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post #1 of 10 Old 01-15-2014, 01:14 PM Thread Starter
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No throttle.

Alrighty...

When driving, very seldom, I will get a CEL, throttle wont respond. This usually happens after hitting a bump. The engine stays running at idle with no missing. A few seconds later, CEL goes away, and the throttle comes back. Everybody's happy again.

Here's the code.
P0221 | Throttle switch B circuit performance | Failed pedal assembly


What should I look at?
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post #2 of 10 Old 01-15-2014, 01:23 PM
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There is a sensor on the pedal where it pivots. Its seldom but they do go bad


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post #3 of 10 Old 01-15-2014, 01:42 PM
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More likely it's not the position sensor (the variable resistor), but the idle switch. Check the connection to it. Shoot it up with some electronics cleaner.

Does it help to take your foot off the pedal and tap it a few times?
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post #4 of 10 Old 01-15-2014, 03:19 PM Thread Starter
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Originally Posted by madpogue View Post
More likely it's not the position sensor (the variable resistor), but the idle switch. Check the connection to it. Shoot it up with some electronics cleaner.



Does it help to take your foot off the pedal and tap it a few times?

Not that I can tell. The CEL stays on while my foot is pressing the pedal.

It got pretty hairy today as I pulled out into traffic and that happened. It got going again but it sure made me pucker.
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post #5 of 10 Old 01-15-2014, 04:28 PM
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Does the CEL go off when you let go of the pedal, then go back on again when you press the pedal?
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post #6 of 10 Old 01-15-2014, 04:37 PM Thread Starter
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Originally Posted by madpogue View Post
Does the CEL go off when you let go of the pedal, then go back on again when you press the pedal?

No.

Let's say I'm advancing from a stop, the pedal will work for a split second, then cut out completely, throwing a CEL at the same time. If I release the pedal, the CEL remains on for 3-4 seconds. Once the CEL goes out, I can continue driving.

If I press the pedal when the CEL is on, I get no response.
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post #7 of 10 Old 01-15-2014, 04:57 PM
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Still sounding like the idle switch.
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post #8 of 10 Old 01-15-2014, 05:06 PM Thread Starter
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Still sounding like the idle switch.

Where is the idle switch located? I'm not at my computer.
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post #9 of 10 Old 01-15-2014, 05:43 PM
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It's on the pedal. There are two connections on the pedal. Three-wire connection is the position sensor (variable resistor), two-wire connection is the idle switch. It's open when the pedal is not pressed, and closes as you start to move the pedal. One of the two terminals should have 12V when the key is in RUN, and the other goes to the PCM to tell it that you're pressing the pedal.
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post #10 of 10 Old 03-13-2014, 12:03 PM
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Mine just did the same thing today. I wiggled the connector on what I read is the idle switch and it started working again. Will check connections. If bad is there a part number or a place to pick up a new switch that is recommended.

Jim

1994.5 Ford F350 CCLB, 7.3 with only 135k, 5spd. For now all stock except for a S&B CAI and a Diamond Eye 4" from the turbo back, 305/70/16 BFG A/T's on 16x12 MT Classic II,tonneau cover and added 3rd fuel tank/toolbox combo for an extra 48 gals
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