DTC P2257: Secondary Air System Control "A" Circuit LOW: Notes
DTC detecting condition:
Immediately at fault recognition
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode Refer to ENGINE (DIAGNOSTICS) (STI)>CLEAR MEMORY MODE>OPERATION
, and inspection mode Refer to ENGINE (DIAGNOSTICS) (STI)>INSPECTION MODE>PROCEDURE
.
Wiring diagram:
Engine Electrical System Refer to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .
- CHECK HARNESS BETWEEN ECM AND SECONDARY AIR PUMP RELAY CONNECTOR.
- Turn the ignition switch to OFF.
- Disconnect the connector from ECM.
- Remove the secondary air pump relay.
- Measure the resistance of harness between ECM connector and secondary air pump relay connector.
Connector & terminal
(B135) No. 27 - (F9) No. 13:
Is the resistance less than 1 Ω?
Yes: Go to 2.
No: Repair the harness and connector.
NOTE: In this case, repair the following item:- Open circuit in harness between ECM connector and secondary air pump relay connector
- Poor contact of coupling connector
- CHECK HARNESS BETWEEN ECM AND SECONDARY AIR PUMP RELAY CONNECTOR.
Measure the resistance between ECM connector and chassis ground.
Connector & terminal
(B135) No. 27 - Chassis ground:
Is the resistance 1 MΩ or more?
Yes: Even if DTC is detected, 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 poor contact of connector, temporary open or short circuit of harness may be the cause.No: Repair the short circuit to ground in harness between ECM connector and secondary air pump relay connector.