Code Questions

doobismaximus

Member

Jul 18, 2014

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Anywhere usa

Nov 5, 2014

#1

• Nov 5, 2014

• #1

Im getting code 564. Which is fan control circuits failure. The fan runs as i start the test, i assume it works as needed. Dont have any fuses that are blown. Could it be the connection from harness to fan?
Also getting 176,172. Which are lean o2 sensor codes. I replaced both sensors a little over a year ago. Does any one have an idea why its running lean? Need ass-sistance

 

toyman

10 Year Member

Jul 19, 2007

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Vernon BC

Nov 5, 2014

#2

• Nov 5, 2014

• #2

Look for any breaks in the vacuum system and air being drawn into the exhaust system before the O2 sensors. Check the fan operation at the fan motor pigtail by supplying power directly from the battery positive terminal. There are three pins, high and low fan and a ground. If that checks okay it's likely the fan control circuit in the CCRM is the source of the code.

 

doobismaximus

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Jul 18, 2014

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Anywhere usa

Nov 12, 2014

#3

• Nov 12, 2014

• #3

Is this important?

 

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toyman

10 Year Member

Jul 19, 2007

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Vernon BC

Nov 12, 2014

#4

• Nov 12, 2014

• #4

Might be. Where does it go at the other end of the tubing? Looks like it's been capped off.

 

doobismaximus

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Jul 18, 2014

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Nov 12, 2014

#5

• Nov 12, 2014

• #5

It goes through the firewall from the engine bay. Where it originates, i havent the foggiest. Cant tell if its been shortened. Im gonna check the window washer fluid tomorrow. As thin as it is, it cant be doing much. Will do some more investigation tomorrow.

 

toyman

10 Year Member

Jul 19, 2007

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Vernon BC

Nov 13, 2014

#6

• Nov 13, 2014

• #6

The other end is probably connected to the HVAC control. Do you get hot and/or cold air from the vents?

 

doobismaximus

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Jul 18, 2014

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Nov 13, 2014

#7

• Nov 13, 2014

• #7

Heat works good. Ac is working also. Im getting my truck out of the shop tomorrow. So i can do some real investigation then. For now it will have to wait. Thanks for your input tho bro

 

Chythar

Recently finished repairing my rear

20+ Year Stangneter

Aug 26, 2004

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Foothill Ranch, CA

Nov 14, 2014

#8

• Nov 14, 2014

• #8

That line is probably the one that provides vacuum to the HVAC controls behind the dash. Do you only get air through the defroster vents? That line should lead across the firewall to the vacuum tree on the driver's fender, right next tothe brake booster. It's the small connector, third from the top.