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

DTC P0414 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE “A” CIRCUIT SHORTED

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

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

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from the ECM. 3) Remove the secondary air pump relay from the relay box. 4) Measure the resistance of the harness between ECM and secondary air combination valve relay terminal. Connector & terminal (B136) No. 30 — (F27) No. 14:	Is the resistance less than 1 Ω?		Repair open circuit of the harness between ECM and secondary air combination valve relay terminal.
2.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY. Measure the voltage between ECM and chassis ground. Connector & terminal (B136) No. 30 (+) — Chassis ground (−):	Is the voltage 10 V or more?	Repair the short to power supply in the harness between ECM and secondary air combination valve relay terminal.	Temporary poor contact occurs. Check the poor contact of connector.