Inspection Procedure 19: Variable Geometry Position Sensor System



OPERATION
- A power voltage of 5 V is applied to the variable geometry
position sensor (terminal No. 5) from the engine-ECU (terminal No. 109).
- The power voltage is earthed to the engine-ECU (terminal No. 127) from the variable
geometry position sensor (terminal No. 3).
- The sensor signal is inputted to the engine-ECU (terminal No. 117) from the variable
geometry position sensor output terminal (terminal No. 4).
FUNCTION
- The variable geometry position sensor detects the position
of variable geometry actuator rod and sends the signal to the engine-ECU.
- Based on the signal, the engine-ECU performs the feedback control of the variable
geometry actuator rod.
PROBABLE CAUSES
- Failed variable geometry position sensor
- Open/short circuit or harness damage in variable geometry position sensor circuit
or loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Connector check: B-116 variable geometry position sensor connector |
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 2. Perform voltage measurement at B-116 variable geometry position sensor connector. |
|
OK: 4.9 -
5.1 V |
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 3. Connector check: B-16 engine-ECU connector |
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 4. Check harness between B-116 (terminal No. 5) variable geometry position sensor connector and B-16 (terminal No. 109) engine-ECU. |
|
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 5. Check the trouble symptoms. |
Q.
Does trouble symptom persist?
|
![]() |
|
![]() ![]() |
|
STEP 6. Connector check: B-16 engine-ECU connector |
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 7. Check harness between B-116 (terminal No. 5) variable geometry position sensor connector and B-16 (terminal No. 109) engine-ECU connector. |
|
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 8. Perform resistance measurement at B-116 variable geometry position sensor connector. |
|
OK: Continuity (2 Ω
or less) |
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 9. Connector check: B-16 engine-ECU connector |
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 10. Check harness between B-116 (terminal No. 3) variable geometry position sensor connector and B-16 (terminal No. 127) engine-ECU connector. |
|
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 11. Check harness between B-116 (terminal No. 4) variable geometry position sensor connector and B-16 (terminal No. 117) engine-ECU connector. |
|
Q.
Is the check result normal?
|
![]() |
|
![]() |
|
STEP 12. Replace the turbocharger assembly. |
|
Q.
Does trouble symptom persist?
|
![]() |
|
![]() |
|