Automatic Transmission - Diagnostics - U140F: Pre-Check

DIAGNOSIS SYSTEM
1. Description
  - When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1987) or the hand-held tester. Various data output from the vehicle's ECM can then be read.
  - OBD II regulations require that the vehicle's onboard computer illuminates the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in: 1) the computer, or 2) drive system components (which affect the vehicle emissions). In addition, the applicable DTCs prescribed by SAE J2012 are recorded in the ECM memory (see DIAGNOSTIC TROUBLE CODE CHART ).
    If a malfunction only occurs in 3 consecutive trips, the MIL turns off but the DTCs remain in the ECM memory.
    
    Fig 1: Identifying Malfunction Indicator Lamp
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - To check the DTCs, connect the OBD II scan tool or hand-held tester to the Data Link Connector 3 (DLC3) of the vehicle. The OBD II scan tool or hand-held tester also enables you to erase the DTCs and check freeze frame data and various forms of engine data (see the tester's instruction book for further details).
  - The DTCs include SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set according to the SAE, while manufacturer controlled codes can be set freely by a manufacturer with certain restrictions (see the DIAGNOSTIC TROUBLE CODE CHART ).
    
    Fig 2: Locating DLC3 Connector And Hand-held Tester
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - The diagnosis system operates in "normal mode" during normal vehicle use. In "normal mode", 2 trip detection logic* is used to ensure accurate detection of malfunctions. "Check mode" is also available to technicians as an option. In "check mode", 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (hand-held tester only) (see PRE-CHECK ).
  - When a malfunctions is first detected, the malfunctions is temporarily stored in the ECM memory (1st trip). If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate (2nd trip).
2. Inspect the DLC3
  The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
  
  Fig 3: Identifying DLC3 Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Tester Connection Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

If your display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the OBD II scan tool or hand-held tester to the DLC3, turned the ignition switch ON and operated the scan tool or tester, there is a problem on the vehicle side or tool side.
- If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. So consult the Service Department listed in the tool's instruction manual.
INSPECT DIAGNOSIS
Normal mode:
1. Check the MIL
  1. The MIL turns on when the ignition switch is turned ON and the engine is not running.
    HINT:
    
    If the MIL does not turn on, troubleshoot the combination meter (see PROBLEM SYMPTOMS TABLE ).
  2. When the engine is started, the MIL should turn off. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.
    
    Fig 5: Identifying Malfunction Indicator Lamp
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check for DTCs
  NOTE: Hand-held tester only:
  When the diagnosis system is changed from normal mode to check mode, all DTCs and freeze frame data recorded in normal mode will be erased. Before changing modes, always check DTCs and freeze frame data and make a note of them.
  
  Fig 6: Locating DLC3 Connector And Hand-held Tester
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Prepare an OBD II scan tool (complying with SAE J1978) or hand-held tester.
  2. Connect the OBD II scan tool or hand-held tester to the DLC3 in the lower part of the instrument panel.
  3. Turn the ignition switch ON and press the OBD II scan tool or hand-held tester switch ON.
  4. Select the item "DIAGNOSIS/ENHANCED OBD II/ DTC INFO/CURRENT CODES".
  5. Use the OBD II scan tool or hand-held tester to check for DTCs and freeze frame data and write them down (see the instruction manual for the OBD II scan tool or the hand-held tester).
  6. See DIAGNOSTIC TROUBLE CODE CHART to confirm the details of the DTCs.
NOTE: When simulating symptoms with OBD II scan tool (excluding hand-held tester) to check the DTCs, use normal mode. For DTCs subject to "2 trip detection logic", turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL illuminates on the instrument panel and DTCs are recorded in the ECM.
INSPECT DIAGNOSIS
Check Mode:

HINT:

Hand-held tester only:

Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect.
1. Check the DTC
  1. Check the initial conditions.
    - Battery positive voltage 11 V or more
    - Throttle valve fully closed
    - Transaxle in P position A/C switched OFF
  2. Turn the ignition switch OFF.
  3. Prepare the hand-held tester.
  4. Connect the hand-held tester to the DLC3 at the lower of the instrument panel.
  5. Turn the ignition switch ON and push the hand-held tester main switch ON.
    
