Hey Guys,
Hows it goin? I have a 92 SC300 and the orange check engine light keeps comming on. If I disconnect the battery the light will turn off for a couple of days, then turn back on again. Is there any way to check the engine codes without going to the dealer?
Thanks,
Jake.

 

Do a search, you should have a connector plug inside your car and another under the hood. By connecting different pins you can get a code from your check engine light.

 

goto autozone, they scan the codes for free.

 

I thought with 95 and older one could put the key in the ignition and then press the brake pedal down in about 3/4 of a second (really quick) and then the dash would flash out the code like morse code, i.e., OBDI.

Only with OBDII, 96 and later can you take it to Autozone, but would not be surprised if somebody at Autozone could figure OBDI out.

 

Hey Jake,

There are many posts on how to retrieve the engine code and what the code means. Do a search and you'll get dozens of hits. Listed below is a good description posted from member khark back in March on how to retrieve the codes.

Basically use a paper clip or wire to jump two connectors on the diagnosis terminal. One of the terminal should be below your left knee, to the lower left of the steering wheel behind/underneath the knee-pad dash area.

The other terminal (at least on my SC400) is in the engine bay right above the oil fill cap, little plastic rectangle box about 1"x2". Says Diagnosis right on the cover. You need to jump the E1 and TE1 terminals.

If you can't find the terminals PM me your email and I can email you a .pdf file from the Lexus service shop manual on "How to Proceed with Troubleshooting". The file has clear detailed pictures.

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5) To retrieve codes, turn ignition on. DO NOT start engine.
Using a jumper wire, connect terminals E1 and TE1 together either on
DLC1 or DLC2. See Fig. 2. Count number of flashes from Malfunction
Indicator Light (MIL).
6) If MIL flashes 2 times every second, system is functioning
properly (no codes present). This is known as a normal condition. If a
diagnostic code is displayed, first group of flashes will indicate
first digit of a 2-digit diagnostic code. After a 1.5 second delay,
second group of flashes will indicate second digit of diagnostic code.
7) If more than one code is stored, a 2.5 second delay will
occur between diagnostic codes. After all diagnostic codes have been
displayed, a 4.5 second delay will occur and then codes will be
repeated until jumper wire connecting terminals E1 and TE1 is
disconnected. Diagnostic codes will display from smallest to largest
number.
8) Identify and record diagnostic trouble codes. After
trouble codes are retrieved, remove jumper wire to exit Normal Mode.

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Here are the codes, posted by member Bladez42598

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ALL THE ERROR CODES FOR LEXUS AND WHAT THEY MEAN

1 Normal Condition.
2 Air Flow Meter signal.
3 Ignition signal.
4 Engine Coolant Temperature Sensor signal.
5 Oxygen Sensor.
6 RPM signal (Crank Angle Pulse).
7 Throttle Position Sensor signal.
8 Intake Air Temperature Sensor signal.
9 Vehicle Speed Sensor signal.
10 Starter signal.
11 Switch signal.
11 ECU/ECM.
12 Knock Control Sensor signal.
12 RPM signal.
13 Knock Control CPU (ECM).
13 RPM signal.
14 Turbocharger Pressure.
14 Ignition signal.
21 Oxygen Sensor.
22 Engine Coolant Temperature Sensor signal.
23 Intake Air Temperature Sensor signal.
24 Intake Air Temperature Sensor signal.
25 Air-Fuel Ratio Lean.
26 Air-Fuel Ratio Rich.
27 Sub Oxygen Sensor signal.
28 No. 2 Oxygen Sensor signal.
31 Air Flow Meter signal (Vacuum Sensor signal).
32 Air Flow Meter signal.
34 Turbocharger Pressure signal.
35 Turbocharger Pressure Sensor signal.
35 HAC Sensor signal.
41 Throttle Position Sensor signal.
42 Vehicle Speed Sensor signal.
43 Starter signal.
51 Switch signal.
52 Knock Sensor signal.
53 Knock Sensor signal.
54 Inter-cooler ECM signal.
71 EGR System.
72 Fuel Cut Solenoid signal.
78 Fuel Pump Control signal.
81 TCM Communication.
83 TCM Communication.
84 TCM Communication.
85 TCM Communication.

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Thanks
LexusBiz

 

i have a 95 sc400 im geting a code 13 rpm signal any one know what that means

 

A lot of people from around where I am are having the same problem with the light throwing on and off, becasue of little little things, like mine is an oxygen sensor becasue i ran over a stick and bam it threw the light. good luck finding it out