Toyota Corolla Cross: Diagnosis System
Toyota Corolla Cross (2022-2025) Service Manual / Power Source & Network / Networking / Lin Communication System / 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 GTS 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 ignition switch off.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery.
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Data List / Active Test
DATA LIST / ACTIVE TEST
DATA LIST
NOTICE:
In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when decidi
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
LIN Communication System
DTC No.
Detection Item
Link
B120687
P/W Master SW System Missing Message
P/W Master SW System Missing Message (B120687,B127387,B232187-B232487)
DESCRIPTION
This DTC is stored when LIN communication between the main body ECU (multiplex
network body ECU) and multiplex network master switch assembly, front power window
regulator motor assem
SEE MORE:
Calibration
CALIBRATION
POWER STEERING ECU INITIAL SETTING (ASSIST MAP WRITING) (USING GTS)
NOTICE:
If any of the following conditions are met, perform Power Steering ECU Initial
Setting (assist map writing):
The power steering ECU assembly has been replaced.
The electric power steering column sub-a
Disassembly
DISASSEMBLY CAUTION / NOTICE / HINT COMPONENTS (DISASSEMBLY)
Procedure Part Name Code
1 AIR FILTER COVER PLATE
88899M -
- -
2 CLEAN AIR FILTER
87139C -
- -
3 BLOWER MOTOR WITH FAN SUB-ASSEMBLY
87103B -
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