DTC P0606: Control Module Processor: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Poor driving performance

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

• IMPREZA MODEL

  Courtesy of SUBARU OF AMERICA, INC.

• CROSSTREK MODEL

  Courtesy of SUBARU OF AMERICA, INC.

  CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
  NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

1. Turn the ignition switch to ON.
2. Measure the voltage between ECM connector and chassis ground.

   Connector and terminal 

   (B134) No. 67 (+) - Chassis ground (-):

   (B134) No. 68 (+) - Chassis ground (-):

Is the voltage 10 - 13 V?

Yes:  Go to  2.

No:  Repair the open or short to ground in the power supply circuit.

1. Start the engine.
2. Measure the voltage between ECM connector and chassis ground.

   Connector and terminal 

   (B134) No. 67 (+) - Chassis ground (-):

   (B134) No. 68 (+) - Chassis ground (-):

Is the voltage 13 - 15 V?

Yes:  Go to  3.

No:  Repair the open or short to ground in the power supply circuit.

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connectors from electronic throttle control.
4. Measure the resistance of harness between ECM connector and electronic throttle control connector.

   Connector and terminal 

   (E158) No. 27 - (E57) No. 5:

   (E158) No. 30 - (E57) No. 3:

Is the resistance less than 1 Ω?

Yes:  Go to  4.

No:  Repair the open circuit of harness between ECM connector and electronic throttle control connector.

1. Connect all connectors.
2. Turn the ignition switch to ON.
3. Measure the voltage between ECM connector and chassis ground.

   Connector and terminal 

   (B134) No. 69 (+) - Chassis ground (-):

   (B134) No. 70 (+) - Chassis ground (-):

   (B134) No. 71 (+) - Chassis ground (-):

   (B134) No. 72 (+) - Chassis ground (-):

Is the voltage less than 1 V?

Yes:  Check the connector for poor contact and check the harness. Replace the ECM if no fault is found. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

No:  Repair the harness and connector.