Lexus ES: Diagnosis System
Lexus ES (XZ10) Service Manual / Power Source & Network / Networking / Lin Communication System (for Hv Model) / Diagnosis System
DIAGNOSIS SYSTEM
DESCRIPTION
The main body ECU (multiplex network body ECU) and certification ECU (smart key ECU assembly) control the LIN communication system. LIN communication system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3).
When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
CHECK DLC3
(a) Check the DLC3.
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INSPECT AUXILIARY BATTERY VOLTAGE
(a) Measure the auxiliary battery voltage with the power switch off.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery.
READ NEXT:
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body or Smart A
Terminals Of Ecu
TERMINALS OF ECU CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Disconnect the MB main body ECU (multiplex network body ECU) connector. Click here
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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SEE MORE:
Bus Buffer ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Bus Buffer ECU Communication Stop Mode Any of the following conditions are met:
Communication stop for "Accessory Gateway" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history
Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during intake manifold removal/installation are shown below. Necessary Procedures After Parts Removed/Installed
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