    Fig 7: Locating DLC3 Connector And Hand-held Tester
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Change the ECM to check mode with the hand-held tester. Make sure the MIL flashes as shown in the illustration.
    NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vise-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF.
    
    Fig 8: ECM Check Mode Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Start the engine. The MIL should turn off after the engine starts.
  8. Simulate the conditions of the malfunction described by the customer.
    NOTE: Leave the ignition switch ON until you have checked the DTCs, etc.
  9. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTCs, freeze frame data and other data.
    HINT:
    
    Take care not to turn the ignition switch OFF, as turning it OFF change the diagnosis system from check mode to normal mode, which erases all the DTCs, etc.
  10. After checking the DTC, inspect the applicable circuit.
2. Clear the DTC
  The following actions will erase the DTCs and freeze frame data.
  - Operating the OBD II scan tool or hand-held tester to erase the codes (see the instruction manual for the OBD II scan tool or the handheld tester).
  - Disconnecting the battery terminals or EFI1 fuse from the engine room R/B No.1 for more than 60 seconds. After clearing DTC, perform the "INITIALIZE" procedure (see PRE-CHECK ).
  HINT:
  
  When operating an OBD II scan tool (complying with SAE J1978) or hand-held tester to erase the codes, the DTCs and freeze frame data will be erased (see the OBD II scan tool's instruction manual for further details).
DATA LIST
HINT:

Using the hand-held tester's or OBD II scan tool's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to shorten labor time.
1. Warm up the engine.
2. Turn the ignition switch OFF.
3. Connect the OBD II scan tool or hand-held tester to the DLC3.
4. Turn the ignition switch ON.
5. Turn ON the OBD II scan tool or the hand-held tester.
6. When using the hand-held tester:
  Enter the following menus: "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
7. Read the "DATA LIST" on the tester.
  
  Fig 9: Enhanced OBD II Diagnosis Data Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
ACTIVE TEST
HINT:

Performing the hand-held tester's or OBD II scan tool's ACTIVE TEST allows relay, VSV, actuator and other item to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to shorten labor time. The DATA LIST can be displayed during the ACTIVE TEST.
1. Warm up the engine.
2. Turn the ignition switch OFF.
3. Connect the hand-held tester to the DLC3.
4. Turn the ignition switch ON.
5. Turn ON the hand-held tester.
6. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST.
7. Perform the "ACTIVE TEST" according to the display on the tester.
  
  Fig 10: Enhanced OBD II Active Test Diagnosis Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Then, perform ACTIVE TEST "LINE PRESS UP" to check the change in line pressure.

HINT:

The pressure values in ACTIVE TEST and HYDRAULIC TEST are different from each other.

DEFINITION OF TERMS

TERMS DEFINITION

Term	Definition
Monitor description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCs	Diagnostic code
Typical enabling condition	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. When a sensor is being monitored, the next sensor or component will not be monitored until the current sensor monitoring is finished.
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 the malfunction only one time during a single driving cycle. "Continuous" means that the ECM detects the malfunction every time when an enabling condition is met during a single driving cycle.
Duration	The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a DTC. This timing begins after the "typical enabling conditions" are met.
Malfunction thresholds	Beyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation	MIL illumination timing after a malfunction is detected. "Immediately" 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 MIL if the same malfunction is detected again in the 2nd driving cycle.

TOYOTA/LEXUS PART AND SYSTEM NAME LIST

This reference list indicates the part name used in this manual along with their definitions.

