Code No. P0048: Variable Geometry Control Solenoid Valve Circuit High Input








OPERATION



  • Power is supplied to the variable geometry control solenoid valve (terminal No. 2) from the engine control relay (terminal No. 1).
  • The engine-ECU (terminal No. 17) makes the power transistor in the unit be in "ON" position, and that makes currents go on the variable geometry control solenoid valve (terminal No. 1).

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 JUDGMENT


Check Conditions
  • Battery positive voltage is 8 - 16 V.
  • 2 seconds later after the engine has started up.
Judgment Criterion
  • Variable geometry control solenoid valve output voltage is 4.5 V or more (driving current is abnormally high).

PROBABLE CAUSES



  • Short circuit in variable geometry control solenoid valve circuit or loose connector contact
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-132 variable geometry control solenoid valve connector, D-213 engine-ECU connector

Q. Are the check results normal?
Go to Step 2 .
Repair or replace the connector.

STEP 2. Check harness between B-132 (terminal No. 1) variable geometry control solenoid valve connector and D-213 (terminal No. 17) engine-ECU connector.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 3 .
Repair the damaged harness wire.

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



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ). After registering the injector identification code, the vehicle equipped with the closed type DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).