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Dan
Dan, ASE Certified Technician
Category: Australia Car
Satisfied Customers: 1694
Experience:  Auto Technician
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Just replaced the head gaskets on an 06 2.5 forester non

Customer Question

just replaced the head gaskets on an 06 2.5 forester non turbo and on start up now have ode p2021 and cant clear it. we didnt remove the manifold when replacing the gaskets, have checked that the tgvs are not seized but not sure now how to reset up vaves etc, not even sure which part is faulty. any assistance would be appreciated
JA: Does the engine turn over? How old is the battery?
Customer: yip, starts, runs and drives fine
JA: What is the model/year of your Subaru?
Customer: 06, sg9 2.5 non turbo
JA: What year is your Subaru?
Customer: 2006
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yip, removed valves and sensors from both shafts which are free to rotate from both banks, obviously not seized but need to know how to reassemble correctly and reset i guess
JA: Anything else you think the mechanic should know?
Customer: the valve motors work and rotate both shafts, bit of a mystory as we didnt even unplug them when replacing the head gaskets. until we struck the problem that wasnt there as far as i am awhare initially
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Subaru Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Australia Car
Expert:  Dan replied 1 year ago.

DTC P2021 INTAKE MANIFOLD RUNNER POSITION SENSOR / SWITCH CIRCUIT LOW (BANK 2)

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION

TROUBLE SYMPTOM:

• Improper idling

• Engine stalls.

• Poor driving performance

CAUTION:

After repairing or replacing the defective part, carry out the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK CURRENT DATA.

1) Start the engine.

2) Read the data of tumble generator valve position sensor signal using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.

• General scan tool

For detailed operation procedure, refer to the general scan tool operation manual.

Is the voltage less than 0.1 V?

Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector may be the cause.

NOTE:

In this case, repair the following item:

• Poor contact of tumble generator valve position sensor connector

• Poor contact in ECM connector

• Poor contact of coupling connector

2.CHECK INPUT SIGNAL OF ECM.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B134) No. 19 (+) — Chassis ground (−):

Is the voltage more than 4.5 V?

3.CHECK INPUT SIGNAL OF ECM.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B134) No. 19 (+) — Chassis ground (−):

Does the voltage change when shaking the harness and connector of the ECM while monitoring the value with a voltage meter?

Repair poor contact in ECM connector.

Contact with SOA Service Center.

NOTE:

The deterioration of multiple parts can be thought as the cause.

4.CHECK INPUT SIGNAL OF ECM.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B134) No. 16 (+) — Chassis ground (−):

Is the voltage less than 0.1 V?

5.CHECK INPUT SIGNAL FOR ECM (USING SUBARU SELECT MONITOR).

Measure the voltage between ECM connector and chassis ground.

Does the voltage change by shaking the harness and connector of ECM while monitoring the value with Subaru Select Monitor?

Repair poor contact in ECM connector.

6.CHECK HARNESS BETWEEN ECM AND TUMBLE GENERATOR VALVE POSITION SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from tumble generator valve position sensor.

3) Turn the ignition switch to ON.

4) Measure the voltage between the tumble generator valve position sensor connector and engine ground.

Connector & terminal

(E50) No. 1 (+) — Engine ground (−):

Is the voltage more than 4.5 V?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between tumble generator valve position sensor and ECM connector

• Poor contact of tumble generator valve position sensor connector

• Poor contact in ECM connector

• Poor contact of coupling connector

• Poor contact of joint connector

7.CHECK HARNESS BETWEEN ECM AND TUMBLE GENERATOR VALVE POSITION SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance of harness between ECM connector and tumble generator valve position sensor connector.

Connector & terminal

(B134) No. 16 — (E50) No. 3:

Is the resistance less than 1 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between tumble generator valve position sensor and ECM connector

• Poor contact in ECM connector

• Poor contact of tumble generator valve position sensor connector

• Poor contact of coupling connector

8.CHECK HARNESS BETWEEN ECM AND TUMBLE GENERATOR VALVE POSITION SENSOR CONNECTOR.

Measure the resistance of the harness between the tumble generator valve position sensor connector and engine ground.

Connector & terminal

(E50) No. 3 — Engine ground:

Is the resistance more than 1 MΩ?

Repair the ground short circuit of the harness between the tumble generator valve position sensor and ECM connector.

9.CHECK POOR CONTACT.

Check for poor contact in the tumble generator valve position sensor connector.

Is there poor contact in the tumble generator valve position sensor connector?

Repair poor contact of the tumble generator valve position sensor connector.

Replace the tumble generator valve position sensor.

Expert:  Dan replied 1 year ago.

If you need more help, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service. You can rate at any time and we can continue to work on your question, this does not close out your question. Remember, in some cases it can be difficult to completely diagnose or help repair your vehicle without being there, but I try to give you the best possible answer with the information that I have.

Thanks Dan

Expert:  Dan replied 1 year ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated. We have 7 days to get a post rated before it times out. When a post times out, that means its no longer on my active list (if you reply I never know it.) You have already paid the fees to get this question answered, but it appears you’re not pleased, or need more help.

Let me help some more. Is there anything else you feel I could offer so you would be pleased with my help.

Thanks Dan