Toyota
1990-1995 vehicles obd1 code retrieval
When the
check engine light shows up in your 1990-95 Toyota vehicle, the quickest way to
get the code is to access the diagnostic connector in the engine compartment (
usually sitting in the fender) or by the kick panel under the dash board in the
passenger side.

If there
are no codes, the check engine light will flash 2 times per second CONSTANTLY
with no patterns or pauses. If there are any codes, it will be shown in 2
digits codes. Example: code 24 is shown as 2 flashes, a pause followed by 4
flashes. If there are mode codes, the next one will transmitted after 2.5
seconds. (One some models, codes are displayed in one digit code only and the
difference is the codes are displayed with 4.5 seconds delay between codes).
When finished reading the codes, turn the key off and remove the jumper wire.
Shown above
is an example of the location of the diagnostic connector.
Here are
the common codes for Toyota vehicles 1988-95:
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
I have enjoyed reading through these posts, you take a very holistic approach to the automotive world. There doesn't seem to be enough of that around, keep it up!
ReplyDeletehttp://www.qtccars.com/