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U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX1
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:
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· 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 AX
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.
AX2 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:
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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.
AX
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX3
DEFINITION OF TERMS
Term Definition
Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection
Related DTCs
logic.
Preconditions that allow the ECM to detect malfunctions.
Typical enabling conditions With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the
malfunction threshold(s).
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the
malfunction.
Sequence of operation
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.
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
Frequency of operation
cycle.
"Continuous" means that the ECM detects malfunctions every time the enabling conditions are met.
The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before
Duration
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.
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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
MIL operation malfunction.
"2 driving cycle" means that the ECM illuminates the MIL if the same malfunction is detected again in the
next driving cycle.
Normal operating ranges of sensors and solenoids under normal driving conditions.
Component operating range Use these ranges as references.
They cannot be used to judge if a sensor or solenoid is defective or not.
AX
AX4 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
PARTS LOCATION
COMBINATION METER
- MIL (MALFUNCTION INDICATOR LAMP)
STOP LIGHT SWITCH
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SHIFT LOCK CONTROL ECU
DLC3
(DATA LINK CONNECTOR 3)
TRANSMISSION WIRE VEHICLE SPEED SENSOR
ECM
(ATF TEMPERATURE SENSOR)
AX TRANSMISSION REVOLUTION
SENSOR (SPEED SENSOR (NT))
PARK / NEUTRAL
POSITION SWITCH
SHIFT SOLENOID VALVE SLU
SHIFT SOLENOID VALVE S2
SHIFT SOLENOID VALVE SLT
SHIFT SOLENOID VALVE S1
SHIFT SOLENOID VALVE ST
C130143E01
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX5
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
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To Gauge Fuse
Park/Neutral Position Switch Park/Neutral Position Switch
P
ST R
N
STA
Starter D
2
ST L
ETCS
+BM Electronically Controlled Transmission AX
Solenoid
EFI Shift Solenoid Valve SLU
SLU+
BATT
To C/OPN Relay +B SLU-
Shift Solenoid Valve SLT
SLT+
+B2 SLT-
Shift Solenoid Valve S1
MAIN MREL
EFI S1
Shift Solenoid Valve S2
Battery E1 S2
Shift Solenoid Valve ST
E01
E02 ST
THO1
ETHO
ATF Temperature Sensor
C130145E01
AX6 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
To MET Fuse Transmission Revolution Sensor
(Speed Sensor NT)
Combination Meter NT+
NT-
W
SPD
TACH
DLC3
To ECU-IG TC
Fuse
CANH
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Vehicle Speed Sensor CANL
To CAN BUS
AX C130144E01
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX7
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
(a) The ECT (Electronic Controlled automatic
Transmission/Transaxle) is an automatic
transmission/transaxle that electronically controls
shift timing using the ECM. The ECM detects
electrical signals that indicate engine and driving
conditions, and controls the shift point, based on
driver habits and road conditions. As a result, fuel
efficiency and power transmission/transaxle
performance are improved.
Shift shock has been reduced by controlling the
engine and transmission simultaneously.
In addition, the ECT has features such as the
following:
· Diagnostic function
· Fail-safe function when a malfunction occurs
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AX
AX8 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
HOW TO PROCEED WITH
TROUBLESHOOTING
HINT:
· The ECM of this system is connected to the CAN
communication system. Therefore, before starting
troubleshooting, be sure to check that there is no trouble in
the CAN communication system.
· The intelligent tester can be used in steps 3, 4, 6, and 9.
1 Vehicle Brought to Workshop
NEXT
2 Customer Problem Analysis
NEXT
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3 Connect Intelligent Tester to DLC3
NEXT
4 Check and Clear DTCs and Freeze Frame Data
HINT:
(See page AX-25).
AX
NEXT
5 Visual Inspection
NEXT
6 Setting Check Mode Diagnosis
HINT:
(See page AX-26).
NEXT
7 Problem Symptom Confirmation
HINT:
(See page AX-9).
