LEXUS LS430 2003 Factory Repair Manual

Fig. 15: Fault Code Specification (3 Of 6)
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Fig. 16: Fault Code Specification (4 Of 6)
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Fig. 17: Fault Code Specification (5 Of 6)
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Fig. 18: Fault Code Specification (6 Of 6)
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MONITOR DRIVE PATTERN
1.MONITOR DRIVE PATTERN FOR ECT 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. 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.

<002c004900030057004b0048000300570055005200580045004f0048000300560057004c004f004f00030052004600460058005500560003004800590048005100030057004b00520058004a004b00030057004b0048005500480003004400550048000300
51005200030044004500510052005500500044004f004c0057[ies in any of the other circuits, check
and replace the ECM.
HINT:
*1: When the circuit on which mark *1 is attached is a malfunction, DTC could be output (see
DIAGNOSTIC TROUBLE CODE CHART
).
Fig. 20: Chapter 1 Problem Symptoms Table (1 Of 2)

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Fig. 21: Chapter 1 Problem Symptoms Table (2 Of 2)

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2.Chapter 2: On-Vehicle Repair and Off-Vehicle Repair
(See A761E OVERHAUL
article for mechanical repair information.)

Fig. 22: Chapter 2 Problem Symptoms Table (1 Of 2)