Toyota Sienna Service Manual: Diagnosis system

Toyota Sienna Service Manual / Door lock / Wireless door lock control system / Diagnosis system

1. DESCRIPTION

When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the intelligent tester to the vehicle and reading various data output from the vehicle's clearance warning ECU.

The clearance warning ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.

To check the DTCs, connect the intelligent tester to the DLC3 on the vehicle. The intelligent tester enables you to erase the DTCs, activate the various actuators, and check the freeze frame data and Data List.

2. CHECK DLC3

CHECK DLC3

The ECU uses ISO 15765-4 for communication.
The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness or connector.

CHECK DLC3

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.

HINT: If the display shows a communication error message after connecting the intelligent tester to the DLC3 and turning the ignition switch to the ON position, there is a problem with either the vehicle or the tool (intelligent tester only).

If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual

Terminals of ECU

1. INSTRUMENT PANEL JUNCTION BLOCK (MULTIPLEX NETWORK BODY ECU) Disconnect the B6, B7 and B9 ECU connectors. Disconnect the 1A, 1C, 1K, 1L and 1P J/B connectors. Check the vol ...

DTC check / clear

1. DTC CHECK/CLEAR (USING INTELLIGENT TESTER:) DTC check Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position. Read the DTCs on t ...

Other materials:

Removal
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 2. DRAIN ENGINE COOLANT 3. REMOVE FRONT WIPER ARM HEAD CAP (See page WW-4) 4. REMOVE FRONT WIPER ARM RH (See page WW-4) 5. REMOVE FRONT WIPER ARM LH (See page WW-4) 6. REMOVE COWL TOP VENTILATOR LOUVER SUBASSEMBLY (See page WW-4) 7. REMOVE ...

Reassembly
1. INSTALL RACK STEERING PISTON RING (a) Coat a new O-ring with power steering fluid and install it onto the power steering rack. (b) Expand a new rack steering piston ring with your fingers. NOTICE: Be careful not to over expand the rack steering piston ring. (c) Coat a new rack steer ...

Ambient temperature sensor circuit
DTC B1412/12 Ambient Temperature Sensor Circuit DESCRIPTION The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioner "AUTO" mode. This sensor is connected to the A/C amplifier and detects fl ...