TOYOTA/LEXUS PART MANUAL DEFINITION

TOYOTA/LEXUS name	Definition
TOYOTA HCAC system, Hydro carbon absorptive catalyst (HCAC) system, HC absorptive three-way catalyst	HC absorptive three-way catalytic converter
Variable valve timing sensor, VVT sensor	Camshaft position sensor
Variable valve timing system, VVT system	Camshaft timing control system
Camshaft timing oil control valve, Oil control valve OCV, VVT, VSV	Camshaft timing oil control valve
Variable timing and lift, VVTL	Camshaft timing and lift control
Crankshaft position sensor "A"	Crankshaft position sensor
Engine speed sensor	Crankshaft position sensor
THA	Intake air temperature
Knock control module	Engine knock control module
Knock sensor	Engine knock sensor
Mass or volume air flow circuit	Mass air flow sensor circuit
Vacuum sensor	Manifold air pressure sensor
Internal control module, Control module, Engine control ECU, PCM	Power train control module
FC idle	Deceleration fuel cut
Idle air control valve	Idle speed control
VSV for CCV, Canister close valve VSV for canister control	Evaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1, EVAP VAV, Purge VSV	Evaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSV	Evaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative emission control system pressure sensor	Fuel tank pressure sensor
Charcoal canister	Evaporative emissions canister
ORVR system	On-board refueling vapor recovery system
Intake manifold runner control	Intake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)	Intake manifold tuning valve
Intake control VSV	Intake manifold tuning solenoid valve
AFS	Air fuel ratio sensor
O2 sensor	Heater oxygen sensor
Oxygen sensor pumping current circuit	Oxygen sensor output signal
Oxygen sensor reference ground circuit	Oxygen sensor signal ground
Accel position sensor	Accelerator pedal position sensor
Throttle actuator control motor, Actuator control motor, Electronic throttle motor, Throttle control motor	Electronic throttle actuator
Electronic throttle control system, Throttle actuator control system	Electronic throttle control system
Throttle/pedal position sensor, Throttle/pedal position switch, Throttle position sensor/switch	Throttle position sensor
Turbo press sensor	Turbocharger pressure sensor
Turbo VSV	Turbocharger pressure control solenoid valve
P/S pressure switch	Power-steering pressure switch
VSV for ACM	Active control engine mount
Speed sensor, Vehicle speed sensor "A", Speed sensor for skid control ECU	Vehicle speed sensor
ATF temperature sensor, Trans, fluid temp, sensor, ATF temperature sensor "A"	Transmission fluid temperature sensor
Electronic controlled automatic transmission, ECT	Electronically controlled automatic
Intermediate shaft speed sensor "A"	Counter gear speed sensor
Output speed sensor	Output shaft speed sensor
Input speed sensor, Input turbine speed sensor "A", Speed sensor (NT), Turbine speed sensor	Input turbine speed sensor
PNP switch, NSW	Park/neutral position switch
Pressure control solenoid	Transmission pressure control solenoid
Shift solenoid	Transmission shift solenoid valve
Transmission control switch, Shift lock control unit	Shift lock control module
Engine immobilizer system, Immobilizer system	Vehicle anti-theft system

The monitor will run whenever the following DTCs are not present (Monitor disablement List)
HINT:

This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on the left are being set.

As for the "X" mark, when the DTC on the left is stored, detection of the DTC in the upper column is not performed.

Fig 11: ECM Monitoring Status (1 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 12: ECM Monitoring Status (2 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 13: ECM Monitoring Status (3 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 14: ECM Monitoring Status (4 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 15: ECM Monitoring Status (5 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 16: ECM Monitoring Status (6 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
PROBLEM SYMPTOM CONFIRMATION
Try to reproduce the symptoms according to customer problem analysis.

If the problem is that the transaxle does not up-shift, down-shift, 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.
ROAD TEST
NOTE: Perform the test with the Automatic Transmission Fluid (ATF) temperature at 50 to 80°C (122 to 176°F) in the normal operation.
1. D position test
  Move the shift lever into the D position, depress the accelerator pedal fully and then check the following points:
  1. Check the up-shift operation.
    The up-shift operation, such as 1 --> 2, 2 --> 3 and 3 --> O/D, takes place at the shift point shown in the automatic shift schedule (see AUTOMATIC TRANSAXLE (U140F) - SERVICE SPECIFICATIONS ).
    
    HINT:
    - O/D Gear Up-shift Prohibition Control
      1. Engine coolant temperature, is 60°C (140°F) or less.
      2. If there is a difference of 10 km/h (6 mph) between the set cruise control speed and actual vehicle speed.
    - O/D Gear Lock-up Prohibition Control
      1. Brake pedal is depressed.
      2. Coolant temperature, is 60°C (140°F) or less.
  2. Check for shift shock and slip.
    Check for shock and slip at the up-shift operation of 1 --> 2, 2 --> 3 and 3 --> O/D.
  3. Check for abnormal noise and vibration.
    Run the vehicle in the D position lock-up or O/D gear and check for abnormal noise and vibration.
    
    HINT:
    
    Check the cause of abnormal noise and vibration very thoroughly, as it could be due to the loss of balance in the differential torque converter clutch, etc.
  4. Check the kick-down operation.
    While running the vehicle in the D position, 2nd, 3rd or O/D gears, check that the possible kick-down vehicle speed limits of 2 --> 1, 3 --> 2 and O/D --> 3 kick-downs conform to those indicated on the automatic shift schedule (see AUTOMATIC TRANSAXLE (U140F) - SERVICE SPECIFICATIONS ).
  5. Check abnormal shock and slip at kick-down.
  6. Check the lock-up mechanism.
    - Drive the vehicle in the D position or O/D gear at steady speed (lock-up ON) of about 60 km/h (37 mph).
    - Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
  If there is a big jump in the engine speed, there is no lock-up.
2. 2 position test
  Move the shift lever into the 2 position, depress the accelerator pedal fully and check the following points:
  1. Check up-shift operation.
    Check that the up-shift operation of 1 --> 2 up-shift takes place and that the shift point conforms to the automatic shift schedule (see AUTOMATIC TRANSAXLE (U140F) - SERVICE SPECIFICATIONS ).
    
    HINT:
    
    There is no O/D up-shift and lock-up in the 2 position.
  2. Check the engine braking.
    While running the vehicle in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.
  3. Check for abnormal noise during acceleration and deceleration, and for shock at up-shift and down-shift.
3. L position test
  Move the shift lever into the 2 position, depress the accelerator pedal fully and check the following points:
  1. Check no up-shift.
    While running the vehicle in the L position, check that there is no up-shift to the 2nd gear.
  2. Check the engine braking.
    While running the vehicle in the L position, release the accelerator pedal and check the engine braking effect.
  3. Check for abnormal noise during acceleration and deceleration.
4. R position test
  Shift into the R position, lightly depress the accelerator pedal, and check that the vehicle moves backward without any abnormal noise or vibration.
  
  CAUTION: Before conducting this test, ensure that the test area is kept away from people and obstructions.
5. P position test
  Stop the vehicle on a grade (more than 5°). After shifting into the P position, release the parking brake. Then, check that the parking lock pawl holds the vehicle in place.
BASIC INSPECTION
1. Check the fluid level.
  HINT:
  - Drive the vehicle so that the engine and transaxle are at normal operating temperature.
    Normal operating temperature (Fluid temperature): 70 to 80°C (158 to 176°F)
  - Use the COOL range on the dipstick as a rough reference when the fluid is replaced or the engine does not run.
    1. Park the vehicle on a level surface and apply the parking brake.
    2. With the engine idling and the brake pedal depressed, shift the shift lever into all positions from P to L and return it to the P position.
    3. Pull out the dipstick and wipe it out.
    4. Push the oil level gauge back fully into the pipe.
    5. Pull out the oil level gauge and check that the fluid level is within the HOT range.
      
      Fig 17: Checking Fluid Level
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  If the level is at the lower side, add new fluid.
  
  Fluid type: ATF type T-IV or equivalent
  
  Capacity: 3.9 liters (4.1 US qts, 3.4 Imp. qts)
  
  NOTE: Do not overfill.
2. Check the fluid condition.
  If the fluid smells burnt or the color is black, replace it.
3. Replace the ATF.
  1. Remove the drain plug and drain the fluid.
  2. Reinstall the drain plug securely.
    
    Fig 18: Locating Drain Plug
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. With the engine stopped, add new fluid through the oil filler pipe.
    Fluid type: ATF type T-IV or equivalent
    
    Capacity: 3.9 liters (4.1 US qts, 3.4 Imp. qts)
  4. Start the engine and move the shift lever into all positions from P to L and then move it into the P position.
    
    Fig 19: Adding New Fluid Through Oil Filter Pipe
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. With the engine idling, check the fluid level. If necessary add fluid to the COOL level on the dipstick.
  6. Check the fluid level at the normal operating temperature of 70 to 80°C (158 to 176°F), and add if necessary.
  NOTE: Do not overfill.
4. Check the fluid leak.
  Check for leak in the transaxle.
  
