Do you have to replace the timing chain at some point??? - Scion xB Forum
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#1 Old 11-14-2011, 02:05 PM
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Do you have to replace the timing chain at some point???

When I bought my XB a few months ago, It had just over 90k on it. The guy had just done all of the service work that the book calls for and I asked him if the timing belt was replaced. He said that the XB had a chain and that it does not need to be replaced like the little honda cars. Is this a true statement or do I need to have this done? I've also been getting the three stooge lights that people talk about coming off and on. Just a few days ago the maint req'd light came on and has stayed on. I went to autozone and they read a P0012 code. At this point I'm not sure which direction to head and I was hoping to find some helpful advice from fellow members. Thanks.
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#2 Old 11-14-2011, 02:21 PM
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Re: Do you have to replace the timing chain at some point???

If you are doing engine rebuild then sure- replace the chain. But it doesn't have a scheduled replacement interval. But it can brake, jump a tooth (rare), wear out the plastic lined tensioner and get noisy.

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#3 Old 11-14-2011, 04:40 PM
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Re: Do you have to replace the timing chain at some point???

Do a search on the P0012 trouble code. It's a bad one, and pretty common to see in our cars.

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#4 Old 11-14-2011, 10:25 PM
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Re: Do you have to replace the timing chain at some point???

P0012 - "A" Camshaft Position - Timing Over-Retarded (Bank 1)

OBD-II DTC Trouble Code Description

"A" Camshaft Position - Timing Over-Retarded (Bank 1)

What does that mean?

A code P0012 refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0012 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set. The "A" camshaft is either the intake, left, or front camshaft.

Potential Symptoms

Most likely a P0012 DTC will result in one of the following:

hard starting
poor idle and/or
stalling
There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

Causes

A P0012 DTC trouble code may be caused by one or more of the following:

Incorrect camshaft timing
Wiring problems (harness/wiring) in intake timing control valve control solenoid system
Continuous oil flow to VCT piston chamber
Failed timing valve control solenoid (stuck open)
Possible Solutions

The main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.

http://www.autopartswarehouse.com/de...Q180-0278.html
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#5 Old 11-15-2011, 01:42 PM
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Re: Do you have to replace the timing chain at some point???

Thanks for the information about the error code. I have ordered a new solenoid and will replace it this weekend. Seems like a logical place to start. The box shows no symptoms at all other than the light.

---------- Post added 11-16-2011 at 06:49 AM ----------

Could any of you guys give me a rough idea were the sensor is located on the engine? I've got to go pick up the part this afternoon and im just trying to plan ahead. THanks.
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