Toyota CH-R Service Manual: Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine speed signals from the ECM via CAN communication. The combination meter assembly displays the engine speed calculated based on the data received from the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the ECM, refer to Registration
    • w/ Smart Key System:

      Click here

    • w/o Smart Key System:

      Click here

  • 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.

PROCEDURE

1.

CHECK FOR DTC (METER / GAUGE SYSTEM)

(a) Check if meter / gauge system DTCs are output.

Click here

Body Electrical > Combination Meter > Trouble Codes

Result

Proceed to

Meter / gauge system DTCs are not output.

A

Meter / gauge system DTCs are output.

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK FOR DTC (SFI SYSTEM)

(a) Check if SFI system DTCs are output.

  • w/ Canister Pump Module:

    Click here

  • w/o Canister Pump Module:

    Click here

Powertrain > Engine and ECT > Trouble Codes

Result

Proceed to

SFI system DTCs are not output.

A

SFI system DTCs are output.

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

PERFORM ACTIVE TEST USING TECHSTREAM (ENGINE SPEED, ENGINE RPM)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus:

(1) for Engine: Powertrain / Engine and ECT / Data List.

(2) for Combination Meter: Body Electrical / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

(1) Engine and ECT

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed

Min.: 0 rpm, Max.: 16383 rpm

710 to 810 rpm: Idling with warm engine

When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

(2) Combination Meter.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Engine Rpm

Engine speed

Min.: 0 rpm, Max.:12750 rpm

Almost the same as actual tachometer

-

Body Electrical > Combination Meter > Data List

Tester Display

Engine Rpm

Result

Proceed to

The Data List values of the ECUs do not match

A

The Data List values of the ECUs match

B

HINT:

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

REPLACE ECM

B

REPLACE COMBINATION METER ASSEMBLY

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