Symptom does not occur: Go to step 8
Symptom occurs: Go to step 9
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX9
8 Symptom Simulation
HINT:
(See page IN-26).
NEXT
9 DTC Check
HINT:
(See page AX-25).
DTC is not output: Go to step 10
DTC is output: Go to step 17
10 Basic Inspection
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HINT:
(See page AX-93, AX-106 and AX-107).
NG Go to step 19
OK
11 Mechanical System Test
HINT:
(See page AX-11). AX
NG Go to step 16
OK
12 Hydraulic Test
HINT:
(See page AX-13).
NG Go to step 16
OK
13 Manual Shifting Test
HINT:
(See page AX-14).
NG Go to step 15
OK
AX10 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
14 Problem Symptoms Table Chapter 1
HINT:
(See page AX-17).
NG Go to step 18
OK
15 Problem Symptoms Table Chapter 2
HINT:
(See page AX-17).
NEXT
16 Part Inspection
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Go to step 19
17 DTC Chart
HINT:
(See page AX-32).
NEXT
AX 18 Circuit Inspection
NEXT
19 Repair or Replace
NEXT
20 Confirmation Test
NEXT
End
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX11
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
(a) Based on the result of the customer problem
analysis, try to reproduce the symptoms. If the
problem is that the transaxle does not shift up, shift
down, or the shift point is too high or too low,
conduct the following road test referring to the
automatic shift schedule and simulate the problem
symptoms.
2. PERFORM ROAD TEST
NOTICE:
Perform the test at the ATF (Automatic Transmission
Fluid) temperature 50° to 80 °C (122° to 176 °F) in the
normal operation.
(a) D position test
Shift into the D position, fully depress the
accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that 1st to 2nd, 2nd to 3rd and 3rd to 4th
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up-shifts take place, and that the shift points
conform to the automatic shift schedule (See
page SS-19).
HINT:
4th Gear Up-shift Prohibition Control
· Engine coolant temperature is 60 °C (140 °F)
or less.
· ATF temperature is 10 °C (50 °F) or less.
4th Gear Lock-up Prohibition Control
· Brake pedal is depressed.
· Accelerator pedal is released.
· Engine coolant temperature is 60 °C (140 °F) AX
or less.
· ATF temperature is 10 °C (50 °F) or less.
(2) Check for shift shock and slippage.
Check for shock and slippage when up-shifting
from 1st to 2nd, 2nd to 3rd and 3rd to 4th.
(3) Check for abnormal noises and vibration.
Check for abnormal noise and vibration when
up-shifting from 1st to 2nd, 2nd to 3rd and 3rd to
4th while driving with the shift lever in the D
position, and also check while driving in the lock-
up condition.
HINT:
The cause of abnormal noises and vibration
must be checked very thoroughly as it could also
cause loss of balance in parts, such as the
differential and torque converter.
AX12 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
(4) Check kick-down operation.
Check the possible kick-down vehicle speeds
when the 2nd to 1st, 3rd to 2nd and 4th to 3rd
kick-downs take place while driving with the shift
lever in the D position. Confirm that each takes
place within the applicable vehicle speed range
indicated in the automatic shift schedule (See
page SS-19).
(5) Check for abnormal shock and slippage during
kick-down.
(6) Check the lock-up mechanism.
· Drive in the D position (4th gear) at a
constant speed (lock-up ON) of
approximately 37 mph (60 km/h).
· Lightly depress the accelerator pedal and
check that the engine speed does not change
abruptly.
HINT:
· There is no lock-up function in the 1st, 2nd
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and 3rd gears in the D position.
· If there is a sudden increase in engine speed,
lock-up has not occurred.
(b) 3 position test
Shift into the 3 position, fully depress the accelerator
pedal and check the following points:
(1) Check the transmission control switch operation.
While driving in the D position (4th gear), shift
the shift lever into the 3 position, and check that
the 4th to 3rd down-shift takes place.
