ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0046 WASTEGATE VALVE CIRCUIT (LOW)

ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0046 WASTEGATE VALVE CIRCUIT (LOW)

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Poor acceleration

• Surging

• Black smoke emitted

• Engine noise

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK POOR CONTACT. Check for poor contact of the ECM connector and the boost control valve connector.	Is there poor contact of ECM connector or boost control valve connector?	Repair poor contact of ECM connector or boost control valve connector.
2.CHECK BOOST CONTROL VALVE POWER SUPPLY. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from boost control valve. 3) Turn the ignition switch to ON. 4) Measure the voltage between boost control valve connector and engine ground. Connector & terminal (E64) No. 1 (+) — Engine ground (−):	Is the voltage 10 V or more?		Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit of harness between main relay connector and boost control valve connector • Poor contact of coupling connector
3.CHECK HARNESS BETWEEN ECM AND BOOST CONTROL VALVE CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from ECM. 3) Measure the resistance of harness between ECM connector and boost control valve connector. Connector & terminal (B134) No. 1 — (E64) No. 2:	Is the resistance less than 1 Ω?		Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit of harness between ECM connector and boost control valve connector • Poor contact of coupling connector
4.CHECK HARNESS BETWEEN ECM AND BOOST CONTROL VALVE CONNECTOR. Measure the resistance between boost control valve connector and engine ground. Connector & terminal (E64) No. 2 — Engine ground:	Is the resistance 1 MΩ or more?	Replace the boost control valve.	Repair ground short circuit of harness between ECM connector and boost control valve connector.