ENGINE (DIAGNOSTICS)(H4SO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0028 INTAKE VALVE CONTROL SOLENOID CIRCUIT RANGE/PERFORMANCE (BANK 2)

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Improper idling

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN ECM AND VARIABLE VALVE LIFT DIAGNOSIS OIL PRESSURE SWITCH LH.

1) Warm up the engine.

2) Turn the ignition switch to OFF.

3) Disconnect the connectors from the ECM and variable valve lift diagnosis oil pressure switch LH.

4) Measure the resistance of harness between ECM and variable valve lift diagnosis oil pressure switch LH connector.

Connector & terminal

(B134) No. 32 — (E72) No. 1:

Is the resistance less than 1 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM and variable valve lift diagnosis oil pressure switch LH connector

• Poor contact of coupling connector

2.CHECK HARNESS BETWEEN ECM AND VARIABLE VALVE LIFT DIAGNOSIS OIL PRESSURE SWITCH LH.

Measure the resistance between the variable valve lift diagnosis oil pressure switch LH connector and engine ground.

Connector & terminal

(E72) No. 1 — Engine ground:

Is the resistance 1 MΩ or more?

Repair the ground short circuit in harness between ECM and variable valve lift diagnosis oil pressure switch LH connector.

3.CHECK HARNESS BETWEEN ECM AND VARIABLE VALVE LIFT DIAGNOSIS OIL PRESSURE SWITCH LH.

1) Turn the ignition switch to ON.

2) Measure the voltage between the variable valve lift diagnosis oil pressure switch LH connector and engine ground.

Connector & terminal

(E72) No. 1 (+) — Engine ground (−):

Is the voltage 10 V or more?

Repair the short circuit to power supply in harness between ECM and variable valve lift diagnosis oil pressure switch LH connector.

4.CHECK DTC.

1) Perform the Clear Memory Mode.

2) After idling the engine, check the DTC.

NOTE:

For detailed procedure, refer to “Clear Memory Mode”.

Is DTC displayed?

Replace the oil switching solenoid valve LH.

END.

5.CHECK DTC.

1) Perform the Clear Memory Mode.

2) After idling the engine, check the DTC.

NOTE:

For detailed procedure, refer to “Clear Memory Mode”.

Is DTC displayed?

Check for oil routing.

END.