ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1418 SECONDARY AIR INJECTION SYSTEM CONTROL “A” CIRCUIT SHORTED

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

DTC P1418 SECONDARY AIR INJECTION SYSTEM CONTROL “A” CIRCUIT SHORTED

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

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

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR PUMP RELAY. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from the ECM and secondary air pump relay. 3) Measure the resistance of the harness between the ECM and secondary air pump relay. Connector & terminal (B135) No. 5 — (F9) No. 6:	Is the resistance less than 1 Ω?		Repair open circuit of the harness between the ECM and secondary air pump relay connector.
2.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR PUMP RELAY. Measure the voltage between ECM and chassis ground. Connector & terminal (B135) No. 5 — Chassis ground (−):	Is the voltage 10 V or more?	Repair power supply short circuit of the harness between the ECM and secondary air pump relay connector.	Temporary poor contact occurs. Check the poor contact of connector.