DTC P0607 Control Module Performance

WARNING: This page is about a different car, the 2006 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION <Ref. to DTC P0607 CONTROL MODULE PERFORMANCE , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Improper idling
Poor driving performance

CAUTION: After repairing or replacing the defective part, carry out the Clear Memory Mode <Ref. to . OPERATION , CLEAR MEMORY MODE. > and Inspection Mode <Ref. to PROCEDURE , INSPECTION MODE. >

WIRING DIAGRAM:

Fig 1: Identifying Control Module Performance - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

TROUBLESHOOTING CHART

Step	Check	Yes	No
1 CHECK INPUT VOLTAGE FROM ECM. Turn the ignition switch to ON. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 7 (+) - Chassis ground (-): (B135) No. 2 (+) - Chassis ground (-):	Is the voltage 10 - 13 V?	Go to step 2.	Repair the open or ground short circuit of power supply circuit.
2 CHECK INPUT VOLTAGE FROM ECM. Start the engine. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 7 (+) - Chassis ground (-): (B135) No. 2 (+) - Chassis ground (-):	Is the voltage 13 - 15 V?	Go to step 3.	Repair the open or ground short circuit of power supply circuit.
3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from the ECM and electronic throttle control. Measure resistance of the harness between the ECM and electronic throttle control harness. Connector & terminal (E57) No. 5 - (B134) No. 19: (E57) No. 3 - (B134) No. 29:	Is the resistance less than 1 Ω?	Go to step 4.	Repair open circuit of the harness between the ECM and electronic throttle control connector.
4 CHECK ECM GROUND HARNESS. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 5 (+) - Chassis ground (-): (B137) No. 7 (+) - Chassis ground (-): (B137) No. 1 (+) - Chassis ground (-): (B137) No. 2 (+) - Chassis ground (-): (B137) No. 3 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Repair poor contact in ECM connector. Replace the ECM if defective. <Ref. to ENGINE CONTROL MODULE (ECM) . >	Further tighten the engine ground terminal.