Tachometer Malfunction

METER: METER / GAUGE SYSTEM: Tachometer Malfunction
- Tachometer Malfunction

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (TACHO METER OPERATION)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the tester ON.

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

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

Combination Meter:





OK:

Needle indication is normal.

NG -- REPLACE COMBINATION METER
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (ENGINE RPM)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the tester ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Check the values by referring to the values in the table below.

Combination Meter:





OK:

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

NG -- READ VALUE USING TECHSTREAM (ENGINE SPEED)

OK -- REPLACE COMBINATION METER

3. READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the tester ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List.

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

Engine and ECT:





NG -- GO TO ENGINE CONTROL SYSTEM
OK -- Continue to next step.

4. CHECK COMBINATION METER

(a) Check the input signal waveform.





(1) Remove the combination meter with connector still connected.

(2) Connect the oscilloscope to terminal K31-27 and body ground.

(3) Start the engine.

(4) Check the signal waveform of the connector.









OK:

As shown in the illustration

OK -- REPLACE COMBINATION METER
NG -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER AND ECM)

(a) Disconnect the A6 ECM connector.

(b) Disconnect the A7 ECM connector.

(c) Disconnect the K31 meter connector.





(d) Measure the resistance according to the value(s) in the table below.

Standard resistance:





*1: 2GR-FSE

*2: 1UR-FSE

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM