2003 LEXUS LS430 Factory Repair Manual

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Page 2713 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 35: DTC Freeze Frame Specification Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. DLC3 (Data Link Connector 3) The vehicle's ECM uses the ISO 15765-4 for communication protocol. The termina

Page 2714 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 36: Identifying DLC3 Terminals Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. DLC3 REFERENCE TABLE SymbolTerminal No.Name Reference terminal ResultCondition SIL7Bus "+" line5 - Signal g

Page 2715 of 4500

LEXUS LS430 2003 Factory Repair Manual CHECK BATTERY VOLTAGE Battery voltage: 11 to 14 V If voltage is below 11 V, replace the battery before proceeding. CHECK MIL a. Check that the MIL illuminates when turning the ignition switch O

Page 2716 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 37: Connecting Hand Held Tester To DLC3 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again.

Page 2717 of 4500

LEXUS LS430 2003 Factory Repair Manual 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. In check m

Page 2718 of 4500

LEXUS LS430 2003 Factory Repair Manual f. Change the ECM to check mode. Make sure the MIL flashes as shown in the illustration. g. Start the engine. The MIL should turn off after the engine starts. h. Perform "MONITOR DRIVE PATTERN&

Page 2719 of 4500

LEXUS LS430 2003 Factory Repair Manual This function minimizes the loss of the ECT functions when any malfunction occurs in each sensor or solenoid. Fig. 40: Identifying Fail -Safe Chart Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. *1:

Page 2720 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 41: Identifying Electric Malfunction Chart (1 Of 2) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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