86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Obd port???

Old 03-02-2019, 11:01 AM
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Obd port???

Hi everyone new to the thread. I was wondering if anyone knows where the obd port is on my 1987 toyota pickup. I would like to add that it is a automatic with a 22r engine with a carburetor. Ive been searching for information about this but something tells me that the carburetor vehicles dont use a obd ports. My "mechanic" said he needs to diagnose the truck and put it in the computer but i have doubts about it. i think its all bs to get more money from my dad since he said the same thing 2 years ago. His truck did not pass smog. Tech says its burning too much gas. Truck has new plugs, wires, distributor, rotor, 02 sensor new oil and filter and air filter. The basics. I have a feeling its the carburetor. Any help is highly appreciated.
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Old 03-02-2019, 11:14 AM
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Yeah, I'm not entirely sure, but I don't think the guy knows what he's talking about in reference to plugging in the computer. Check this out for diagnostic trouble codes. 4Crawler has some great write-ups.
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Old 03-02-2019, 11:20 AM
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This doesnt help me because like i said i have a carburetor not EFI. thanks for the info though
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Old 03-02-2019, 11:55 AM
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Is this a regular Federal Emissions Truck or a California Emissions Truck?

I know for a fact that 1987 Federal Emissions 22R carbureted Trucks do not have an OBD or Diagnostic port. The Federal Emissions 22R Trucks have a small Emissions Computer.

The fact that you mention an oxygen sensor tells me you have a California Emissions Truck, which have a more sophisticated computer for the fuel feedback system. According to my 1987 Toyota Factory Repair Manual, there is a Diagnostic Port but it appears that it only a check connector (the manual calls it the Check Connector) to see if the Emissions computer is getting oxygen sensor input and the like (check using a multimeter or oscilloscope). You would not be able to use a scan tool for this system.

These systems can get tricky to diagnose and not many mechanics are familiar enough with these to know what to do.

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Old 03-02-2019, 09:04 PM
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The California (c.a.r.b.) models have a slightly larger emissions computer twenty something pins, they also have an oxygen sensor and two way catalytic.

The Fed/Canada models have a slightly smaller emissions computer about a dozen pins.

Neither have OBD2, it wasn't a standard in this era.

You, your father, and your mechanic should invest the time to locate a Factory service manual (FSM). There is a whole section dedicated to the test procedure for the fuel feed back system in the emissions control section.

With the vauge description of "it will not pass emissions" there isn't much for us to tell you from an educated stance.. Is the cat worn out, is the oxygen sensor functioning, do the temp switch's work, what about the two valves that add air to the exhaust and intake..

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