Toyota Sienna 2010-2023 Owners Manual: If your vehicle overheats
The following may indicate that your vehicle is overheating.
- The needle of the engine coolant temperature gauge enters the red zone or a loss of engine power is experienced. (For example, the vehicle speed does not increase.)
- The warning message indicating overheats is shown on the multiinformation display.
- Steam is coming from under the hood.
Correction procedures
- Stop the vehicle in a safe place and turn off the air conditioning system, and then stop the engine.
- If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam: Carefully lift the hood.
- After the engine has cooled down sufficiently, inspect the hoses and radiator core (radiator) for any leaks.
- Radiator
- Cooling fans
If a large amount of coolant leaks, immediately contact your Toyota dealer.
- The coolant level is satisfactory if it is between the “FULL” and “LOW” lines on the reservoir.
- Reservoir
- “FULL” line
- “LOW” line
- Radiator cap
- Add coolant if necessary.
Water can be used in an emergency if coolant is unavailable.
- Start the engine and turn the air conditioning system on to check
that the radiator cooling fans operate and to check for coolant leaks
from the radiator or hoses.
The fans operate when the air conditioning system is turned on immediately after a cold start. Confirm that the fans are operating by checking the fan sound and air flow. If it is difficult to check these, turn the air conditioning system on and off repeatedly. (The fans may not operate in freezing temperatures.)
- If the fans are not operating:
Stop the engine immediately and contact your Toyota dealer.
If the fans are operating: Have the vehicle inspected at the nearest Toyota dealer.
| WARNING When inspecting under the hood of your vehicle Observe the following precautions. Failure to do so may result in serious injury such as burns.
|
| NOTICE When adding engine coolant Add coolant slowly after the engine has cooled down sufficiently. Adding cool coolant to a hot engine too quickly can cause damage to the engine. To prevent damage to the cooling system Observe the following precautions:
|
If the battery is
discharged
The following procedures may be used to start the engine if the
vehicle’s battery is discharged.
You can call your Toyota dealer or qualified repair shop.
If you have a set of jumper (or booste ...
If the vehicle becomes
stuck
Carry out the following procedures if the tires spin or the vehicle
becomes stuck in mud, dirt, or snow:
Stop the engine. Set the parking brake and shift the shift lever to P.
Remove the mud, s ...
Other materials:
Data list / active test
1. DATA LIST
HINT:
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-intrusive inspection can be very useful because
intermittent conditions or signals may be discovered ...
How to proceed with
troubleshooting
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS
3 CHECK INITIAL CHECK FUNCTION
4 PROBLEM SYMPTOMS TABLE
THE CORRESPONDING SYSTEM DOES NOT EXIST (Go to step 5)
5 BASED ON THE MALFUNCTION SYMPTOM, PERFORM THE TROUBLESHOOTING
BELOW
Operation check (C).
Terminals of ECU
6 ...
On-vehicle inspection
1. INSPECT THROTTLE BODY
(a) Listen to the throttle control motor operating sounds.
(1) Turn the ignition switch to the ON position.
(2) When pressing the accelerator pedal position
sensor lever, listen to the running motor. Make
sure that no friction noise comes from the
motor.
If fricti ...
