Coolant - Hybrid Drive: Testing and Inspection

HYBRID TRANSMISSION / TRANSAXLE: COOLANT (for Inverter): ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. COOLANT LEAK (for Inverter)
(a) Remove the inverter radiator cap.
CAUTION:
- To avoid the danger of being burned, do not remove the inverter radiator cap while the coolant for inverter is still hot.
- Only hold the cap when removing the inverter radiator cap. Holding other parts may cause your fingers to be caught between the cap and the protrusion on the filler tank.





(b) Install the radiator cap tester.
(c) Pump the radiator cap tester to 37 kPa (0.38 kgf/cm2, 5.4 psi), and then check that the pressure does not drop.
HINT: If the pressure drops, check the hoses, radiator, water pump, inverter with converter and hybrid vehicle transmission assembly for leakage.

(d) Reinstall the inverter radiator cap.
2. COOLANT LEVEL AT RESERVOIR (for Inverter)
(a) The coolant should be between the LOW and FULL lines when the engine is cold.
HINT: If the coolant level is low, check for leakage 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. COOLANT (for Inverter)
(a) Remove the inverter radiator reservoir cap.
CAUTION:
- To avoid the danger of being burned, do not remove the inverter radiator cap while the coolant for inverter are still hot.
- Only hold the cap when removing the inverter radiator cap. Holding other parts may cause your fingers to be caught between the cap and the protrusion on the filler tank.

(b) Check for excessive deposits of rust or scale on and around the inverter radiator cap and filler tank opening.
HINT: If excessively dirty, replace the coolant for inverter.

(c) Reinstall the inverter radiator cap.
4. INSPECT INVERTER RADIATOR CAP





(a) Check the condition of the inverter reserve tank cap.
(1) Clean all water stains and foreign matter from packing 1.
NOTE: Perform this procedure with your hands.
(2) Check that the plastic and rubber sections are not deformed, cracked, or damaged.
(3) Check that packing 1 is not swollen.





(b) Check the function of the inverter reserve tank cap.
(1) Apply engine coolant to packings 1 and 2.
(2) Using a radiator cap tester, pump several times and measure the maximum valve opening pressure.
Standard opening pressure:
15 to 44 kPa (0.15 to 0.45 kgf/cm 2.18 to 6.38 psi)
NOTICE:
- Tilt the cap tester to more than 30° when performing the inspection.
- Pump speed of 1 pump per second or faster.
HINT: If the maximum valve opening pressure is less than the minimum standard pressure, replace the reserve tank cap.