Code No. P0047: Variable Geometry Control Solenoid Valve Circuit Low Input
OPERATION
- Power is supplied to the variable geometry control solenoid valve connector terminal from the engine control relay connector terminal.
- The engine-ECU connector terminal VGT makes the power transistor in the unit be in "ON" position, and that makes currents go on the variable geometry control solenoid valve connector terminal.
FUNCTION
- The variable geometry control solenoid valve controls the vacuum pressure introduced into the variable geometry actuator, using the signal from the engine-ECU. This allows the boost pressure to be adequate for the driving conditions.
TROUBLE JUDGEMENT
Check Conditions
- Battery positive voltage is 8 - 16 V.
- 2 seconds later after the engine has started up.
Judgement Criterion
- Variable geometry control solenoid valve output voltage is 0.4 V or less (driving current is abnormally low).
FAIL-SAFE AND BACKUP FUNCTION
- The fuel injection amount is restricted (output restriction).
- The open angle of the accelerator pedal is restricted.
- The throttle valve is opened (electrical discontinuity).
- The EGR control is stopped (fully closed).
- The DPF regeneration is prohibited.
- The turbocharger control is prohibited.
PROBABLE CAUSES
- Failed variable geometry control solenoid valve
- Open/short circuit or harness damage in variable geometry control solenoid valve circuit or loose connector contact
- Failed engine-ECU
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STEP 1. M.U.T.-III actuator test
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- Item 36: Variable geometry control solenoid valve
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OK: The variable geometry actuator is operated
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Q.
Is the check result normal?
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 Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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 Go to Step 2.
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STEP 2. Check variable geometry control solenoid valve itself.
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- Check variable geometry control solenoid valve (Refer to GROUP 15 - On-Vehicle Service - Variable Geometry Solenoid Valve Check
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the variable geometry control solenoid valve.
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STEP 3. Voltage measurement at variable geometry control solenoid valve connector (power supply line).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(3)Check the voltage between the variable geometry control solenoid valve connector (power supply line)and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Repair power supply line between variable geometry control solenoid valve connector and engine control relay connector.
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STEP 4. Voltage measurement at engine-ECU connector (VGT terminal).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(3)Check the voltage between the engine-ECU connector (VGT terminal) and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Repair VGT line between variable geometry control solenoid valve connector and engine-ECU connector.
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STEP 5. Check of damage in VGT line between variable geometry control solenoid valve connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness.
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STEP 6. Check of damage in power supply line between engine control relay connector and variable geometry control solenoid valve connector.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the connector(s) or wiring harness.
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STEP 7. M.U.T.-III actuator test
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- Item 36: Variable geometry control solenoid valve
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OK: The variable geometry actuator is operated
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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Replace the engine-ECU.
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