(2) Check up-shift operation.
Check that the 1st to 2nd and 2nd to 3rd up-
AX shifts take place, and that the shift points
conform to the automatic shift schedule (See
page SS-19).
HINT:
There is no 3rd to 4th up-shift in the 3 position.
(3) Check engine braking.
While driving in the 3 position and 3rd gear,
release the accelerator pedal and check the
engine braking effect.
(c) 2 position test
Shift into the 2 position and fully depress the
accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that the 1st to 2nd up-shift takes place
and that the shift point conforms to the automatic
shift schedule (See page SS-19).
HINT:
There is no lock-up function in the 2 position.
(2) Check engine braking.
While driving in the 2 position and 2nd gear,
release the accelerator pedal and check the
engine braking effect.
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX13
(3) Check for abnormal noises during acceleration
and deceleration, and for shock during up-shift
and down-shift.
(d) L position test
Shift into the L position, fully depress the accelerator
pedal and check the following points.
(1) Check that no up-shift takes place.
While driving in the L position, check that there
is no up-shift to 2nd gear.
(2) Check engine braking.
While driving in the L position, release the
accelerator pedal and check the engine braking
effect.
(3) Check for abnormal noises during acceleration
and deceleration.
(e) R position test
Shift into the R position, fully depress the
accelerator pedal and check for slippage.
CAUTION:
Before conducting this test, ensure that the test
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area is free from people and obstructions.
(f) P position test
Stop the vehicle on a slope (more than 5°), shift into
the P position and release the parking brake. Check
that the vehicle does not move.
AX
AX14 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
MECHANICAL SYSTEM TESTS
1. STALL SPEED TEST
HINT:
This test is to check the overall performance of the
engine and transaxle by measuring the stall speeds in
the D position.
NOTICE:
· Do not perform the stall speed test for longer than
5 seconds.
· To ensure safety, perform this test in a wide, clear
level area which provides good traction.
· The stall speed test must always be carried out by
pairs of technicians. One technician must watch
the wheels and wheel stoppers from outside the
vehicle to make sure they do not slip, while the
other performs the test.
(a) Connect the intelligent tester to the DLC3.
(b) Run the vehicle until the ATF (Automatic
Transmission Fluid) temperature reaches 50° to
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80°C (122° to 176°F).
(c) Allow the engine to idle with the air conditioning
OFF.
(d) Chock all 4 wheels.
(e) Set the parking brake and keep the brake pedal
firmly depressed with your left foot.
(f) Shift the shift lever to the D position.
(g) Depress the accelerator pedal all the way down with
your right foot.
(h) Read the engine rpm (stall speed) and release the
accelerator pedal immediately.
AX Standard value:
1,850 to 2,450 rpm
Evaluation:
Test Result Possible Cause
· Stator one-way clutch is not operating properly
· Torque converter is faulty (Stall speed is less than standard value
Stall speed is lower than standard value
by 600 rpm or more.)
· Engine power is insufficient
· Line pressure is too low
Stall speed is higher than standard value · Forward clutch (C1) is slipping
· No. 2 one-way clutch (F2) is not operating properly
2. SHIFT TIME LAG TEST
HINT:
This test is to check the conditions of the direct clutch,
forward clutch, 1st brake and reverse brake.
(a) Connect the intelligent tester to the DLC3.
(b) Run the vehicle until the ATF (Automatic
Transmission Fluid) temperature reaches 50° to
80°C (122° to 176°F).
(c) Allow the engine to idle with the air conditioning
OFF.
(d) Set the parking brake and keep the brake pedal
firmly depressed with your left foot.
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX15
(e) Check the D range time lag.
(1) Shift the shift lever into the N position and wait
for 1 minute. (*1)
(2) Shift the shift lever into the D position and
measure the time until the shock is felt. (*2)
(3) Repeat procedures (*1) and (*2) three times, and
calculate the average time of the three tests.
