Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001PCHE
Model Year Start: 2020 Model: RAV4 HV Prod Date Range: [06/2020 - 08/2020]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1476; A/C Inverter Load System Malfunction; 2020 MY RAV4 HV [06/2020 - 08/2020]

DTC

B1476

A/C Inverter Load System Malfunction

DESCRIPTION

The operation of the compressor with motor assembly is stopped and this DTC is stored if the rotation load is too large or too small while the compressor with motor assembly is operating.

Possible causes are refrigerant leaks, overcharged refrigerant, insufficient cooling due to a condenser fan circuit malfunction, or compressor lock.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1476

A/C Inverter Load System Malfunction

  • Diagnosis condition: Compressor operation request
  • Malfunction status: Motor rotation load while the compressor is operating is too large or too small
  • Detection time: None
  • Refrigerant volume
  • Compressor with motor assembly
  • Cooling fan system
  • CAN communication system

Memorized

CAUTION / NOTICE / HINT

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
    • for 2WD: 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): PRECAUTION
    • for AWD: 2019 - 2024 MY RAV4 HV [02/2019 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for AWD with NICKEL METAL HYDRIDE BATTERY): PRECAUTION
    • for LITHIUM-ION BATTERY: 2020 - 2024 MY RAV4 HV [06/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): PRECAUTION
  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

Click here 2019 - 2024 MY RAV4 HV [02/2019 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

Result

Proceed to

CAN communication system DTCs are not output

A

CAN communication system DTCs are output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ENGINE COOLING FAN DUTY RATIO)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Active Test.

(e) Check the operation by referring to the table below.

Powertrain > Engine > Active Test

Tester Display

Measurement Item

Control Range

Restrict Condition

Control the Engine Cooling Fan Duty Ratio

Electric cooling fan motor operation

0 to 100 (%)

Perform this test when vehicle is stopped.

Powertrain > Engine > Active Test

Tester Display

Control the Engine Cooling Fan Duty Ratio

OK:

Electric cooling fan operates smoothly.

NG

GO TO COOLING FAN SYSTEM

OK

3.

CHECK REFRIGERANT PRESSURE

(a) Install a manifold gauge set.

  • for HFC-134a (R134a): 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): ON-VEHICLE INSPECTION
  • for HFO-1234yf (R1234yf): 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): ON-VEHICLE INSPECTION

(b) Turn the ignition switch to ON (READY).

(c) Read the manifold gauge pressure when the following conditions are met.

(1) Prepare the vehicle according to the table below.

Measurement Condition:

Item

Condition

Vehicle Condition

Ignition switch ON (READY)

Doors

Fully closed (windows also fully closed)

A/C Switch

On

Recirculation/fresh Control Switch

Recirculation

Set Temperature

MAX COLD

Blower Speed

HI

Air Conditioning Air Inlet Temperature

25 to 35°C (77 to 95°F)

Standard Pressure:

Low pressure side

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

NG

CHARGE REFRIGERANT

  • for HFC-134a (R134a): 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): REPLACEMENT
  • for HFO-1234yf (R1234yf): 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): REPLACEMENT