METER / GAUGE SYSTEM (for 1KD-FTV) Tachometer Malfunction

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (DTCS RELATED TO ECD SYSTEM)

   
   

   1. Connect the intelligent tester to the DLC3

   2. Turn the ignition switch ON and turn the intelligent tester ON.

   3. Enter the following menus: Powertrain / Engine and ECT / DTC.

   4. Read the DTCs.

      Result
      Result Proceed to No output A DTCs related to ECD system B

   
   

   B

   GO TO DTC CHART (ECD SYSTEM) Click here

   A

2. CHECK COMBINATION METER ASSEMBLY

   

   
   

   1. Check the input signal waveform.

      
      

      1. Remove the combination meter assembly with the connector still connected.

      2. Connect the oscilloscope to terminal C13-35 and the body ground.

      3. Start the engine.

      4. 

         Text in Illustration

         *a	Component with harness connected (Combination Meter Assembly)

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

         Item	Condition
         Tool setting	5 V/DIV, 10 msec/DIV
         Vehicle condition	Engine idle speed

         OK
         As shown in the illustration

      As the vehicle speed increases, the cycle of the signal waveform narrows.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) Click here

   OK

   REPLACE COMBINATION METER ASSEMBLY

3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)

   

   Text in Illustration

   *a	Rear view of wire harness connector (to Combination Meter Assembly)
   *b	Rear view of wire harness connector (to ECM)

   
   

   1. Disconnect the C13 combination meter connector.

   2. Disconnect the E7 ECM connector.

   3. Measure the resistance.

      Standard resistance
      Tester Connection Specified Condition C13-35 - TACH (E7-4) Below 1 Ω C13-35 or TACH (E7-4) - Body ground 10 kΩ or higher

   4. Reconnect the connectors.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE ECM Click here