2003 LEXUS LS430 Identifying ac

Fig. 2: Identifying Electronic Controlled Automatic Transmission Components Location (2 Of 2)
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SYSTEM DIAGRAM
The configuration of the electronic control system in the A761E automatic transmission is as shown in the
following chart.

Fig. 12: Identifying Road Test Flow Chart
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LIST OF DISABLE A MONITOR
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. 19: Identifying Vehicle Speed Pattern
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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 the lock-up condition.
PROBLEM SYMPTOMS TABLE
HINT:
If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check
the electrical circuits for each symptom in the order given in the following charts.
The Matrix Chart is divided into 2 chapters.
1.Chapter 1: Electronic Circuit Matrix Chart
Refer to the table below when the trouble cause is considered to be electrical.
If the instruction "Proceed to next circuit inspection shown on matrix chart" is given in the flow
chart of each circuit, proceed to the circuit with the next highest number in the table to continue the
check.

TERMINALS OF ECM
1.ECM
Fig. 24: Identifying ECM Connector Terminals

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HINT:
Each ECM terminal's standard voltage is shown in the table below.
In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the
terminals to inspected. The standard voltage between the terminals is shown under "Specific Condition".
Use the illustration above as a reference for the ECM terminals.

Fig. 25: Identifying ECM Terminals Reference Chart
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Waveform 1
Fig. 26: Identifying Waveform 1

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Reference:
WAVEFORM 1 REFERENCE TABLE
Waveform 2
TerminalSLT+ - SLT-
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed

Fig. 27: Identifying Waveform 2
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Reference:
WAVEFORM 2 REFERENCE TABLE
Waveform 3
TerminalSLU+ - SLU-
Tool setting5V/DIV, 1ms/DIV
Vehicle condition5th (lock-up) or 6th (lock-up) gear

Fig. 28: Identifying Waveform 3
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Reference:
WAVEFORM 3 REFERENCE TABLE
Waveform 4
TerminalSL2+ - SL2-
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed

Fig. 29: Identifying Waveform 4
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Reference:
WAVEFORM 4 REFERENCE TABLE
Waveform 5
TerminalSL1+ - SL1-
Tool setting5V/DIV, 1ms/DIV
Vehicle condition5th or 6th gear