10-4....
I appreciate all the input, folks! |
Originally Posted by Takeda
(Post 5996)
If you unplug the IAC, does the idle decrease?
Yes.... I unplugged the wiring connector and the idle is normal. This is a new IAC. So.... something is telling the IAC to energize? |
3 Attachment(s)
Here is the ECT (Engine Cooling Temp) Sensor
https://www.f150-forums.com/attachme...ine=1322418839 https://www.f150-forums.com/attachme...ine=1322418839 https://www.f150-forums.com/attachme...ine=1322418839 The block is about 60 deg F. The resistance is 21K |
The 22k reading is normal.
I bought another sensor and it reads the same. As you heat the sensor, the resistance goes DOWN. I think I'll check the connector for voltage. NO sensor connected (if the wire was broken) would mean excessive heat... unless the computer sees it as a failure. CORRECTION.... No sensor would be infinte resistance which would be the COLDEST indication. |
With key on, but not running, the ECT connector has 4.66 VDC.
This would mean the wires are not broken going to the sensor. So what other items would tell the IAC to engage? The AC is not on. The ECT is good. ????? |
Originally Posted by DEET
(Post 6025)
Yes....
I unplugged the wiring connector and the idle is normal. This is a new IAC. So.... something is telling the IAC to energize? I don't think so. When the IAC is unplugged the engine should idle extremely slow, to the point of almost stalling. You may want to check the voltage on the throttle position sensor again, to make sure the throttle is going to the rest position. |
Originally Posted by DEET
(Post 6031)
The 22k reading is normal.
I bought another sensor and it reads the same. As you heat the sensor, the resistance goes DOWN. I think I'll check the connector for voltage. NO sensor connected (if the wire was broken) would mean excessive heat... unless the computer sees it as a failure. |
Originally Posted by DEET
(Post 6032)
With key on, but not running, the ECT connector has 4.66 VDC.
This would mean the wires are not broken going to the sensor. So what other items would tell the IAC to engage? The AC is not on. The ECT is good. ????? |
Measured the 4.66 with the sensor disconnected.
Thanks for pointing out the "infinite resistance" mistake.... |
I double checked the TPS sensor and voltage (1.01 VDC) before I bolted the throttle body back on. The throttle cables didn't move the throttle arm. I opened and closed the throttle and watched the voltage change.
It always went back to 1.01 VDC. Is the IAC "variable" or is it "two position"? Thanks again for all the help.... |
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