Inspection Procedure 13: No. 1 Injector System










OPERATION



  • Power is supplied to the No. 1 injector (terminal No. 2) from the engine-ECU (terminal No. 16 and terminal No. 17).
  • The power voltage is earthed to the engine-ECU (terminal No. 1) from the No. 1 injector (terminal No. 1).

FUNCTION



  • The engine-ECU controls the power supply interval of the No. 1 injector.
  • The fuel injection amount of the No. 1 injector depends on the power supply interval.

PROBABLE CAUSES



  • Failed No. 1 injector
  • Open/short circuit or harness damage in injector circuit or loose connector contact
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-26 glow and injector intermediate connector

Q. Is the check result normal?
Go to Step 2 .
Repair or replace the connector.

STEP 2. Connector check: B-27 engine-ECU connector

Q. Is the check result normal?
Go to Step 3 .
Repair or replace the connector.

STEP 3. Check harness between B-26 (terminal No. 6) glow and injector intermediate connector and B-27 (terminal No. 16 and terminal No. 17) engine-ECU connector.

  • Check power supply for open/short circuit and damage.

Q. Is the check result normal?
Go to Step 4 .
Repair the damaged harness wire.

STEP 4. Check harness between B-26 (terminal No. 10) glow and injector intermediate connector and B-27 (terminal No. 1) engine-ECU connector.

  • Check earthing line for open/short circuit and damage.

Q. Is the check result normal?
Go to Step 5 .
Repair the damaged harness wire.

STEP 5. Connector check: B-26-5 No. 1 injector connector

Q. Is the check result normal?
Go to Step 6 .
Repair or replace the connector.

STEP 6. Check harness between B-26-5 (terminal No. 1) No. 1 injector connector and B-26 (terminal No. 10) glow and injector intermediate connector.

  • Check earthing line for open/short circuit and damage.

Q. Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire.

STEP 7. Check harness between B-26-5 (terminal No. 2) No. 1 injector connector and B-26 (terminal No. 6) glow and injector intermediate connector.

  • Check power supply line for open/short circuit and damage.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 8. Replace the No. 1 injector.



  • After replacing the No. 1 injector, re-check the trouble symptoms.

Q. Does trouble symptom persist?
Replace the engine-ECU.
The check is end.