ECU Codes.
1990 and 1991 Tegs:
Your ECU is located under the carpet on the passenger side of the car. You have to pull back on the carpet to expose the ECU which is brass in color. There is a circular window on the face of it with red LED in it. This LED will blink and this is where you read your code.
To get the LED to blink, you must turn the car to the "ON" position but do not start it. The LED will blink with slow blinks and with fast blinks. If you have four slow and two fast, that is code 42.


if you car isnt throwing any codes will the ECU led light still blink ? or is it my led light is burnt out.

 

yeah your ecu stores the code if the CEL comes on and you turn the ignition off and back on.. the CEL will go off but the ecu should still store the code.. as for 42 im not sure what that is but heres a list of CEL for your car...


0 - ECU
1 - Oxygen Sensor
3 - MAP Sensor
5 - MAP Sensor
6 - Crank Angle
7 - Throttle Angle
8 - TDC Position
9 - No. 1 Cylinder Position
10 - Intake Air Temperature
12 - Exhaust Gas Recirculation (EGR) System
13 - Atmosphere Pressure
14 - Electronic Air Control
15 - Ignition Output Signal
16 - Fuel Injector
17 - Vehicle Speed Sensor
20 - Electronic Load Detector
22 - VTEC System Malfunction
23 - Knock Sensor
41 - O2 Sensor
43 - Fuel Supply System
45 - System Too Rich or Too Lean
48 - Primarry Heated O2 Sensor
54 - Crankshaft Speed Fluctuation Sensor
61 - Primary O2 Sensor Circuit
63 - Secondary O2 Sensor Circuit
67 - Catalyst System
70 - Automatic Transaxle
71-74 - Random Misfire
80 - Exhaust Gas Recirculation
86 - Engine Coolant Temperature Circuit
90 - Evaporative Emission Control System Leak Detected
91 - Fuel Tank Pressure Circuit
92 - Evaporative Emission Control System Insufficient

 

so ur car only throws codes when it needs too ? no blinking light means ur goood ?