(f) Check the R range time lag.
(1) Shift the shift lever into the N position and wait
for 1 minute. (*3)
(2) Shift the shift lever into the R position and
measure the time until the shock is felt. (*4)
(3) Repeat procedures (*3) and (*4) three times, and
calculate the average time of the three tests.
Standard value:
D range time lag is less than 1.2 seconds
R range time lag is less than 1.5 seconds
Evaluation :
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Test Result Possible Cause
· Line pressure is too low
D range time lag exceeds standard value · Forward clutch (C1) is worn
· No. 2 one-way clutch (F2) is not operating properly
· Line pressure is too low
R range time lag exceeds standard value · Reverse clutch (C3) is worn
· 1st and reverse brake (B3) is worn
HYDRAULIC TEST
1. PERFORM HYDRAULIC TEST
(a) Measure the line pressure.
NOTICE:
· Perform the test at the normal operating ATF AX
(Automatic Transmission Fluid) temperature
50° to 80°C (122° to 176°F).
· The line pressure test must always be carried
G024063E02
out by pairs of technicians. One technician
must observe the condition of the wheels and
wheel stoppers outside the vehicle, while the
other is performing the test.
· Prevent the SST hose from interfering with
the exhaust pipe.
· This test must be conducted after checking
and adjusting the engine.
· Perform this test with the air conditioning
OFF.
· Do not continue the stall test for more than 5
seconds.
(1) Warm up the ATF.
(2) Lift the vehicle up.
(3) Remove the engine under cover.
(4) Remove the test plug on the transmission case
center right side and connect SST.
SST 09992-00095 (09992-00231, 09992-
00271)
(5) Connect the intelligent tester to the DLC3.
AX16 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
(6) Fully apply the parking brake and chock all 4
wheels.
(7) Start the engine and check the idling speed.
(8) Keep your left foot pressing firmly on the brake
pedal and shift into the D position.
(9) Measure the line pressure when the engine is
idling.
(10)Depress the accelerator pedal all the way down.
Quickly read the highest line pressure when
engine speed reaches stall speed.
(11)Perform the test in the R position in the same
manner.
Standard line pressure
Condition D position kPa (kgf / cm2, psi) R position kPa (kgf / cm2, psi)
372 to 412 kPa 553 to 623 kPa
Idling
(3.8 to 4.2 kgf/cm2, 54 to 60 psi) (5.6 to 6.4 kgf/cm2, 80 to 90 psi)
1,126 to 1,226 kPa 1,664 to 1,864 kPa
Stall
(11.5 to 12.5 kgf/cm2, 163 to 178 psi) (17.0 to 19.0 kgf/cm2, 241 to 270 psi)
Evaluation:
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Problem Possible Cause
· Shift solenoid valve SLT defective
Measured values are higher than specified values in all positions
· Regulator valve defective
· Shift solenoid valve SLT defective
Measured values are lower than specified values in all positions · Regulator valve defective
· Oil pump defective
· D position circuit fluid leak
Pressure is low in D position only
· Forward clutch defective
· R position circuit fluid leak
Pressure is low in R position only · Reverse clutch defective
· 1st and reverse brake defective
AX
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX17
MANUAL SHIFTING TEST
1. PERFORM MANUAL SHIFTING TEST
HINT:
· This test can be used to determine whether the
trouble is occurring in the electrical circuit or is a
mechanical problem in the transaxle.
· If any abnormalities are found in the following test, the
problem is in the transaxle itself.
(a) Disconnect the transmission wire connector.
HINT:
It is possible to deactivate the electrical shift control
by disconnecting the transmission wire. In this way,
it is possible to change gear positions by
mechanical shift change using the shift lever.
(b) Drive with the transmission wire disconnected. Shift
the shift lever into each position to check whether
the gear position changes as shown in the table
below.
