Toyota Corolla Cross: Communication between ECUs connected by LIN Bus off (B278588)
DESCRIPTION
If the certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 seconds or more, DTC B278588 will be stored.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B278588 |
Communication between ECUs connected by LIN Bus off |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
- Before replacing the certification ECU (smart key ECU assembly) or ID code
box (immobiliser code ECU), refer to Registration.
- for HEV Model: Click here
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- for Gasoline Model: Click here
- for HEV Model: Click here
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - EACH ECU) |
(a) Disconnect the I222 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the I20 ID code box (immobiliser code ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
NOTICE:
Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
I222-8 (LIN) - I20-2 (LIN1) |
Ignition switch off |
Below 1 Ω |
|
I222-8 (LIN) - Body ground |
Always |
10 kΩ or higher |
|
I20-2 (LIN1) - Body ground |
Always |
10 kΩ or higher |
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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|
2. |
CLEAR DTC |
(a) Connect the I222 certification ECU (smart key ECU assembly) connector.
(b) Connect the I20 ID code box (immobiliser code ECU) connector.
(c) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
|
3. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes|
Result |
Proceed to |
|---|---|
|
B278588 is not output |
A |
|
B278588 is output |
B |
| A | |
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
| B | |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
READ NEXT:
ID-BOX Missing Message (B278987)
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart
key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or
more.
DTC N
Power Source Control System Missing Message (B278C87)
DESCRIPTION
When an internal malfunction is detected in the certification ECU (smart key
ECU assembly), this DTC is stored.
DTC No.
Detection Item
DTC Detection Co
SEE MORE:
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 deciding whether
a part is faulty or not.
HINT:
Using the GTS to read the Data List allows the values
Refrigerant Pressure Sensor Circuit Short to Battery or Open (P053015)
DESCRIPTION The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value accordin