  If there is leak, it is necessary to repair or replace O-rings, gaskets, oil seals, plugs or other parts.
  
  Fig 20: Checking Fluid Level
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Inspect and adjust the shift lever position.
  When moving the shift lever from the N position to the other positions, check that the lever can be shifted smoothly and accurately into each position and that the position indicator is aligned with the correct position.
  
  If the indicator is not aligned with the correct position, carry out the following adjustment procedures.
  1. Loosen the nut on the shift lever.
  2. Push the control shaft fully rearward.
    
    Fig 21: Locating Nut On Shift Lever
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Return the control shaft lever by 2 notches to the N position.
  4. Set the shift lever in the N position.
  5. While holding the shift lever lightly toward the R position, tighten the shift lever nut.
    Torque: 13 N.m (130 kgf.cm, 9 ft.lbf)
  6. Start the engine and make sure that the vehicle moves forward when moving the lever from N to D and moves backward when moving it to the R position.
    
    Fig 22: Repositioning Shift Lever Position
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Inspect and adjust the park/neutral position switch. Check that the engine can be started with the shift lever only in the N or P position, but never in the other positions.
  If it is not as stated above, carry out the following adjustment procedures.
  1. Loosen the park/neutral position switch bolt and set the shift lever in the N position.
  2. Align the groove with the neutral basic line.
  3. Hold it in the position and tighten the bolt.
    Torque: 5.4 N.m (55 kgf.cm, 48 in.lbf)
    
    For further inspection of the park/neutral position switch, see DTC P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input) .
    
    Fig 23: Aligning Groove With Neutral Basic Line
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Check the idle speed.
  Idle speed: 700 +/- 50 rpm
  
  (In N position and A/C OFF)

MECHANICAL SYSTEM TESTS

Measure the stall speed.

This test checks the overall performance of the transaxle and engine by measuring the stall speeds in the D and R positions.

NOTE:

Perform the test at the normal operating automatic transmission fluid temperature of 50 to 80°C (122 to 176°F).
Do not continuously run this test longer than 5 seconds.
To ensure safety, conduct this test in a wide, clear and level area which provides good traction.
The stall test should always be carried out in pairs. One technician should observe the conditions of wheels or chocks outside the vehicle while the other is doing the test.

Chock the 4 wheels.
Connect the OBD II scan tool or hand-held tester to the DLC3.
Fully apply the parking brake.
Firmly depress the brake pedal with your left foot.
Start the engine.
Move the shift lever into the D position. Fully depress the accelerator pedal with your right foot.
Quickly read the stall speed at this time.

Stall speed: 2,200 to 2,500 rpm

Evaluation:

PROBLEM SYMPTOMS TABLE - STALL SPEED

Problem	Possible Cause
(a) Stall speed low in D and R positions	Engine output may be insufficient Stator one-way clutch is not operating properly HINT: If more than 600 rpm or below the specified value, the torque converter could be faulty.
(b) Stall speed high in D position	Line pressure too low Forward clutch slipping No.2 one-way clutch not operating properly O/D clutch slipping
(c) Stall speed high in R position	Line pressure too low Direct clutch slipping 1st and reverse brake slipping O/D clutch slipping
(d) Stall speed high in D and R positions	Line pressure too low Improper fluid level O/D one-way clutch not operating properly

Measure the time lag.

When the shift lever is moved while the engine is idling, there will be a certain time lapse or lag before the shock can be felt. This is used for checking the conditions of the O/D direct clutch, forward clutch, and 1st and reverse brake.

NOTE:

Perform the test at the normal operating automatic transmission fluid temperature of 50 to 80°C (122 to 176°F).
Be sure to allow 1 minute interval between the tests.
Take 3 measurements and take the average value.

Connect the OBD II scan tool or hand-held tester to the DLC3.
Fully apply the parking brake.
Start the engine and check idle speed.
Idle speed: 700 +/- 50 rpm (In N position and A/C OFF)
Move the shift lever from the N to D position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt.
Measure the time lag of N to R in the same way.

