Power Control System: Testing and Inspection

HYBRID / BATTERY CONTROL: COOLANT (for Inverter): ON-VEHICLE INSPECTION

1. INSPECT FOR COOLANT LEAK (for Inverter)

(a) Remove the reserve tank cap.

CAUTION:
To avoid the danger of being burned, do not remove the reserve tank cap while the coolant for the inverter is still hot.

(b) Install a radiator cap tester.





(c) Pump the radiator cap tester to 122 kPa (1.2 kgf/ cm2, 18 psi), and then check that the pressure does not drop.

HINT
If the pressure drops, check the hoses, radiator, inverter water pump assembly, inverter with converter, and hybrid vehicle transaxle assembly for leaks.

(d) Reinstall the reserve tank cap.

2. INSPECT COOLANT LEVEL IN RESERVE TANK (for Inverter)

(a) The coolant should be between the low and full lines when the coolant for the inverter is cold.

HINT
If the coolant level is low, check for leaks and add TOYOTA Super Long Life Coolant (SLLC) or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the full line.

3. INSPECT COOLANT (for Inverter)

(a) Remove the reserve tank cap.

CAUTION:
To avoid the danger of being burned, do not remove the reserve tank cap while the coolant for the inverter is still hot.

(b) Check for excessive deposits of rust or scale on and around the reserve tank cap and its opening.

HINT
If excessively dirty, replace the coolant for the inverter.

(c) Reinstall the reserve tank cap.

4. INSPECT RESERVE TANK CAP (for Inverter)

(a) Inspect the reserve tank cap.





Text in Illustration





(1) If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.

NOTICE:
Do not use any tools.

(2) Check that the O-ring is not deformed, cracked, or damaged.

(3) Check that the O-ring is not swollen.

(b) Check the reserve tank cap operation.





Text in Illustration





(1) Apply coolant (for inverter) to the O-ring and rubber packing before using a radiator cap tester.

(2) Install the reserve tank cap to the radiator cap tester.

(3) Pump the cap tester several times, and check the maximum pressure.

Judgment Criterion





NOTICE:
When using the cap tester, tilt it 30° or more.

HINT
If the maximum pressure is less than the minimum standard value, replace the reserve tank cap.