External fuel pump
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Yes, it is new. And I have a spare too. For my year, they didn't include the diode in the connector. I believe they started that in models after '88, although I am not certain of the year.
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Cargo Master
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From: Somewhere n North America
Still might want to check, I thought I read somewhere that the replacements came with a built-in diode.
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OK. Here's my thousandth question. Since diodes allow current to flow in only one direction, suppose I installed a diode and there happens to be another diode in the IAC connector. Current is still flowing in one direction. Would it hurt anything?
Cargo Master
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From: Somewhere n North America
Check your IAC for a "D" stamped into the plastic part.
"IAC diode acts as a freewheeling, (or flyback), diode that helps quickly turn off the IAC solenoid. Since the solenoid cannot stop current instantly, the flyback diode provides an alternate path for excess current when the coil is switched off. In other words, the diode takes the energy stored in the solenoid's coil when you switch the current off. Without the diode, the energy has no place to go and will cause a significant voltage spike that will damage the EEC. Rapid switching is important to the IAC as it has only two modes (on/off) which constantly fluctuates as commanded by the EEC."
Last edited by vjsimone; Jul 20, 2016 at 07:51 PM. Reason: Correcting text
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There is a "5D".
I have read that it causes your idle to surge.
Check your IAC for a "D" stamped into the plactic part.
"IAC diode acts as a freewheeling, (or flyback), diode that helps quickly turn off the IAC solenoid. Since the solenoid cannot stop current instantly, the flyback diode provides an alternate path for excess current when the coil is switched off. In other words, the diode takes the energy stored in the solenoid's coil when you switch the current off. Without the diode, the energy has no place to go and will cause a significant voltage spike that will damage the EEC. Rapid switching is important to the IAC as it has only two modes (on/off) which constantly fluctuates as commanded by the EEC."
Check your IAC for a "D" stamped into the plactic part.
"IAC diode acts as a freewheeling, (or flyback), diode that helps quickly turn off the IAC solenoid. Since the solenoid cannot stop current instantly, the flyback diode provides an alternate path for excess current when the coil is switched off. In other words, the diode takes the energy stored in the solenoid's coil when you switch the current off. Without the diode, the energy has no place to go and will cause a significant voltage spike that will damage the EEC. Rapid switching is important to the IAC as it has only two modes (on/off) which constantly fluctuates as commanded by the EEC."
Cargo Master
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From: Somewhere n North America
So who put the new IAC on your truck?
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I did. I rebuilt the engine and decided to replace all parts. Almost everything under the hood is new. The harness is original, but not much else is. The IAC is American made. Imagine that!
Cargo Master
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From: Somewhere n North America
So, check your old AIC to see if there is a "D" stamped on it?
If so, then maybe that is a replacement IAC, and the modification was made prior to you acquiring the truck.
Cargo Master
Joined: Jun 2013
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From: Somewhere n North America
Check your spare for a "D" code, and Part Number, when you get the chance.
What is the Part Number of your new IAC?
I'm leaning towards, nothing further to do.
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I see. The code on the valve connector is 5D. The part number is ABV00031.
The diode actually did arrive this evening and I put it in (and ran the vehicle). I'll pull it tomorrow and connect the red wire directly to the white wire, along with the grey wire that comes from the ECM eliminating the new diode I purchased. Right?
Steve
The diode actually did arrive this evening and I put it in (and ran the vehicle). I'll pull it tomorrow and connect the red wire directly to the white wire, along with the grey wire that comes from the ECM eliminating the new diode I purchased. Right?
Steve
