METER / GAUGE SYSTEM Fuel Economy Meter Malfunction

DESCRIPTION

The combination meter assembly communicates with the ECM and skid control ECU via the CAN communication system. The combination meter calculates the current fuel consumption based on a vehicle speed signal from the skid control ECU, a fuel injection signal from the ECM.

WIRING DIAGRAM

A01ETDDE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output Click here.

      Result
      Result Proceed to
      CAN communication DTC is not output. A
      CAN communication DTC is output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FUEL CONSUMPTION METER OPERATION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter following menus: Body / Combination Meter / Active Test.

    5. Check the operation by referring to the table below.

      Combination Meter:
      Tester Display Test Part Control Range Diagnostic Note
      Fuel Consumption Meter Operation Fuel receiver gauge OFF, MIN, 1/4, 1/2, 3/4, MAX -
      OK
      Needle indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED, INJECTION VOLUM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus:


      1. for ABS/VSC/TRC: Chassis / ABS/VSC/TRC / Data List.

      2. for Engine and ECT: Powertrain / Engine and ECT / Data List.

    5. Check the values by referring to the table below.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Injection Volum (Cylinder 1) Injection volume (cylinder 1)/Min.: 0 ml, Max.: 2.047 ml 0 to 0.5 ml

      • Stored as Freeze Frame Data

      • This is the fuel injection volume for 10 injections.

      Results of real-vehicle check (for 2AR-FE):


      • Idling (engine warmed up): 0.108 ml

      • Running without load (3000 rpm): 0.097 ml

      Results of real-vehicle check (for 2GR-FE):


      • Idling (engine warmed up): 0.083 ml

      • Running without load (3000 rpm): 0.093 ml

      • Vehicle driven at constant speed of 60 km/h (37 mph): 0.197 ml

      Results of real-vehicle check (for 1AZ-FE):


      • Idling (engine warmed up): 0.087 ml

      • Running without load (3000 rpm): 0.089 ml
      Result
      Result Proceed to
      The data list value displayed on the intelligent tester is within the normal condition. A
      The data list value displayed on the intelligent tester differs from the normal condition. (ABS/VSC/TRC) B
      The data list value displayed on the intelligent tester differs from the normal condition. (Engine and ECT) (for 2AR-FE) C
      The data list value displayed on the intelligent tester differs from the normal condition. (Engine and ECT) (for 2GR-FE) D
      The data list value displayed on the intelligent tester differs from the normal condition. (Engine and ECT) (for 1AZ-FE) E

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly is suspected.

      • When the Data List values of the ECUs do not match, a signal output error of the skid control ECU or an internal malfunction of the combination meter assembly is suspected.


    B

    GO TO BRAKE CONTROL SYSTEM Click here

    C

    GO TO SFI SYSTEM (for 2AR-FE) Click here

    D

    GO TO SFI SYSTEM (for 2GR-FE) Click here

    E

    GO TO SFI SYSTEM (for 1AZ-FE) Click here

    A

  4. REPLACE BRAKE ACTUATOR ASSEMBLY


    1. Replace the brake actuator assembly with a new or a known good one Click here.

      Result
      Result Proceed to
      The operation of the fuel economy meter returns to normal. A
      The operation of the fuel economy meter does not return to normal. B

    B

    REPLACE ECM Click here

    A

    END

  5. REPLACE ECM


    1. Replace the ECM with a new or a known good one Click here for 2AR-FE, Click here for 2GR-FE, Click here for 1AZ-FE).

      Result
      Result Proceed to
      The operation of the fuel economy meter returns to normal. A
      The operation of the fuel economy meter does not return to normal. B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

    END