DTC P0066 - Air Assisted Injector Control Circuit Or Circuit Low -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
TROUBLE SYMPTOM:
- Erroneous idling
- Engine stalls.
CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >
WIRING DIAGRAM:

Fig 1: Air Assisted Injector Control Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK OUTPUT SIGNAL FROM ECM. Turn ignition switch to ON. Measure voltage between ECM and chassis ground. Connector & terminal (B134) No. 12 (+) - Chassis ground (-):	Is the measured value more than 10 V?	Repair poor contact in ECM connector.	Go to step 2.
2 CHECK POWER SUPPLY TO AIR ASSIST INJECTOR SOLENOID VALVE. Turn ignition switch to OFF. Disconnect connector from air assist injector solenoid valve. Turn ignition switch to ON. Measure voltage between air assist injector solenoid valve and engine ground. Connector & terminal (E42) No. 2 (+) - Engine ground (-):	Is the measured value more than 10 V?	Go to step 3.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between air assist injector solenoid valve and main relay connector Poor contact in coupling connector
3 CHECK HARNESS BETWEEN ECM AND AIR ASSIST INJECTOR SOLENOID VALVE CONNECTOR. Turn ignition switch to OFF. Disconnect connector from ECM. Measure resistance of harness between ECM and air assist injector solenoid valve connector. Connector & terminal (B134) No. 12 - (E42) No. 1:	Is the measured value less than 1 Ω?	Go to step 4.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and air assist injector solenoid valve connector Poor contact in coupling connector
4 CHECK HARNESS BETWEEN ECM AND AIR ASSIST INJECTOR SOLENOID VALVE CONNECTOR. Measure resistance of harness between ECM and chassis ground. Connector & terminal (B134) No. 12 - Chassis ground:	Is the measured value more than 1 MΩ?	Go to step 5.	Repair ground short circuit in harness between ECM and air assist injector solenoid valve connector.
5 CHECK POOR CONTACT. Check poor contact in ECM and air assist injector solenoid valve connectors.	Is there poor contact in ECM and air assist injector solenoid valve connectors?	Repair poor contact in ECM and air assist injector solenoid valve connectors.	Replace air assist injector solenoid valve. < Ref. to AIR ASSIST INJECTOR SOLENOID VALVE . >