Time lag:

N --> D: Less than 1.2 seconds N --> R: Less than 1.5 seconds

Evaluation (If N --> D time or N --> R time lag is longer than specified):

PROBLEM SYMPTOMS TABLE - TIME LAG

Problem	Possible Cause
N → D time lag is longer	Line pressure too low Forward clutch worn O/D one-way clutch not operating
N → R time lag is longer	Line pressure too low Direct clutch worn 1st and reverse brake worn O/D one-way clutch not operating properly

HYDRAULIC TEST

Measure the line pressure.

NOTE:

Perform the test at the normal operation automatic transmission fluid temperature of 50 to 80°C (122 to 176°F).
The line pressure test should always be carried out in pairs. One technician should observe the conditions of wheels or chocks outside the vehicle while the other is doing the test.
Be careful to prevent SST's hose from interfering with the exhaust pipe.

Warm up the ATF.
Remove the test plug on the transaxle case front left side and connect SST (see COMPONENTS for the location to connect SST).
SST 09992-00095 (09992-00231, 09992-00271)
Fully apply the parking brake and chock the 4 wheels.
Connect the OBD II scan tool or hand-held tester to the DLC3.
Start the engine and check the idling speed.
Firmly depress the brake pedal with your left foot and move the shift lever into the D position.
Measure the line pressure when the engine is idling.
Depress the accelerator pedal all the way down. Quickly read the highest line pressure when the engine speed reaches the stall speed.
Perform the test in the R position in the same way.

Specified line pressure:

LINE PRESSURE SPECIFIED CONDITION

Condition	D Position	R Position
Idling	372 to 450 kPa (3.8 to 4.6 kgf/cm² , 54 to 65 psi)	640 to 800 kPa (6.5 to 8.2 kgf/cm² , 93 to 116 psi)
Stall	931 to 1,100 kPa (9.5 to 1 1.2 kgf/cm² , 1 34 to 1 60 psi)	1,730 to 2,030 kPa (17.6 to 20.7 kgf/cm² , 251 to 294 psi)

If the measured pressure does not reach the specified value, recheck the throttle cable adjustment and then retest.

Evaluation:

PROBLEM SYMPTOMS TABLE - HYDRAULIC TEST

Problem	Possible Cause
If the measured values at all positions are higher	Throttle cable out of adjustment Throttle valve defective Regulator valve defective
If the measured values at all positions are lower	Throttle cable out of adjustment Throttle valve defective Regulator valve defective Oil pump defective O/D direct clutch defective
If pressure is low in the D position only	D position circuit fluid leak Forward clutch defective
If pressure is low in the R position only	R position circuit fluid leak Direct clutch defective 1st and reverse brake defective

MANUAL SHIFTING TEST

HINT:

With this test, whether the trouble occurs in the electrical circuit or is a mechanical problem in the transaxle can be determined.

Disconnect the solenoid wire.

Check the manual driving operation.

Check that the shift and gear positions correspond with the table below.

While driving the vehicle, move the shift lever through the L, 2 and D positions. Check that the gear change corresponds to the shift position.

Fig 24: Disconnecting Solenoid Wire

SHIFT AND GEAR POSITION

Shift Position	Gear Position
D	O/D
2	O/D
L	1st
R	Reverse
P	Pawl Lock

HINT:

If the L, 2 and D gear positions are difficult to distinguish, perform the following read test.

If any abnormalities are found in the above test, the problem is in the transaxle itself.

Connect the solenoid wire.
Clear the DTC (see PRE-CHECK ).

RESET MEMORY
CAUTION: Perform the RESET MEMORY (AT initialization) after replacing the automatic transaxle assembly, engine assembly or the ECM.

NOTE: Hand-held tester only

HINT:

The ECM memorizes the condition of the automatic transaxle assembly and engine assembly to control them according to their characteristics. Therefore, when the automatic transaxle assembly, engine assembly, or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize new information.

Reset procedure is as follows:
1. Turn the ignition switch OFF.
2. Connect the hand-held tester to the DLC3.
3. Turn the ignition switch ON and turn the hand-held tester main switch on.
4. Enter the following menus: DIAGNOSIS/ENHANCED OBD II.
5. Perform the reset memory procedure from the ENGINE menu.
CAUTION: After performing the RESET MEMORY, be sure to perform the ROAD TEST .

Fig 25: Tester Menu Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002