Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine coolant temperature signals from the ECM via CAN communication. The combination meter assembly displays an engine coolant temperature warning based on the data received from the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • Before replacing the ECM, refer to Registration.

    Click here

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, the ECM stores DTCs. Troubleshoot the SFI system.

Click here

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

Click here

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTC (SFI SYSTEM)

(a) Check if SFI system DTCs are output.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO SFI SYSTEM

A

3.

PERFORM ACTIVE TEST USING TECHSTREAM

*a

Water Temperature Meter Operation (50C,122F)

*b

Water Temperature Meter Operation (60C,140F)

*c

Water Temperature Meter Operation (70C,158F)

*d

Water Temperature Meter Operation (80C,176F)

*e

Water Temperature Meter Operation (Middle)

*f

Water Temperature Meter Operation (110C,230F)

*g

Water Temperature Meter Operation (120C,248F)

*h

Water Temperature Meter Operation (127C,260F)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Water Temperature Meter Operation (50C,122F)

Engine coolant temperature receiver gauge (50°C, 122°F)

ON

-

Water Temperature Meter Operation (60C,140F)

Engine coolant temperature receiver gauge (60°C, 140°F)

ON

-

Water Temperature Meter Operation (70C,158F)

Engine coolant temperature receiver gauge (70°C, 158°F)

ON

-

Water Temperature Meter Operation (80C,176F)

Engine coolant temperature receiver gauge (80°C, 176°F)

ON

-

Water Temperature Meter Operation (Middle)

Engine coolant temperature receiver gauge (Middle)

ON

-

Water Temperature Meter Operation (110C,230F)

Engine coolant temperature receiver gauge (110°C, 230°F)

ON

-

Water Temperature Meter Operation (120C,248F)

Engine coolant temperature receiver gauge (120°C, 248°F)

ON

-

Water Temperature Meter Operation (127C,260F)

Engine coolant temperature receiver gauge (127°C, 260°F)

ON

-

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (50C,122F)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (60C,140F)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (70C,158F)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (80C,176F)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (Middle)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (110C,230F)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (120C,248F)

Body Electrical > Combination Meter > Active Test

Tester Display

Water Temperature Meter Operation (127C,260F)

OK:

Engine coolant temperature receiver gauge indication is normal.

OK

REPLACE ECM

NG

REPLACE COMBINATION METER ASSEMBLY

    Dtc Check / Clear

    Engine Oil Level Sensor Circuit

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