СИСТЕМА ECD VC Output Circuit

DESCRIPTION

The VC voltage (5 V) is generated in the ECM. The voltage is used to supply power to the manifold absolute pressure sensor and accelerator pedal position sensor.

WIRING DIAGRAM

• For the circuit diagram of the ECM power source circuit.

  Click here

• VC Power Source Circuit

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK CONNECTION BETWEEN GTS AND ECM

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON and GTS on.

   3. Check the communication between the GTS and ECM.

      Result
      Condition Proceed to Communication is not possible A Communication is possible B

   
   

   B

   GO TO MIL CIRCUIT Click here

   A

2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)

   
   

   1. Turn the ignition switch to ON.

   2. 

      *a	Component with harness connected (ECM)

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

      Standard Voltage
      Tester Connection Condition Specified Condition G121-1 (+B) - C127-5 (E1) IG ON 11 to 14 V

      Tech Tips

      If the result is not as specified, since current is not flowing to the +B terminals of the ECM, the system may not be started.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO ECM POWER SOURCE CIRCUIT Click here

   OK

3. CHECK CONNECTION BETWEEN GTS AND ECM (ACCELERATOR PEDAL POSITION SENSOR)

   
   

   1. Disconnect the accelerator pedal position sensor connector.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Check the communication between the GTS and ECM.

      Tech Tips

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to Communication is possible A Communication is not possible B

   5. Reconnect the accelerator pedal position sensor connector.

   
   

   B

   REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here

   A

4. CHECK CONNECTION BETWEEN GTS AND ECM (MANIFOLD ABSOLUTE PRESSURE SENSOR)

   
   

   1. Disconnect the manifold absolute pressure sensor connector.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Check the communication between the GTS and ECM.

      Tech Tips

      It can be checked using the "Engine" item of the Data List.

      Result
      Result Proceed to Communication is possible A Communication is not possible B

   5. Reconnect the manifold absolute pressure sensor connector.

   
   

   B

   REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Click here

   A

5. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

   
   

   1. Disconnect the manifold absolute pressure sensor connector.

   2. Disconnect the accelerator pedal position sensor connector.

   3. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition C128-24 (VCPM) - Body ground and other terminals Always 10 kΩ or higher G121-26 (VCPA) - Body ground and other terminals Always 10 kΩ or higher G121-23 (VCP2) - Body ground and other terminals Always 10 kΩ or higher G121-1 (+B) - Body ground and other terminals Always 10 kΩ or higher

   5. Reconnect the manifold absolute pressure sensor connector.

   6. Reconnect the accelerator pedal position sensor connector.

   7. Reconnect the ECM connector.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR