Toyota RAV4 manuals

Toyota Sienna Service Manual: Tachometer Malfunction

DESCRIPTION

The meter CPU receives the engine revolution signal from the ECM via the direct lines. The meter CPU displays engine revolution data that is calculated based on the data received from the ECM.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the switch to the ON position.
  3.  Turn the tester ON.
  4.  Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / ACTIVE TEST.
  5.  Check the operation by referring to the values in the table below.

METER:

METER

OK: Needle indication is normal.

2 READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED SIGNAL)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the switch to the ON position.
  3.  Turn the tester ON.
  4.  Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
  5.  Check the values by referring to the values in the table below

METER:

METER

OK: Engine speed displayed on the tester is almost the same as the actual engine speed.

REPLACE COMBINATION METER ASSEMBLY

3 READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED SIGNAL)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the switch to the ON position.
  3.  Turn the tester ON.
  4.  Enter the following menus: DIAGNOSIS / OBD/MOBD / ENGINE / ACTIVE TEST.
  5.  Check the values by referring to the values in the table below.

ENGINE:

ENGINE

4 CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)

  1. Disconnect the E4 and C10 connectors.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

5 INSPECT COMBINATION METER ASSEMBLY

INSPECT COMBINATION METER ASSEMBLY

  1. Check the input signal waveform.
  1.  Remove the combination meter with the connector still connected.
  2.  Connect the oscilloscope to terminal C10-37 (S) and body ground.
  3.  Start the engine.

INSPECT COMBINATION METER ASSEMBLY

  1. Check the signal waveform according to the condition(s) in the table below.

INSPECT COMBINATION METER ASSEMBLY

OK: The waveform is displayed as shown in the illustration

REPLACE ECM

Speedometer Malfunction
DESCRIPTION Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be ...

Fuel Receiver Gauge Malfunction
DESCRIPTION The meter CPU uses the fuel sender gauge assembly to determine the level of the fuel in the fuel tank. The resistance of the fuel sender gauge will vary between approximately 15 ] ...

Other materials:

Master Cylinder Pressure Sensor Malfunction
DTC C1246/46 Master Cylinder Pressure Sensor Malfunction DESCRIPTION Master cylinder pressure sensor is connected to the skid control ECU in the actuator. INSPECTION PROCEDURE 1 READ VALUE ON INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR) (a) Connect the intelligent tester to the DL ...

Removal
HINT: Use the same procedures for the RH side and LH side.  The procedures listed below are for the LH side. 1. PRECAUTION CAUTION: Be sure to read "PRECAUTION" thoroughly before servicing. 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait for 90 seconds ...

Short to B+ in Rear Curtain Shield Squib RH Circuit
DTC B1633/82 Short to B+ in Rear Curtain Shield Squib RH Circuit DESCRIPTION The rear curtain shield squib RH circuit consists of the center airbag sensor assembly and the curtain shield airbag assembly RH. The circuit instructs the SRS to deploy when deployment conditions are met. DTC B ...

В© 2011-2019 Copyright www.tsienna.net