Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Subaru Forester X, AutomaticFACTORY OEM SERVICE PROCEDURE
DTC P0607: Control Module Performance
DTC DETECTING CONDITION:
- Immediately at fault recognition
- GENERAL DESCRIPTION < Ref. to DTC P0605 INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM) ERROR , Diagnostic Trouble Code (DTC) Detecting Criteria. > and < Ref. to DTC P0607 CONTROL MODULE PERFORMANCE , Diagnostic Trouble Code (DTC) Detecting Criteria. >
TROUBLE SYMPTOM:
- Erroneous idling
- Poor driving performance
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to
, OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to
, PROCEDURE , Inspection Mode. >.
WIRING DIAGRAM:
DIAGNOSTIC PROCEDURE DTC P0607
| Step | Check | Yes | No |
|---|---|---|---|
1 CHECK INPUT VOLTAGE OF ECM
Connector & terminal (B135) No. 5 (+) - Chassis ground (-): (B135) No. 6 (+) - Chassis ground (-): |
Is the measured value 10 - 13 V? | Go to step 2 . | Repair the open circuit or ground short of power supply circuit. |
2 CHECK INPUT VOLTAGE OF ECM
Connector & terminal (B135) No. 5 (+) - Chassis ground (-): (B135) No. 6 (+) - Chassis ground (-): |
Is the measured value 13 - 15 V? | Go to step 3 . | Repair the open circuit or ground short of power supply circuit. |
| 3 CHECK GROUND HARNESS OF ECM Measure the voltage between ECM connector and ground. Connector & terminal (B137) No. 7 (+) - Chassis ground (-): |
Is the measured value less than 1 V? | Repair poor contact of ECM connector. If poor contact occur, replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . > | Retighten the engine ground terminal. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.