DES_YODA

OK... so here's the deal i just bought a 1988 toyota pickup v6 for $1400

The main problem was that the desert rats here in AZ chewed up the big bundle of wires coming out for the ECU. I said no biggie and went down to the wreck-yard and got me the wires for a 91 or 92 4runner i don't remember(there was no pickups the had the wiring that were even close to the year so that's why i got the 4runner's wiring).

later on i found out that the wire connectors for the ECU of the 199x 4runner i got were not the same, but most of the wires were the same coloring and gauge, so I decided to just splice in the chewed up parts using the wires i got.

I got out my trusty Chilton toyota trucks 1970-88 repair MANual out and found a diagram of 88 v6 wiring. A few hours later and i got all the wiring done with the exception of the solid Blue wires and solid brown wires.

Right now im working on the Blues where i need help and i havn't even looked at the Browns yet. Two Blues come out of the ECU, 1 to the Air flow meter and the other to the EGR sensor for the cali model or brigded for the non-cali seen below.



I just need to know witch Blue connects to what, if i had the pinout-diagram from the ECU that would solve this or if someone has a 88 v6(pickup or 4runner) to test the Air flow meter pin/connector to the ECU pin/connector shown below



I just need to know witch blue goes to the Air flow meter(pin/connector shown below) and witch one needs to be bridged. I hope to get some help here thanks guys if you have any questions just ask.



In the mean while i will be figuring out the Solid Brown wires, hopely i wont run into any problems there...

DES_YODA

I just finished the Solid Brown wires off... im just waiting for any help here to see what to do of the remaining two Blue wires...

Any ideas would help THX

Northern Sun

what are u try to do? 1gen and second are different

DES_YODA

I know that, are that's why i didn't use the wiring from the 91 4runner... i used the original wiring i just splices in new wire where the damage was, but keeping the original wiring connectors...

if you have any specific question please ask, this is the only thing holding me back from continuing my full repair on this truck

THX

skypilot

iTrader: (1)

You got another problem too..

The '88 injectors are not compatible with any other year. There is a resistor pack in the '88 circuit to keep them from smoking up. You may have fried them, maybe not. I hope to hell they are alright.

I have an 88 V6 ecu and wiring harness that I got from a fellow on this board. I also have an '88 V6 runner with a '91 engine & harness. Go get a '91 ECU to save problems. Then hot wire the three +B to the ECU and hot wire the CSI to a PB to shott gas into the engine so it starts.

I'll tell you this, that '91 harness was a mistake. It has three hot leads and the ECU only has one. I spent a lot of time making that '91 engine run in an '88 chassis.

DES_YODA

Maybe its my fault for not explaining well enough...

I didn't use the '91 harness but i did get one thinking it would work(1st mistake i made). So knowing that i could not use the '91 harness i decided to repair the wires on the original '88 harness(that the rats chewed up). I did that repair by soldering the damaged(chewed up) wires back together. the only problem is the two blue wires i don't know witch is to the Air Flow meter or EGR sensor(that my truck doesn't have... the connector for that sensor is just bridged)

i hope that made sense...

thx for posting

if you need more picture just ask

4wd4fun

solid brown are grounds.
solid blue is +12v source. shouldn't matter which is spliced.

DES_YODA

Thx.. i will be sure to check that tomorrow

any more input is still welcomed

DES_YODA

I checked for voltage on the solid blues and I got 5.2v when switch is no... Is that normal?

Northern Sun

better than 0.3v or 0.8v; im pretty sure that even small crack somewhere in the harness would have voltage elevation somewhere else;

4wd4fun

i'd have to recheck things to be sure but only circut specific wires get special colors. nearly every ground is brown so that's pretty safe to guess. if both blues are the same volts they may be regulated to supplyu that and the returns will tell the ecu what the readings are.

Hadmatt54

If you wire according to the blanket statement above your going to get in trouble! I don't have an 88 wiring diagram manual, but I do have an 89 4Runner one for the 3vze.
The pinouts for the ECU are the same as the picture in your first post. Pin #5 of the 24 pin connector is THA which goes to the air flow meter. Pin 18 of the 18 pin connector is THG which goes to short pin (except California) or the EGR gas temp sensor for California.
Take an ohmmeter and check continuity from the blue of the AFM back to where you are going to splice, once you identify the severed end it will be spliced to the THA blue.

5 volts is generally the sensor reference voltage, 5.2 on the blues sounds about right!

MudHippy

I wouldn't go by the wire colors in the Chilton personally.

Here's the pinout...


And the wiring diagram from a Toyota publication.

Hadmatt54

Like I said!

DES_YODA

Thanks guys!