1Byounkin
Well-Known Member
- Joined
- February 8, 2010
- Messages
- 190
- Reaction score
- 1
- City, State
- Gallatin, TN
- Year, Model & Trim Level
- '91 4x4 XLT
I have a 1991 explorer A4LD and I'm having trouble not going into OD.
Here is what I know (thanks to Maniak):
The TCC locks up. All shifts work but OD.
Have checked ohms on both TCC and the 3/4 and both read good ohms.
I have connected wires to the RED , orange/yellow drove it to see if 12v are being sent from the ECM. No voltage was sent to the transmission for the OD (3/4).
Checked the coolent temp sensor and reads good.
I pulled codes with the koeo test, a code 22 came up. Which is the MAP/BAP sensor. I've read and heard that only a few had in 1991 had used the MAP/BAP sensor. Note: the MAP sensor and the BAP sensor are the same just the functions are change. The MAP sensor was like the MAF now.
I've checked the TPS and it reads good. I know that the VB is good in the transmission and all the other stuff in the transmission.
What does the ECM need to know to shift into OD?
Is it the BAP/MAP sensor?
Please help me with this.
Thanks
Here is what I know (thanks to Maniak):
The TCC locks up. All shifts work but OD.
Have checked ohms on both TCC and the 3/4 and both read good ohms.
I have connected wires to the RED , orange/yellow drove it to see if 12v are being sent from the ECM. No voltage was sent to the transmission for the OD (3/4).
Checked the coolent temp sensor and reads good.
I pulled codes with the koeo test, a code 22 came up. Which is the MAP/BAP sensor. I've read and heard that only a few had in 1991 had used the MAP/BAP sensor. Note: the MAP sensor and the BAP sensor are the same just the functions are change. The MAP sensor was like the MAF now.
I've checked the TPS and it reads good. I know that the VB is good in the transmission and all the other stuff in the transmission.
What does the ECM need to know to shift into OD?
Is it the BAP/MAP sensor?
Please help me with this.
Thanks