Posts by kbprice
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The 2 wires that we cut were for the #1 and #2 oxygen sensors. We tied B48(OX1) into B47(OX2) This eliminated the need to have both front and rear OX sensors on the exhaust manifold, rear sensor now supplies both signals. As for the MAF conversion it is fairly straight forward as long as you can understand the Toyota service manuals. I'll do my best to expalin it though.
There are 5 wires on the OBDII MAF, you will only use 4 of them(Black w/Red not used).
1. Black/Red - 9-14v Power (not used)
2. Yellow/Red - VG signal from B66
3. P/L - THA signal from B45
4. Brown/Black - Ground E1
5. Brown - E2
There are 5 wires on the OBD1 MAF
1. Brown/ Black - Ground E2
2. P/L - THA signal from B45
3. LG/B - Karmon signal from B66
4. L/R - VCC signal from B41
5. Brown - Ground E1
The only difference is the #4 wire on the OBD1 plug. This signal needs to be gotten from the TPS sensor #4 wire VCC signal.
OK so here is the overall way it connects:
OBDII #5 - OBDI #5
OBDII #4 - OBDI #1
OBDII #3 - OBDI #2
OBDII #2 - OBDI #3
OBDII #1 - Not Used
OBDI #4 - TPS #4
I know this may be confusing but if you have a service manual it really helps.
As for your other questions. Yes a OBD1 auto ecu will work. The open loop thing I am not sure about however. You will need a MKIII chip for your VPC and make sure your resister is in the correct position.
Disclaimer: I am not responsible if you fuck up your car trying to do this conversion!
There are 5 wires on the OBDII MAF, you will only use 4 of them(Black w/Red not used).
1. Black/Red - 9-14v Power (not used)
2. Yellow/Red - VG signal from B66
3. P/L - THA signal from B45
4. Brown/Black - Ground E1
5. Brown - E2
There are 5 wires on the OBD1 MAF
1. Brown/ Black - Ground E2
2. P/L - THA signal from B45
3. LG/B - Karmon signal from B66
4. L/R - VCC signal from B41
5. Brown - Ground E1
The only difference is the #4 wire on the OBD1 plug. This signal needs to be gotten from the TPS sensor #4 wire VCC signal.
OK so here is the overall way it connects:
OBDII #5 - OBDI #5
OBDII #4 - OBDI #1
OBDII #3 - OBDI #2
OBDII #2 - OBDI #3
OBDII #1 - Not Used
OBDI #4 - TPS #4
I know this may be confusing but if you have a service manual it really helps.
As for your other questions. Yes a OBD1 auto ecu will work. The open loop thing I am not sure about however. You will need a MKIII chip for your VPC and make sure your resister is in the correct position.
Disclaimer: I am not responsible if you fuck up your car trying to do this conversion!
By the way I've got 2 OBDI 5speed ecu's for sale 1 - 5 of 5 Posts
