Toyota Sienna Service Manual: Diagnosis Circuit
DESCRIPTION
DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are displayed by blinking the SRS warning light.
HINT:
- When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
- A DTC output mode signal is transmitted through BEAN and CAN to each ECU including the center airbag sensor assembly. Thus when all systems do not enter DTC output mode, there may be an ECM malfunction
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK MULTIPLEX COMMUNICATION SYSTEM
- Check if the multiplex communication system DTC is output.
HINT: The center airbag sensor assembly of this system is connected to the multiplex communication system.
Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.
OK: The Multiplex communication system DTC is not output.
REPAIR CIRCUITS INDICATED BY
OUTPUT
DTCS
2 CHECK CAN COMMUNICATION SYSTEM
- Use the intelligent tester to check if the CAN communication system is functioning normally.
HINT: The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.
OK: The CAN communication system is functioning normally.
REPAIR CAN COMMUNICATION
CIRCUIT
3 CHECK WIRE HARNESS (TC OF DLC3 - TC OF ECM)
- Turn the ignition switch to the LOCK position.
- Disconnect the connector from the ECM.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPAIR OR REPLACE WIRE
HARNESS (TC
OF DLC3 - TC OF ECM)
4 CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPAIR OR REPLACE WIRE
HARNESS (CG
OF DLC3 - BODY GROUND)
5 CHECK WIRE HARNESS (TC OF DLC3 - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPAIR OR REPLACE WIRE
HARNESS OR
EACH ECU
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
SRS Warning Light does not Come ON
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK BATTERY
Measure the voltage of the battery.
Standard voltage:
11 to 14 V
CHECK AND REPLACE BATTERY OR
CHARGING SYSTEM
2 CHECK CO ...
Other materials:
The Other Caller's Voice cannot be Heard, is too Quiet, or Distorted
INSPECTION PROCEDURE
1 CHECK CELLULAR PHONE
Check if the voice on the other side can be heard using a
cellular phone.
OK:
Voice can be heard
2 CHECK NAVIGATION SYSTEM
Check that navigation sound can be heard from the
driver side speaker.
OK:
Audio sound can be heard
3 CHECK SE ...
Disassembly
1. REMOVE BRAKE MASTER LESS RESERVOIR TANK CYLINDER SUB-ASSEMBLY
(a) Using soft jaws on the vise, hold the brake master
cylinder in a vise through aluminum plates.
(b) Using a screwdriver, remove the O-ring.
(c) Using SST, remove the brake tube from the brake
master cylinder.
SST 09023 ...
Engine oil pressure switch
ON-VEHICLE INSPECTION
1. INSPECT ENGINE OIL PRESSURE SWITCH
ASSEMBLY
Disconnect the connector from the oil pressure
switch assembly.
With the switch still installed, measure the
resistance between the terminal of the engine oil
pressure switch and engine ground.
Standard ...
