Toyota Sienna Service Manual: Diagnosis system
1. CHECK DLC3
- The ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
NOTICE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors.
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT: If the display shows an error message after having connected the cable of the intelligent tester to the DLC3, turned the ignition switch to the ON position, and operated the tester, there is a problem on either the vehicle side or the tool side.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
Terminals of ECU
1. COMBINATION METER ASSEMBLY
*1: with Power Rear No. 2 Seat with Stowing Function
*2: with Theft Deterrent System
Waveform 1 (Reference) : Using an oscilloscope:
OK ...
Data list / active test
1. DATA LIST
Using the intelligent tester to read the Data List allows
the values or states of switches, sensors, actuators and
other items to be read without removing any parts. This
non-intrusiv ...
Other materials:
Unlock Warning Switch Circuit
DESCRIPTION
The unlock warning switch detects if the key is in the ignition key cylinder.
The unlock warning switch turns on when the key is inserted into the ignition
key cylinder and turns off
when the key is removed from the cylinder.
The body ECU is connected to the unlock warning swit ...
Removal
1. REMOVE FRONT EXHAUST PIPE ASSEMBLY
HINT:
(See page EX-8)
2. REMOVE PROPELLER WITH CENTER BEARING
SHAFT ASSEMBLY
HINT:
(See page PR-3)
3. REMOVE REAR DIFFERENTIAL FILLER PLUG
(a) Using a hexagon wrench (10 mm), remove the filler
plug and gasket.
4. REMOVE REAR DIFFERENTIAL DRAIN PLUG
(a ...
Purpose of readiness tests
The On-Board Diagnostic (OBD II) system is
designed to monitor the performance of emissionrelated
components, and indicate any detected
abnormalities with DTCs (Diagnostic Trouble Codes).
Since various components need to be monitored in
different driving conditions, the OBD II system ...
