U340_Automatic_Transaxle.pdf

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

AX–1

AUTOMATIC TRANSAXLE

SYSTEM

PRECAUTION

NOTICE:

• Perform the RESET MEMORY (AT initialization) when

replacing the automatic transaxle assembly, engine

assembly or ECM (See page AX-14 ).

• Perform the REGISTRATION (VIN registration) when

replacing the ECM (See page ES-13 ).

HINT:

The RESET MEMORY cannot be completed by only

disconnecting the battery cable.

CAUTION:

When using compressed air, always aim away from

yourself to prevent Automatic Transmission Fluid (ATF)

or kerosene from spraying on your face.

NOTICE:

• The automatic transaxle is composed of high

precision parts which need careful inspection before

reassembly. Even a small nick could cause fluid

leakage or affect the performance. The instructions

here are organized so that you work on only one

component group at a time. This will help avoid

confusion caused by similar-looking parts of different

sub-assemblies being on your workbench at the same

time. The component groups are inspected and

repaired from the converter housing side. As far as

possible, complete the inspection, repair and

reassembly before proceeding to the next component

group. If a defect is found in a certain component

group during reassembly, inspect and repair that

group immediately. If a component group cannot be

assembled because some parts are on order, be sure

to keep all parts of the group in a separate container

while proceeding with disassembly, inspection, repair

and reassembly of other component groups.

• When changing the automatic transmission fluid, use

only "Toyota Genuine ATF WS" (ATF JWS3324 or

NWS9638).

• All disassembled parts should be washed clean and

any fluid passages and holes should be blown

through with compressed air.

• Dry all parts with compressed air. Never use a shop

rag or a piece of cloth to dry them.

• Only recommended ATF or kerosene should be used

for cleaning.

• After cleaning, the parts should be arranged in the

correct order for efficient inspection, repair, and

reassembly.

• When disassembling a valve body, be sure to match

each valve with the corresponding spring.

AX–2

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

• New brake and clutch discs that are to be used for

replacement must be soaked in ATF for at least 15

minutes before reassembly.

• All oil seal rings, clutch discs, clutch plates, rotating

parts, and sliding surfaces should be coated with ATF

prior to reassembly.

• All gaskets and rubber O-rings should be replaced

with new ones.

• Do not apply adhesive cements to gaskets or similar

parts.

• Make sure that the ends of snap rings are not aligned

with any cutouts and are installed in the grooves

correctly.

• When replacing a worn bushing, the sub-assembly

containing the bushing must also be replaced.

• Check thrust bearings and races for wear and

damage. Replace them as necessary.

• When working with FIPG material, you must observe

the following:

– Using a razor blade and a gasket scraper, remove

all the old packing (FIPG) material from the gasket

surface.

– Clean both sealing surfaces with a non-residue

solvent.

– Parts must be reassembled within 10 minutes of

application. Otherwise, the packing (FIPG) material

must be removed and reapplied.

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

AX–3

DEFINITION OF TERMS

Term

Definition

Monitor description

Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).

Related DTCs

A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection

logic.

Typical enabling conditions

Preconditions that allow the ECM to detect malfunctions.

With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the

malfunction threshold(s).

Sequence of operation

The priority order that is applied to monitoring, if multiple sensors and components are used to detect the

malfunction.

While one sensor is being monitored, the next sensor or component is not monitored until the current

monitoring is concluded.

Required sensor/components

The sensors and components that are used by the ECM to detect malfunctions.

Frequency of operation

The number of times that the ECM checks for malfunctions per driving cycle.

"Once per driving cycle" means that the ECM detects malfunctions only one time during a single driving

cycle.

"Continuous" means that the ECM detects malfunctions every time the enabling conditions are met.

Duration

The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before

setting a DTC. This timing begins when the typical enabling conditions are met.

Malfunction thresholds

Beyond this value, the ECM concludes that there is a malfunction and sets a DTC.

MIL operation

MIL illumination timing after a defect is detected.

"Immediate" means that the ECM illuminates the MIL the instant the ECM determines that there is a

malfunction.

"2 driving cycle" means that the ECM illuminates the MIL if the same malfunction is detected again in the

next driving cycle.

Component operating range

Normal operating ranges of sensors and solenoids under normal driving conditions.

Use these ranges as references.

They cannot be used to judge if a sensor or solenoid is defective or not.

AX–4

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

PARTS LOCATION

COMBINATION METER

- MIL (MALFUNCTION INDICATOR LAMP)

STOP LIGHT SWITCH

SHIFT LOCK CONTROL ECU

DLC3

(DATA LINK CONNECTOR 3)

TRANSMISSION WIRE

(ATF TEMPERATURE SENSOR)

ECM

VEHICLE SPEED SENSOR

TRANSMISSION REVOLUTION

SENSOR (SPEED SENSOR (NT))

PARK / NEUTRAL

POSITION SWITCH

SHIFT SOLENOID VALVE S2

SHIFT SOLENOID VALVE SLU

SHIFT SOLENOID VALVE SLT

SHIFT SOLENOID VALVE S1

SHIFT SOLENOID VALVE ST

C130143E01

U340E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM

AX–5

SYSTEM DIAGRAM

The configuration of the electronic control system in the

U340E automatic transaxle is as shown in the following chart.

ECM

Stop Light Switch

ST1-

STOP

STP

Stop Light

IGN

To IG2 Relay

IGSW

Shift Lock Control ECU

STAR

ODMS

To Ignition Switch

To Gauge Fuse

Park/Neutral Position Switch

Starter

STA

ETCS

+BM

Electronically Controlled Transmission

Solenoid

EFI

Shift Solenoid Valve SLU

To C/OPN Relay

BATT

SLU+

SLU-

Shift Solenoid Valve SLT

+B2

MREL

SLT+

SLT-

Shift Solenoid Valve S1

MAIN

EFI

Shift Solenoid Valve S2

Battery

E01

E02

Shift Solenoid Valve ST

THO1

ETHO

ATF Temperature Sensor

C130145E01

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