Code No. P265B: Abnormal Hall Sensor Implanted Into Valve Lift Control Motor

Operation

A power voltage of 5 V is applied to the valve lift control motor connector terminal from the valve lift ECU connector terminal HS5V.
The power voltage is earthed to the valve lift ECU connector terminal HSE from the valve lift control motor connector terminal.
The sensor signal is inputted to the valve lift ECU connector terminal HSWS, HSVS and HSUS from the valve lift control motor-integrated Hall sensor output terminal.

FUNCTION

The valve lift ECU uses the valve lift control motor-integrated Hall sensor signal to detect motor rotation angle.

TROUBLE JUDGMENT

Check Condition

Engine starting sequence was completed.
The valve lift ECU has determined that the system communicates with the engine-ECU via VLC-CAN normally.

Judgement Criterion

The engine-ECU has received malfunction from the valve lift ECU via VLC-CAN.
Contents of malfunction which the valve lift ECU detects

The system has detected an abnormal output pattern (all High or Low) in the U, V and W-phase position sensor signals.

FAIL-SAFE AND BACKUP FUNCTION

Deenergises the valve lift control motor.

PROBABLE CAUSES

Open/short circuit or harness damage in valve lift control motor-integrated Hall sensor circuit or loose connector contact
Failed valve lift control motor (hall sensor)
Failed valve lift ECU

DIAGNOSIS PROCEDURE

STEP 1. Perform voltage measurement at valve lift control motor connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal valve lift ECU HS5V line and body earth.

OK: 4.9 - 5.1 V

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 2.

STEP 2. Check harness between valve lift control motor connector terminal and valve lift ECU connector terminal HS5V.

Check power supply line for open/short circuit.

Q. Is the check result normal?

	Go to Step 3.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 3. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	Replace the valve lift ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 4. Check harness between valve lift control motor connector terminal and valve lift ECU connector terminal HS5V.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 5.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 5. Perform resistance measurement at valve lift control motor connector.

Disconnect connector, and measure at harness side.
Resistance between terminal valve lift ECU HSE line and body earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 7.

	Go to Step 6.

STEP 6. Check harness between valve lift control motor connector terminal and valve lift ECU connector terminal HSE.

Check earthing line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 3.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 7. Check harness between valve lift control motor connector terminal and valve lift ECU connector terminal HSUS.

Check signal line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 8.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 8. Check harness between valve lift control motor connector terminal and valve lift ECU connector terminal HSVS.

Check signal line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 9.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 9. Check harness between valve lift control motor connector terminal and valve lift ECU connector terminal HSWS.

Check signal line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 10.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 10. Check harness between valve lift control motor connector terminal and body earth.

Check the shield line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 11.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 11. Replace the valve lift control motor.

After replacing the valve lift control motor, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?

	Go to Step 12.

	Check end.

STEP 12. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	Replace the valve lift ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).