ECD SYSTEM (for DPF) Injector Circuit

DESCRIPTION

The injector driver drives the injectors at high speeds with a high-voltage DC/DC converter. The ECM constantly monitors the injector driver and stops the engine if an abnormal condition is detected.

WIRING DIAGRAM

Refer to DTC P0201 (Click here).

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK INJECTOR DRIVER (EDU) (POWER SOURCE)

   
   
   1. 

      Disconnect the injector driver (EDU) connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition C59-2 (+B) - C59-4 (GND) Ignition switch ON 11 to 14 V

      Table 1. Text in Illustration

      *a	Front view of wire harness connector (to Injector Driver (EDU))

   
   
   • OKClick here
   • NGClick here
2. Click here

   INSPECT INTEGRATION RELAY (EDU RELAY)

   
   

   1. Inspect the integration relay (EDU relay) (Click here).

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - EDU)

   
   

   1. Remove the integration relay from the engine room No. 1 relay block.

   2. Disconnect the injector driver (EDU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition C59-2 (+B) - 1B-8 Always Below 1 Ω C59-4 (GND) - Body ground Always Below 1 Ω C59-2 (+B) or 1B-8 - Body ground Always 10 kΩ or higher

      Table 2. Text in Illustration

      *1	Engine Room No. 1 Relay Block
      *a	Front view of wire harness connector (to EDU)
      *b	Front view of wire harness connector (to Integration Relay)

   4. Reconnect the injector driver (EDU) connector.

   5. Reinstall the integration relay.

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK)

   
   
   1. 

      Remove the integration relay from the engine room No. 1 relay block.

   2. Remove the EFI MAIN relay from the engine room No. 1 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition 1C-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition 3 (EFI MAIN relay holder) - 1B-6 Always Below 1 Ω 3 (EFI MAIN relay holder) or 1B-6 - Body ground Always 10 kΩ or higher

   5. Reinstall the integration relay.

      Table 3. Text in Illustration

      *1	Engine Room No. 1 Relay Block
      *2	EFI MAIN Relay
      *a	Front view of wire harness connector (to Integration Relay)

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)

   
   

   1. Remove the integration relay from the engine room No. 1 relay block.

   2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A51-44 (IREL) - 1B-7 Always Below 1 Ω A51-44 (IREL) or 1B-7 - Body ground Always 10 kΩ or higher

      Table 4. Text in Illustration

      *1	Engine Room No. 1 Relay Block
      *a	Front view of wire harness connector (to ECM)
      *b	Front view of wire harness connector (to Integration Relay)

   4. Reconnect the ECM connector.

   5. Reinstall the integration relay.

   
   
   • OKClick here
   • NGClick here
6. Click here

   REPLACE INJECTOR DRIVER (EDU)Click here

7. Click here

   REPLACE INTEGRATION RELAY

8. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

9. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

11. Click here

    REPLACE ECMClick here