Lexus ES: System Diagram
SYSTEM DIAGRAM
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
*: Use the Techstream
Use the following procedure to troubleshoot the hybrid control system.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Utility
UTILITY HINT:
With "All Readiness", you can check whether or not the DTC judgment has been completed by using the Techstream.
You should check "All Readiness" after simulating malfunction symptom
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE Hybrid Control System Symptom Suspected Area Link Cannot enter EV drive mode CAN communication system Pattern Select Switch EV Mode Circuit EV mod
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Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE OIL PUMP RELIEF VALVE (a) Using a 27 mm socket wrench, remove the oil pump relief valve plug from the oil pump cover sub-assembly. *1 Oil Pump Relief Valve *2 Oil Pump Relief Valve Spring *3 Oil Pump Relief Valve Plug (b) Remove
Hybrid/EV Battery Negative Contactor Actuator Stuck Closed (P0AA373)
DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU detects a stuck closed malfunction of a system main relay on the HV battery negative side. The cause of this malfunction may be one of the following: Inverter voltage sensor (VH) internal circuit malfunction
Voltage sensor (VH) ma
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