Toyota Corolla Cross: Terminals Of Ecu
TERMINALS OF ECU
NOTICE:
- After the ignition switch is turned off, there may be a waiting time before
disconnecting the negative (-) auxiliary battery terminal.
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- When disconnecting and reconnecting the auxiliary battery.
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY
(a) Remove the power distribution box assembly and the main body ECU (multiplex network body ECU).
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(b) Connect the power distribution box assembly connectors.
(c) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|
|
MB-13 (GND1) - Body ground |
Ground |
Always |
Below 1 Ω |
|
MB-14 (GND2) - Body ground |
Ground |
Always |
Below 1 Ω |
|
MB-26 (BECU) - Body ground |
Auxiliary battery power supply |
Ignition switch off |
11 to 14 V |
|
MB-27 (IGR) - Body ground |
Ignition power supply (IG signal) |
Ignition switch ON |
11 to 14 V |
(d) Install the power distribution box assembly and the main body ECU (multiplex network body ECU).
(e) Measure the voltage and check for pulses according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|
|
8E-5 - Body ground |
CXPI communication line |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
Pulse generation |
||
|
8F-43 - Body ground |
Rear window defogger signal (output) |
Rear window defogger switch off |
Below 1.5 V |
|
Rear window defogger switch on |
8 to 14 V |
||
|
8F-38 - Body ground |
Back-up light output |
Ignition switch ON, shift position is not R |
Below 1.5 V |
|
Ignition switch ON, shift position is R |
8 to 14 V |
||
|
8C-4 - Body ground |
DOME CUT relay output |
Ignition switch off |
8 to 14 V |
|
8F-20 - Body ground |
|||
|
8B-2 - Body ground |
Mirror heater drive voltage (output) |
Rear window defogger switch off |
Below 1.5 V |
|
Rear window defogger switch on |
8 to 14 V |
||
|
8F-30 - Body ground |
Tail light output |
Tail light not illuminated |
Below 1.5 V |
|
Tail light illuminated |
8 to 14 V |
||
|
8F-25 - Body ground |
Front fog light output |
Tail light illuminated, front fog light switch off |
8 to 14 V |
|
Tail light illuminated, front fog light switch on |
Below 1.5 V |
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Data List / Active Test
DATA LIST / ACTIVE TEST
READ 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 d
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Power Integration System
DTC No.
Detection Item
Link
B235504
Power Distribution Box System Internal Failure
VEHICLE CONTROL HISTORY (RoB)
VEHICLE CONTROL HISTORY (RoB)
NOTICE:
Make sure to record any output Vehicle Control History codes before clearing
them and checking the Vehicle Control History again.
CHECK VEHICLE CONTROL HISTO
SEE MORE:
Installation
INSTALLATION
CAUTION / NOTICE / HINT
COMPONENTS (INSTALLATION)
Procedure
Part Name Code
1
MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
-
-
-
2
WIRI
Fuel Pump Control Circuit
DESCRIPTION The fuel pump (for low pressure side) circuit consists of the ECM, fuel pump (for low pressure side) and fuel pump control ECU (which operates the fuel pump (for low pressure side)). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty
