Toyota Sienna Service Manual: How to proceed with troubleshooting
NOTICE: DTCs for the CAN communication system are as follows: U0073, U0100, U0122, U0123, U0124, U0126 and U1101.
HINT: If U0235 or U1102 is output alone, the CAN communication is normal
1 CHECK AND CLEAR DTCS
HINT:
- CAN communication DTCs are output when there is an open or short in any of the communication wires. Any problems with the power source of a corresponding ECU or sensor, or problems in the ECU or the sensor itself also cause these DTCs to be output.
- If a CAN communication wire connector is disconnected with the ignition switch on (IG), the ECUs of the corresponding system and related systems record a DTC.
2 CHECK FOR INSTALLED SYSTEMS (ECUS & SENSORS) THAT ADOPT CAN COMMUNICATION)
- Check which of the following is adopted: brake control system and dynamic laser cruise control system
3 CHECK WITH INTELLIGENT TESTER
- Using the intelligent tester, display the "Communication Bus Check" screen (See page CA-17).
- Observe the screen for approximately 1 minute to check the ECUs and sensors displayed on the screen.
Result
|
Result |
Proceed to |
| All ECUs and sensors connected to the CAN communication system are
not displayed on the
screen.
(Open in CAN bus main wire or short in CAN bus wire or DLC3 branch wire malfunction) |
A |
| One of the ECUs and sensors connected to the CAN communication
system is not displayed on the
screen.
(Open in ECU or sensor branch wires, or communication interrupted) |
B |
| Some of the ECUs and sensors connected to the CAN communication
system are not displayed on
the screen. During this check, some ECUs and sensors repeatedly appear
and disappear from the
screen.
(Open in one side of ECU or sensor branch wires) |
C |
| All ECUs and sensors connected to the CAN communication system are
displayed on the screen.
(CAN bus circuit is currently normal) |
D |
NOTICE: Non-installed ECUs or sensors will not be displayed.
Do not mistake them for being in the communication stop mode.
HINT: The ECUs and sensors that repeatedly appear and disappear from the screen during this check are considered normal. (The response to the intelligent tester and the tester display are affected by signals output from other ECUs which have an open circuit in either of their CAN branch wires.)
4 CHECK CAN BUS WIRE
- Check the CAN bus wires (See page CA-35).
HINT: If the area where an open or short is occurring in a CAN bus wire can be determined, refer to the "PROBLEM SYMPTOMS TABLE"
5 DTC COMBINATION TABLE
- Confirm trouble according to the combination of output DTCs regarding the CAN communication system
6 CIRCUIT INSPECTION
7 IDENTIFICATION OF PROBLEM
8 REPAIR OR REPLACE
9 CONFIRMATION TEST
END
System description
1. BRIEF DESCRIPTION
The CAN (Controller Area Network) is a serial data
communication system for real time application. It is
a vehicle multiplex communication system which
has a high commun ...
Problem symptoms table
RESULT LIST OF CHECK CAN BUS LINE
Symptom
Suspected Area
All ECUs and sensors connected to the CAN
communication system are not displayed on intelligent
tester
CAN ...
Other materials:
Radar Sensor Malfunction
DTC P1570 Radar Sensor Malfunction
DESCRIPTION
The laser sensor emits laser beams towards an object in front and measures
the distance and direction of
the object by receiving the beam reflections. Based on the reflections, the
sensor calculates the difference
in speed between your own vehic ...
Problem symptoms table
HINT:
Before inspecting the suspected areas listed in the table
below, check the fuse and relay.
Before inspecting the suspected areas listed in the table
below, check the DTCs.
Methods used to verify the cause of the problem are listed
in order of probability in the ...
Navigation check mode
HINT:
This mode displays GPS satellite information.
Illustrations may differ from the actual vehicle depending
on the device settings and options. Therefore, some
detailed areas may not be shown exactly the same as on
the actual vehicle.
1. ENTER DIAGNOSTIC MODE ( )
2. NA ...
