Toyota Yaris: Owner Maintenance / Engine Coolant

Toyota Yaris XP210 (2020-2026) Owner's Manual / Maintenance and Care / Owner Maintenance / Engine Coolant

Inspecting Coolant Level

Inspect the antifreeze protection and coolant level in the coolant reservoir at least once a year—at the beginning of the winter season—and before traveling where temperatures may drop below freezing.

Inspect the condition and connections of all cooling system and heater hoses.

Replace any that are swollen or deteriorated.

The coolant should be at full in the radiator and between the F and L marks on the coolant reservoir when the engine is cool.

Toyota Yaris. Engine Coolant

Cooling fan
Cooling system cap
Coolant reservoir

If it is at or near L, add enough coolant to the coolant reservoir to pro- vide freezing and corrosion protection and to bring the level to F.

Securely tighten the coolant reservoir tank cap after adding coolant.

If the coolant reservoir is empty or new coolant is required frequently, consult your Toyota dealer.

Changing the coolant should be done by your Toyota dealer.

WARNING

Do not use a match or live flame in the engine compartment. DO NOT ADD COOLANT WHEN THE ENGINE IS HOT

A hot engine is dangerous. If the engine has been running, parts of the engine compartment can become very hot. You could be burned. Carefully inspect the engine coolant in the coolant reservoir, but do not open it.

Pull over to a safe location, then switch the ignition to off and make sure the fan is not running before attempting to work near the cooling fan

Working near the cooling fan when it is running is dangerous. The fan could continue running indefinitely even if the engine has stopped and the engine compartment temperature is high. You could be hit by the fan and seriously injured.

Do not remove either cooling system cap when the engine and radiator are hot

When the engine and radiator are hot, scalding coolant and steam may shoot out under pressure and cause serious injury.

NOTICE

Radiator coolant will damage paint. Rinse it off quickly if spilled.

Use only soft (deionized) water in the coolant mixture. Water that contains minerals will cut down on the coolant’s effectiveness.

Do not add only water. Always add a proper coolant mixture.

The engine has aluminum parts and must be protected by an ethylene-glycol-based coolant to prevent corrosion and freezing.

DO NOT USE coolants Containing Alcohol, methanol, Borate or Silicate. These coolants could damage the cooling system.

DO NOT MIX alcohol or methanol with the coolant. This could damage the cooling system.

Do not use a solution that contains more than 60% antifreeze. This would reduce effectiveness.

Use of engine coolant specifically designed for the YARIS/YARIS HATCHBACK is required when replacing engine coolant. Using engine coolant that is not specifically designed for this vehicle may cause serious damage to the engine and cooling system. For questions on how to obtain this specially designed coolant, contact your Toyota dealer.

Inspecting Engine Oil Level

Be sure the vehicle is on a level surface. Warm up the engine to normal operating temperature. Turn it off and wait at least 5 minutes for the oil to return to the oil pan...

Brake/Clutch Fluid

The brakes and clutch draw fluid from the same reservoir. Inspect the fluid level in the reservoir regularly. It should be kept between the MAX and MIN lines...

Other information:

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Fail-safe Chart

FAIL-SAFE CHART If any of the following DTCs are stored, the engine stop and start ECU enters fail-safe mode to preserve vehicle operability. DTC Component Fail-safe Operation Fail-safe Deactivation Condition P033562 Open in engine speed signal circuit Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control All of the following conditions are met for 10 seconds: Normal communication with ECM Engine speed 500 rpm or higher Engine speed (communication signal) 500 rpm or higher Difference between engine speed from pulse signal and engine speed from communication signal is less than 100 rpm P055500 P05552A Vacuum sensor assembly Brake booster assembly Vacuum hose (brake booster hose) Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control One of the following conditions is met: Vacuum changes while the brake pedal is depressed Vacuum changes a specified number of times while the vehicle is being driven faster than a certain vehicle speed P055511 P055515 Vacuum sensor assembly circuit Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control Sensor output is within standard range P060629 Engine stop and start ECU Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control Pass condition detected and ignition switch turned to ON P060B1C P060B49 P060B71 Analog to digital converter (Engine stop and start ECU) Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control Pass condition detected and ignition switch turned to ON P061519 ST NO...

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Brake Booster Pressure Sensor(running) (P055500,P05552A)

DESCRIPTION The engine stop and start ECU determines changes in the brake booster assembly pressure based on the voltage signal received from the vacuum sensor assembly in the brake booster assembly. If the output value of the vacuum sensor assembly remains the same even though the brake booster assembly pressure changes when the brake pedal is operated or the vehicle is being driven, the engine stop and start ECU judges that the sensor is stuck...