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Shift Position Shifting Condition
D 3rd
3 3rd
2 3rd
L 3rd
R Reverse
P Pawl Lock
(c) Connect the transmission wire connector.
(d) Clear the DTC (See page AX-25).
C117640E01
AX
AX18 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
INITIALIZATION
1. RESET MEMORY
NOTICE:
· Perform the RESET MEMORY (AT initialization)
when replacing the automatic transaxle assembly,
engine assembly or ECM.
· The RESET MEMORY can only be performed
using an intelligent tester.
HINT:
The ECM stores the conditions that the ECT controls the
automatic transaxle assembly and engine assembly in
accordance with those characteristics. Therefore, when
the automatic transaxle assembly, engine assembly, or
ECM is replaced, it is necessary to reset the memory so
that the ECM can store the new information.
The reset procedure is as follows.
(a) Turn the ignition switch off.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position and push
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the intelligent tester main switch on.
(d) Select the following items: DIAGNOSIS /
ENHANCED OBD II.
(e) Perform the reset memory procedure from the
ENGINE menu.
CAUTION:
After performing the RESET MEMORY, be sure
to perform the ROAD TEST (See page AX-9) as
described earlier.
HINT:
The ECM stores learned values by performing the
AX ROAD TEST.
(1) Tester menu flow:
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX19
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C130151
AX
AX20 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
MONITOR DRIVE PATTERN
1. MONITOR DRIVE PATTERN FOR ECT TEST
(a) Perform this drive pattern as one method to
simulate the detection conditions of ECT
malfunctions. (The DTCs may not be detected due
to the actual driving conditions. And some DTCs
may not be detected through this drive pattern.)
HINT:
Preparation for driving
· Warm up the engine. (Engine coolant
temperature is 60°C (140°F) or higher.)
· Drive the vehicle when the atmospheric
temperature is -10°C (14°F) or higher.
(Malfunction is not detected when the
atmospheric temperature is less than -10°C
(14°F).)
Driving note
· Drive the vehicle through all gears.
Stop 1st 2nd 3rd 4th (lock-up ON).
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· Repeat the above driving pattern three times or
more.
NOTICE:
· The monitor status can be checked using the
intelligent tester. When using an intelligent
tester, monitor status can be found in the
ENHANCED OBD II / DATA LIST or under
CARB OBD II.
· In the event that the drive pattern must be
interrupted (possibly due to traffic conditions
or other factors), the drive pattern can be
AX resumed and, in most cases, the monitor can
be completed.
CAUTION:
Perform this drive pattern on as level a road as
possible and strictly observe the posted speed
limits and traffic laws while driving.
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX21
Vehicle Speed
Maintain constant speed or gradual acceleration (with throttle open) for 3 minutes or more.*1
Lock-up ON
Approximately Vehicle Speed
62 mph (100 km/h)
Approximately
50 mph (80 km/h)
0
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Warmed up
Stop (Idling)
sufficiently
Normal acceleration through all
gears from 1st to 4th
G031593E14
HINT:
*1: Drive at such a speed in the uppermost gear, to
engage lock-up. The vehicle can be driven at a
speed lower than that in the above diagram under AX
the lock-up condition.
NOTICE:
To detect DTC P0711 (ATF temperature sensor
malfunction), drive the vehicle for approximately
30 minutes.
AX22 U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM
PROBLEM SYMPTOMS TABLE
HINT:
· If a normal code is displayed during the DTC check
although the trouble still occurs, check the electrical
circuits for each symptom in the order given in the
following charts and proceed to the page given for
troubleshooting.
· The Matrix Chart is divided into 2 chapters.
· When the circuit on which *1 is attached malfunctions, a
DTC could be output.
Chapter 1: Electronic Circuit Matrix Chart
Refer to the table below when the trouble cause is considered to be electrical. If the trouble still occurs
even though there are no abnormalities in any of the other circuits, then check and replace the ECM.
