ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P2433 SECONDARY AIR INJECTION SYSTEM AIR FLOW /PRESSURE SENSOR CIRCUIT HIGH

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

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

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK CURRENT DATA.

1) Turn the ignition switch to ON.

2) Read the data of secondary air piping pressure signal using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.

• General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

Is the measured value 133.3 kPa (1000 mmHg, 39.4 inHg) or more?

Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary open or short circuit of harness or temporary poor contact of connector may be the cause.

2.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE LH CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the secondary air combination valve LH.

3) Turn the ignition switch to ON.

4) Read the data of secondary air piping pressure signal using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.

• General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

Is the measured value 133.3 kPa (1000 mmHg, 39.4 inHg) or more?

Repair the short circuit to power in the harness between ECM and secondary air combination valve LH connectors.

3.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE LH CONNECTOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance of the harness between the secondary air combination valve LH connector and engine ground.

Connector & terminal

(E40) No. 3 — Engine ground:

Is the resistance less than 5 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM and secondary air combination valve LH connector

• Poor contact of ECM connector

4.CHECK FOR POOR CONTACT.

Check for poor contact of the secondary air combination valve LH connector.

Is there poor contact of the secondary air combination valve LH connector?

Repair the poor contact of the secondary air combination valve LH connector.

Replace the secondary air combination valve LH.