Wyo4Runner

I have an '87 4 Runner, 22RE.
Any suggestions for a decent code reader?

Time for me to grow up diagnostically.

Thanks!

ksti

Yes, a good paper clip and a chart of codes that can be stored.

Code 11 Momentary interruption in power supply to ECU (electronic control unit or computer) up to 1991
Code 12 Engine revolution signal missing
Code 13 Rpm signal to ecu missing above 1000 rpm
Code 14 Igniter signal to ecu missing
Code 16 A/T control signal missing from ecu
Code 21 Main oxygen sensor signal fault
Code 22 Water temperature sensor circuit fault
Code 23 and 24 Intake air temperature signal fault
Code 25 Air/fuel ratio LEAN
Code 26 Air/fuel ratio RICH
Code 27 Sub-oxygen sensor signal or heater circuit fault
Code 28 No.2 oxygen sensor/heater signal fault
Code 31 and 32 Air flow meter circuit or Vacuum sensor signal fault
Code 34 and 36 Turbo-charging pressure signal fault
Code 35 Altitude compensation sensor signal fault
Code 41 Throttle position circuit fault
Code 42 Vehicle speed sensor circuit
Code 43 No starter signal to the ecu
Code 51 AC signal on; DL contact off (in trany shifter with diagnostic connector jumped)
Code 52, 53 and 55 Knock sensor fault
Code 71 EGR system malfunction
Code 72 Fuel cut solenoid signal fault
Code 78 Fuel pump control signal fault
Code 81, 83, 84 and 85 TCM communication fault

metalhed

OBD 1 vehicle codes can be read with a paperclip or a piece of wire
No need for a scanner
plug in the wire turn the key
count the light flashes

millball

I have got a vintage high end Snap-On Mt-2500 scanner and software cartridges for early Aisian imports that is able to read real time sensor output values and run several different diagnostic routines on my late model ('95) OBD=1 Runner. This scanner was very helpful to me when my '95 was giving me problems.
Although my '87 Runner has the same format diagnostic plug as the '95 does, it does'nt appear that the simpler ECM computer on the '87 supports the same level of data stream output as the '95 computer does. All I could get out of the scanner when I had it hooked up to the '87 was the stored trouble codes. I could'nt find any real time data streaming; although I have to say that I am not completely familiar with the early Toyota OBD-1 systems yet and how the scanner looks at them. There may be a way to get more data out than I know at this point. I need to fool with the scanner some more on the '87 truck.
At this point though, the paper clip method will tell you everything my scanner has told me.
On later OBD-1 models though, it acts as much more than a mere code reader.
These old MT-2500 scanners can be picked up for a couple hundred $$, and with the correct adapters and software cartriges they are a wonderful tool on most makes and models of older cars.
New price, back in the day, was in the thousands of $$.
Software can be got for them covering all makes and models including make and model specific OBD-2 up to at least 2004. Heck, mine even came with software for jeeps.

Wyo4Runner

I can't believe I missed the paper clip lesson before this.
Just thought I had to have the computer.
Too cool!

It's like someone pointed out the elephant that has been standing right in front of me for a very long time.

As far as the vintage scanner goes, that could be fun to mess with some day. Vintage electronics still don't feel vintage to me.