way clutch	AUTOMATIC TRANSMISSION UNIT
	4. F4 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (4th)	1. C1 clutch	AUTOMATIC TRANSMISSION UNIT
	2. C2 clutch	AUTOMATIC TRANSMISSION UNIT
	3. F4 one-way clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (5th)	1. C2 clutch	AUTOMATIC TRANSMISSION UNIT
	2. C3 clutch	AUTOMATIC TRANSMISSION UNIT
	3. B1 brake	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (6th)	1. C2 clutch	AUTOMATIC TRANSMISSION UNIT
Slip or shudder (6th)	2. B2 brake	AUTOMATIC TRANSMISSION UNIT
No engine braking (1st +- 4th: shift lever on S)	C4 clutch	AUTOMATIC TRANSMISSION UNIT
No engine braking (1st: shift lever on 1)	1. Valve body assembly	REMOVAL
No engine braking (1st: shift lever on 1)	2. B4 brake	AUTOMATIC TRANSMISSION UNIT
No engine braking (2nd: shift lever on 2)	1. Valve body assembly	REMOVAL
No engine braking (2nd: shift lever on 2)	2. B2 brake	AUTOMATIC TRANSMISSION UNIT
No engine braking (3rd: shift lever on 3)	1. Valve body assembly	REMOVAL
No engine braking (3rd: shift lever on 3)	2. B1 brake	AUTOMATIC TRANSMISSION UNIT
No engine braking (4th: shift lever on 4)	Valve body assembly	REMOVAL
No kick-down	Valve body assembly	REMOVAL
Shift point too high or too low	Valve body assembly	REMOVAL
Poor acceleration (all positions)	1. Valve body assembly	REMOVAL
Poor acceleration (all positions)	2. Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE
Poor acceleration (6th)	1. B2 brake	AUTOMATIC TRANSMISSION UNIT
	2. C2 clutch	AUTOMATIC TRANSMISSION UNIT
	3. Front planetary gear unit	AUTOMATIC TRANSMISSION UNIT
Engine stalls when starting off or stopping	1. Valve body assembly	REMOVAL
Engine stalls when starting off or stopping	2. Torque converter clutch	TORQUE CONVERTER AND DRIVE PLATE

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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