Toyota 4Runner: Lost Communication with ECM (U0100,U0142,U0155)
DESCRIPTION
The air conditioning amplifier communicates with the ECM, main body ECU (multiplex network body ECU) and combination meter through the CAN communication system.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
U0100 |
Lost communication with the ECM. |
|
|
U0142 |
Lost communication with the main body ECU. |
|
|
U0155 |
Lost communication with the combination meter. |
|
PROCEDURE
|
1. |
CHECK FOR DTC (CAN COMMUNICATION SYSTEM) |
(a) Use the Techstream to check if the CAN communication system is functioning normally.
Result|
Result |
Proceed to |
|---|---|
|
CAN DTC is not output |
A |
|
CAN DTC is output |
B |
| A | .gif) |
USE SIMULATION METHOD TO CHECK |
| B | |
GO TO CAN COMMUNICATION SYSTEM |
Compressor Lock Sensor Circuit (B1422)
SYSTEM DESCRIPTION
The ECM sends the engine speed signal to the air conditioning amplifier assembly
via CAN communication.
The air conditioning amplifier assembly reads the difference between comp ...
Air Outlet Damper Control Servo Motor Circuit (B1443)
DESCRIPTION
The damper servo sub-assembly (mode damper servo) sends pulse signals to inform
the No. 1 air conditioning amplifier assembly of the damper position. The No. 1
air conditioning amplif ...
Other materials about Toyota 4Runner:
Occupant Classification ECU Malfunction (B1795)
DESCRIPTION
DTC B1795 is stored when a malfunction is detected in the occupant classification
ECU.
Troubleshoot DTC B1771 first when both DTCs B1771 and B1795 are present.
DTC Code
DTC Detection Condition
Trouble Area
...
SRS Warning Light Remains ON
DESCRIPTION
The SRS warning light is located in the combination meter.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds
after the ignition switch is turned from off to ON, and then goes off automatically.
If there is a ma ...
0.027