Toyota Sienna Service Manual: Diagnosis system
1. CHECK DLC3
(a) The vehicle's ECM uses the ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
HINT: Connect the cable of the intelligent tester to the DLC3, turn the ignition switch to the ON position and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
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.
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.
Terminals of ecu
1. A/C AMPLIFIER
(a) Waveform 1:
(b) Waveform 2:
(c) Waveform 3: ...
Dtc check / clear
1. DTC CHECK (SENSOR CHECK)
(a) After the indicator check is completed, the system
enters the DTC check mode automatically.
(b) Read the codes displayed on the panel. Refer to the
list of co ...
Other materials:
Diagnosis system
DESCRIPTION
(a) When troubleshooting OBD II (On-Board
Diagnostics) vehicles, an intelligent tester
(complying with SAE J1987) must be connected to
the DLC3 (Data Link Connector 3) of the vehicle.
Various data in the vehicle's ECM (Engine Control
Module) can be then read.
(b) OBD II regu ...
DTC check / clear
1. CHECK DTC (USING INTELLIGENT TESTER)
Checking DTCs.
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON.
Read DTCs by following the prompts on the
tester screen.
HINT:
Refer to the intelligent tester operator's manual
for further deta ...
System Too Lean/ System Too Rich
DTC P0171 System Too Lean (Bank 1)
DTC P0172 System Too Rich (Bank 1)
DTC P0174 System Too Lean (Bank 2)
DTC P0175 System Too Rich (Bank 2)
DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic
injection time. The fuel trim
consists of both the short-term ...
