Inspection Procedure 18: Variable Geometry Control Motor System








OPERATION



  • Power is supplied to the variable geometry control motor (terminal No. 2) from the engine-ECU (terminal No. 133).
  • The engine-ECU (terminal No. 132) makes the power transistor in the unit be in "ON" position, and that makes currents go on the variable geometry control motor (terminal No. 1).

FUNCTION



  • In response to a signal from the engine-ECU, the variable geometry control motor controls the boost pressure.

PROBABLE CAUSES



  • Failed variable geometry control motor
  • Open/short circuit or harness damage in variable geometry control motor circuit or loose connector contact
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-116 variable geometry control motor connector

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

STEP 2. Connector check: B-16 engine-ECU connector

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

STEP 3. Check harness between B-116 (terminal No. 2) variable geometry control motor connector and B-16 (terminal No. 133) engine-ECU connector.

  • Check power supply line 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-116 (terminal No. 1) variable geometry control motor connector and B-16 (terminal No. 132) 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. Replace the variable geometry control motor.



  • After replacing the variable geometry control motor, re-check the trouble symptoms.

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