Symptom Suspected area See page
No up-shift (Particular gear, from 1st to 3rd gear, is not
ECM IN-34
up-shifted)
1. Shift lock control unit circuit AX-47
No up-shift (From 3rd to 4th)
2. ECM IN-34
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1. Shift lock control unit circuit AX-47
No down-shift (From 4th to 3rd)
2. ECM IN-34
No down-shift (Particular gear, from 1st to 3rd gear, is
ECM IN-34
not down-shifted)
1. Stop light switch circuit *1 ES-48
2. Engine coolant temperature sensor circuit *1 ES-48
3. Vehicle speed sensor circuit *1 ES-48
4. Speed sensor (NT) circuit *1 AX-50
5. ATF temperature sensor circuit *1 AX-42
No lock-up or No lock-up off
6. Shift solenoid valve S1 *1 AX-67
7. Shift solenoid valve S2 *1 AX-71
AX 8. Shift solenoid valve SLU *1 AX-89
9. Throttle position sensor circuit *1 ES-48
10. ECM IN-34
1. Throttle position sensor circuit *1 ES-48
Shift point too high or too low
2. ECM IN-34
Up-shift to 2nd while in L position ECM IN-34
Up-shift to 3nd while in 2 position ECM IN-34
1. Shift lock control unit circuit AX-47
Up-shift from 3rd to 4th in 3 position 2. Park/neutral position switch *1 AX-35
3. ECM IN-34
1. Engine coolant temperature sensor circuit *1 ES-48
Up-shift from 3rd to 4th while engine is cold
2. ECM IN-34
1. Park/neutral position switch *1 AX-35
Harsh engagement (From N to D)
2. ECM IN-34
1. Shift solenoid valve ST *1 AX-63
Harsh engagement (From 3rd to 4th)
2. ECM IN-34
1. Shift solenoid valve SLU *1 AX-89
Harsh engagement (Lock-up)
2. ECM IN-34
1. Throttle position sensor circuit *1 ES-48
Harsh engagement (Any driving position)
2. ECM IN-34
Poor acceleration ECM IN-34
No kick-down ECM IN-34
U340E AUTOMATIC TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM AX23
Symptom Suspected area See page
Engine stalls when starting off or stopping ECM IN-34
1. Park/neutral position switch *1 AX-35
Malfunction in shifting 2. Shift lock control unit circuit AX-47
3. ECM IN-34
Chapter 2: On-Vehicle Repair and Off-Vehicle Repair
Symptom Suspected area See page
1. Manual valve AX-253
2. Valve body assembly AX-113
3. Planetary gear unit AX-173
Vehicle does not move in any forward positions or in R
4. Forward clutch (C1) AX-173
position
5. No. 2 one-way clutch (F2) AX-173
6. Reverse clutch (C3) AX-173
7. 1st and reverse brake (B3) AX-173
1. Manual valve AX-253
2. Valve body assembly AX-113
Vehicle does not move in R position 3. Planetary gear unit AX-173
cardiagn.com
4. Reverse clutch (C3) AX-173
5. 1st and reverse brake (B3) AX-173
1. Valve body assembly AX-113
No up-shift (From 1st to 2nd) 2. 2nd brake (B2) AX-173
3. No. 1 one-way clutch (F1) AX-173
1. Valve body assembly AX-113
No up-shift (From 2nd to 3rd)
2. Direct clutch (C2) AX-173
1. Valve body assembly AX-113
No up-shift (From 3rd to 4th)
2. O/D and 2nd brake (B1) AX-173
No down-shift (From 4th to 3rd) Valve body assembly AX-113
No down-shift (From 3rd to 2nd) Valve body assembly AX-113
No down-shift (From 2nd to 1st) Valve body assembly AX-113 AX
1. Valve body assembly AX-113
No lock-up or No lock-up off
2. Torque converter clutch AX-171
1. Valve body assembly AX-113
Harsh engagement (From N to D) 2. Forward clutc