darhus
New Member
- Joined
- September 11, 2013
- Messages
- 3
- Reaction score
- 0
- City, State
- calgary alberta
- Year, Model & Trim Level
- 98 explorer
ECT voltage versus temperature
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Hi everyone
Im new here. I hope someone can confirm my findings before I spend my money. Ive got a 98 explorer 4wd 4.0L SOHC engine code E. My truck has a idling issue when cold .It searches till it reaches operating temp. The ECT signal to the ECM is clean . With it unplugged, at the sensor , the voltage at the ECM ( back probing the green /red wire)is 4.75 v with the ECT connector shorted (with a cotterpin) the voltage is 0 . I see this on the scanner . The problem is the ECT temp on the scanner does not change . The IAT react like it should -40 to 240 degrees . Im thinking the ECM is fried. Anything else to check before purchasing an ECM ? Has anyone run into this before . In the morning the scanner says the temp is higher then what it really is and the fuel trim numbers indicate running lean. The ECT voltage is in the right neighbourhood .
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Hi everyone
Im new here. I hope someone can confirm my findings before I spend my money. Ive got a 98 explorer 4wd 4.0L SOHC engine code E. My truck has a idling issue when cold .It searches till it reaches operating temp. The ECT signal to the ECM is clean . With it unplugged, at the sensor , the voltage at the ECM ( back probing the green /red wire)is 4.75 v with the ECT connector shorted (with a cotterpin) the voltage is 0 . I see this on the scanner . The problem is the ECT temp on the scanner does not change . The IAT react like it should -40 to 240 degrees . Im thinking the ECM is fried. Anything else to check before purchasing an ECM ? Has anyone run into this before . In the morning the scanner says the temp is higher then what it really is and the fuel trim numbers indicate running lean. The ECT voltage is in the right neighbourhood .