2003 LEXUS LS430 engine

6. Check the lock-up mechanism.
Drive in the D position (4th, 5th or 6th gear), at a steady speed (lock-up ON).
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 and 3rd gears.
If there is a big jump in engine speed, there is no lock-up.
b. S position test
Shift to the S position, depress the accelerator pedal and check the following points:
1. Check shift operation.
While driving in the D position and 6th gear, shift into the S position and back to the D
position. Check that the gear change 6 --> 5 down-shift and 5 --> 6 up-shift can be
performed.
With the shift lever in the S position (while the vehicle is stopped), shift into the "+"
position to check that the shift position on the combination meter changes as follows: 1
--> 2, 2 --> 3, 3 --> 4, 4 --> 5 and 5 --> 6.
While driving in the 5(S) position and 4th gear (at a vehicle speed of approximately 55
to 65 km/h (34 to 40 mph)), shift into the "-" position and check if the 4th gear down-
shift occurs and the engine brake performs properly.
While driving in the 4(S) position and 4th gear (at a vehicle speed of approximately 30
to 40 km/h (19 to 25 mph)), shift into the "-" position and check if the 3rd gear down-
shift occurs and the engine brake performs properly.
While driving in the 3(S) position and 3rd gear (at a vehicle speed of approximately 20
to 30 km/h (12 to 19 mph)), shift into the "-" position and check if the 2nd gear down-
shift occurs and the engine brake performs properly.
<003a004b004c004f0048000300470055004c0059004c0051004a0003004c005100030057004b004800030015000b0036000c0003005300520056004c0057004c00520051000300440051004700030015005100470003004a0048004400550003000b004400
5700030044000300590048004b004c0046004f004800030056[peed of approximately 10
to 20 km/h (6 to 12 mph)), shift into the "-" position and check if the 1st gear down-
shift occurs and the engine brake performs properly.
HINT:
Manual shift (S position) is prohibited under either of the following conditions:
Down-shifting may cause engine overrun.
The driver continuously down-shifts. (Down-shifting to 1st gear may not be performed.)
c. 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.

d. P position test:
Stop the vehicle on a grade (more than 5°) and after shifting into the P position, release the parking
brake. Then, check that the parking lock pawl holds the vehicle in place.
MECHANICAL SYSTEM TESTS
1.PERFORM MECHANICAL SYSTEM TESTS
a. Measure the stall speed.
The object of this test is to check the overall performance of the transmission and engine by
measuring the stall speeds in the D and R positions.
1. Chock the 4 wheels.
2. Connect an OBD II scan tool or hand-held tester to the DLC3.
3. Fully apply the parking brake.
4. Keep your left foot pressed firmly on the brake pedal.
5. Start the engine.
6. Shift into the D position. Press all the way down on the accelerator pedal with your right
foot.
7. Quickly read the stall speed at this time.
Stall speed: 2,400 +/- 150 rpm
8. Do the same test in the R position.
Stall speed: 2,400 +/- 150 rpm
Evaluation:

Fig. 7: Mechanical Systems Problem Symptoms Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the time lag.
1. When the shift lever is shifted 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 condition of the direct clutch,
forward clutch, and 1st and reverse brake.
2. Connect an OBD II scan tool or hand-held tester to the DLC3.
3. Fully apply the parking brake.
4. Start and warm up the engine and check idle speed.
Idle speed: approx. 700 rpm (In N position and A/C OFF)
5. Shift the lever from N to D position. Using a stop watch, measure the time from when the
lever is shifted until the shock is felt.
Time lag: N --> D less than 1.2 seconds
6. In the same way, measure the time lag for N --> R.
Time lag: N --> R less than 1.5 seconds
Evaluation (If N --> D or N --> R time lag is longer than the specified):

Fig. 8: Time Lag Problem Symptoms Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HYDRAULIC TEST
1.PERFORM HYDRAULIC TEST
a. Measure the line pressure.
1. Warm up the ATF (Automatic Transmission Fluid).
2. Lift the vehicle up.
3. Remove the test plug on the transmission case center right side and connect SST.
SST 09992-00095 (09992-00231, 09992-00271)
4. Fully apply the parking brake and chock the 4 wheels.
5. Start the engine and check idling speed.
6. Keep your left foot pressing firmly on the brake pedal and shift into D position.
7. Measure the line pressure when the engine is idling.
8. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when
en
gine speed reaches stall speed.

HINT:
The ECM memorizes the condition that the ECT controls the automatic transmission assy and engine assy
according to those characteristics. Therefore, when the automatic transmission assy, engine assy, or ECM
has been replaced, it is necessary to reset the memory so that the ECM can memorize the new
information. Reset procedure is as follows.
a. Turn the ignition switch off.
b. Connect the hand-held tester together with the CAN VIM (controller area network vehicle interface
module) to the DLC3.
c. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
d. Select the item "DIAGNOSIS/ENHANCED OBD II".
e. Perform the reset memory procedure from the ENGINE menu.
HINT:
The ECM is learned b
y performing the ROAD TEST.

a. Perform this drive pattern as one method to simulate the detection conditions of the ECT
malfunctions. (The DTCs may not be detected due the actual driving conditions. And some codes
may not be detected through this drive pattern.)
HINT:
Preparation for driving
Warm up the engine sufficiently. (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 -10 °C (14 °F) or less)
Notice in driving
Drive the vehicle through all gears.
Stop --> 1st --> 2nd --> 3rd --> 4th --> 5th --> 6th --> 6th (lock-up ON).
Perform engine brake test in the S position.
While driving in the 6(S) position and 6th gear lock-up, shift into the "-" position and down-shift
<0049005500520050000300190057004b000300570052000300180057004b000f000300180057004b000300570052000300170057004b000f000300170057004b0003005700520003001600550047000f000300160055004700030057005200030015005100
47000f00030015005100470003005700520003001400560057[.
<0026004b00480046004e00030057004b0044005700030057004b0048000300480051004a004c005100480003004500550044004e00480003005300480055004900520055005000560003005300550052005300480055004f005c0003005a004b0048005100
48005900480055000300470052005a005100100056004b004c[ft takes place.
Repeat the above driving pattern three times or more.

Fig. 25: Identifying ECM Terminals Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 1
Fig. 26: Identifying Waveform 1

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Reference:
WAVEFORM 1 REFERENCE TABLE
Waveform 2
TerminalSLT+ - SLT-
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed

Fig. 28: Identifying Waveform 3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Reference:
WAVEFORM 3 REFERENCE TABLE
Waveform 4
TerminalSL2+ - SL2-
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed