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Old 03-03-2009, 09:29 AM   #1
hd071502
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Default How to know if throttle body is bad?

I have been having code p2176 reappear after I reset the code. I don't know what else to look for. How do I know my throttle body might be bad? I put dielectric in all the connections, no visable obstructions in the throttle body. I found this in another post.

DTC P2176
Circuit Description
The engine control module (ECM) controls the throttle blades by applying a varying voltage to the throttle valve motor. The ECM monitors the actual throttle blade position using throttle position (TP) sensor 1 and 2. If the ECM cannot detect the minimum throttle position, DTC P2176 sets.

Conditions for Running the DTC
The vehicle speed is 0 km/h (0 mph).

The engine speed is less than 40 RPM.

The engine coolant temperature (ECT) is between 5-100C (41-212F).

The intake air temperature (IAT) is less than 5C (41F).

The battery voltage is more than 10 volts.

The accelerator pedal position (APP) is less than 15 percent.

Conditions for Setting the DTC
The control module can not determine the minimum throttle position.

Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

Clear the MIL and the DTC with a scan tool.



Diagnostic Aids
Inspect for a condition in which the throttle valves may be held open.

Inspect for conditions in which ice may have formed in the throttle bore.
Thanks for all your help!

...
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2008 H-D Street Glide 1584cc 1WD!

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Old 03-03-2009, 04:12 PM   #2
1saxman
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Default Re: How to know if throttle body is bad?

Take the intake air hose off and look at it to see if it's black inside or so carboned-up that the throttle bldes are sticking. It would then need cleaning.

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Old 03-03-2009, 05:23 PM   #3
hd071502
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Default Re: How to know if throttle body is bad?

That was the first thing I did. I actually went as far as to take the motor off the side and clean the contacts with alcohol and then reassembled, but same errors. I'm just thinking there must be a way to get a voltage reading at the throttle position sensor to make sure that is reading correct. (if that's possible)

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Old 03-03-2009, 06:53 PM   #4
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Default Re: How to know if throttle body is bad?

Quote:
Originally Posted by hd071502 View Post
I'm just thinking there must be a way to get a voltage reading at the throttle position sensor to make sure that is reading correct. (if that's possible)
There is a troubleshooting tree in the FSM with voltage values - the file is too large to post but I'll email if you PM address.

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Old 03-03-2009, 10:25 PM   #5
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Default Re: How to know if throttle body is bad?

you have PM

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Old 03-03-2009, 10:31 PM   #6
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Default Re: How to know if throttle body is bad?

I just sent ... check your email.

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Old 03-06-2009, 08:38 PM   #7
SaturnTech122
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Default Re: How to know if throttle body is bad?

the throttle body for your vehicle is on national backorder... go figure, its either corrosion at conector c201(under trim panel in car next to hood release) if you pull the connector apart you wll see green on the terminals, and or it need a throttle body connector and 6 new terminals there, i just repaired one last week, sometimes it ends up needing a throttle body, sometimes not

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Old 03-08-2009, 11:13 AM   #8
hd071502
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Default Re: How to know if throttle body is bad?

Quote:
Originally Posted by SaturnTech122 View Post
, and or it need a throttle body connector and 6 new terminals there, i just repaired one last week, sometimes it ends up needing a throttle body, sometimes not
Is the throttle body connector and 6 terminals something you get through Saturn? I have already checked the large 40 pin connector under the kickpanel, that seems OK.

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Old 03-09-2009, 06:28 PM   #9
SaturnTech122
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Default Re: How to know if throttle body is bad?

yeah youd have to get em from a dealer, the terminals arent cheap, 220 ish i think plus 30 for the connector, the throttle body is around 600, but its on backorder, id replace the teminals and connector clear codes and see if it fixes it, sometimes thats all they need.

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Old 03-11-2009, 07:58 PM   #10
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Default Re: How to know if throttle body is bad?

To give an update, I took apart the big connector behind the kick panel, seemed OK, no corrosion, added some dielctric, then took apart my throttle body connector...the snap was broken!!! So I used some ZIP ties (I know a bit redneck!) to pull it tighter to the trottle body, and so far no codes. That work was done last Saturday, been driving it daily. Hope this is a good fix until I can get a replacement snap piece.

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2006 GTO 6.0 RWD
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Old 03-11-2009, 08:45 PM   #11
SaturnTech122
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Thumbs Up Re: How to know if throttle body is bad?

sounds like you may have it, poor connection would definetley give you those symptoms

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Old 03-12-2009, 10:14 AM   #12
1saxman
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Default Re: How to know if throttle body is bad?

Quote:
Originally Posted by hd071502 View Post
To give an update, I took apart the big connector behind the kick panel, seemed OK, no corrosion, added some dielctric, then took apart my throttle body connector...the snap was broken!!! So I used some ZIP ties (I know a bit redneck!) to pull it tighter to the trottle body, and so far no codes. That work was done last Saturday, been driving it daily. Hope this is a good fix until I can get a replacement snap piece.
Way to go, man! Git 'r done!

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