1988 22RE diagnostic port pinout
#3
Wy9 - E1 is engine ground while E2 is sensor ground. Grounding T causes stored codes to flash on the CEL. The tach signal is on Ig-.
AFAIK other pins are:
Fp - fuel pump voltage control
Cco - catalytic converter temperature
+B - battery +
Vf - digital representation of response to O2 sensor
Ox - O2 sensor actual voltage
I don't know what Ect and Tem are for.
I think the diagnostic connector is under-utilized, but a good place to start testing because it's easy to hook up to.
AFAIK other pins are:
Fp - fuel pump voltage control
Cco - catalytic converter temperature
+B - battery +
Vf - digital representation of response to O2 sensor
Ox - O2 sensor actual voltage
I don't know what Ect and Tem are for.
I think the diagnostic connector is under-utilized, but a good place to start testing because it's easy to hook up to.
#4
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Just speculating, but Ect might be Engine Coolant temperature. It would be a voltage between zero and 5 volts related to the coolant temp. The conversion formula is complex. The code below will turn volts into temperature. (sorry about the lack of indentation - not sure how to preserve the indents when pasting into the forum.)
No guesses as to what Tem might be.
Function TempECT(ByVal ECTvolts As Single) As Single
ECTvolts = 5 - ECTvolts
Select Case ECTvolts
Case 0.0 To 0.5
TempECT = 80 + (0.5 - ECTvolts) * 100
Case 0.5 To 0.9
TempECT = 60 + (0.9 - ECTvolts) * 50
Case 0.9 To 1.5
TempECT = 40 + (1.5 - ECTvolts) * 33.33
Case 1.5 To 2.4
TempECT = 20 + (2.4 - ECTvolts) * 22.22
Case 2.4 To 3.4
TempECT = 0 + (3.4 - ECTvolts) * 20
Case 3.4 To 5
TempECT = -20 + (4.3 - ECTvolts) * 22.22
Case Else
TempECT = ECTvolts
End Select
If Units = "english" Then
TempECT = TempECT * 1.8 + 32 ' Convert to deg F
End If
End Function
No guesses as to what Tem might be.
Function TempECT(ByVal ECTvolts As Single) As Single
ECTvolts = 5 - ECTvolts
Select Case ECTvolts
Case 0.0 To 0.5
TempECT = 80 + (0.5 - ECTvolts) * 100
Case 0.5 To 0.9
TempECT = 60 + (0.9 - ECTvolts) * 50
Case 0.9 To 1.5
TempECT = 40 + (1.5 - ECTvolts) * 33.33
Case 1.5 To 2.4
TempECT = 20 + (2.4 - ECTvolts) * 22.22
Case 2.4 To 3.4
TempECT = 0 + (3.4 - ECTvolts) * 20
Case 3.4 To 5
TempECT = -20 + (4.3 - ECTvolts) * 22.22
Case Else
TempECT = ECTvolts
End Select
If Units = "english" Then
TempECT = TempECT * 1.8 + 32 ' Convert to deg F
End If
End Function
Last edited by RJR; 10-26-2014 at 05:06 PM.
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