Sfi System Ecm Power Source Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT INTEGRATION RELAY (INTEGRATION RELAY - BODY GROUND)

INSPECT INTEGRATION RELAY (EFI AND IG2 RELAY)

CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT ECM (IGSW VOLTAGE)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM, INTEGRATION RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE ROOM RELAY BLOCK)

CHECK ENTRY AND START SYSTEM (POWER SOURCE MODE DOES NOT CHANGE)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1. Remove the integration relay from the engine room relay block.
   

2. 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

1. Remove the integration relay from the engine room relay block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1C-1 - 1B-4	Battery voltage is not applied to terminals 1B-2 and 1B-3	10 kΩ or higher
   	Battery voltage is applied to terminals 1B-2 and 1B-3	Below 1 Ω
   1C-1 - 1B-8	Battery voltage is not applied to terminals 1B-7 and 1B-6	10 kΩ or higher
   	Battery voltage is applied to terminals 1B-7 and 1B-6	Below 1 Ω

1. Check the harness and the connectors between the integration relay and the ECM.
   

   1. Remove the integration relay from the engine room 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
      A38-34 (MREL) - 1B-2	Always	Below 1 Ω
      A38-3 (+B) - 1B-4	Always	Below 1 Ω
      A38-2 (+B2) - 1B-4	Always	Below 1 Ω
      A38-34 (MREL) or 1B-2 - Body ground	Always	10 kΩ or higher
      A38-3 (+B) or 1B-4 - Body ground	Always	10 kΩ or higher
      A38-2 (+B2) or 1B-4 - Body ground	Always	10 kΩ or higher

2. Check the harness and connectors between the integration relay and body ground.
   

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      1B-3 - Body ground	Always	Below 1 Ω

1. Disconnect the ECM connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   C45-81 (E1) - Body ground	Always	Below 1 Ω

1. Disconnect the ECM connectors.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A38-28 (IGSW) - C45-81 (E1)	Engine switch on (IG)	11 to 14 V

1. Remove the integration relay from the engine room 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
   1B-8 - A38-28 (IGSW)	Always	Below 1 Ω
   1B-8 or A38-28 (IGSW) - Body ground	Always	10 kΩ or higher

1. Remove the integration relay from the engine room relay block.
   

2. Disconnect the E2 main body ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E2-11 (IG2D) - 1B-6	Always	Below 1 Ω
   E2-11 (IG2D) or 1B-6 - Body ground	Always	10 kΩ or higher

1. Check the entry and start system (Click here).