How to Self Diagnose Your Check Engine Light Codes.

Look for the black,rectangular box that says "DIAGNOSIS" on the drivers side of the engine compartment, flip it open and you will see a map of the names of the connections on the inside of the cover. With your engine warmed up to normal operating temperature, shut it off, get hold of a paper clip or a similar jumper wire and short circuit the GND and TEN connections together. Return to the driver's seat and turn your ignition key to ON (position II) but DO NOT start the engine. Keep your eyes glued to the CHECK ENGINE light in your instrument panel (lower left hand corner of the 4-light cluster). It will blink to tell you the codes of any engine malfunctions. Each code is a 2-digit number with the 'tens' being flashed first and then followed by the 'units' 1.6 seconds later. This will be repeated with 4-second intervals in between. For example, if the code is 12, the light will flash once, pause for 1.6 seconds, then flash twice, pause for 4 seconds and then repeat itself over again. If there is more than one problem, then each individual code will be separated by a 4-second interval and after the entire sequence is complete, it will be repeated again.

The codes are displayed below :

1 = Ignition pulse

2 = No signal

3 = G signal

4 = ('94)SGT signal

8 = Airflow meter

9 = Water thermostat

10 = Intake air thermostat in airflow meter

12 = Throttle position sensor

14 = Atmospheric pressure sensor

15 = Oxygen sensor (output too low)

16 = ('94)EGR function sensor

17 = Oxygen sensor (output not changing)

25 = ('94)PRC solenoid valve

26 = Solenoid valve (evaporative canister purge)

28 = ('94)EGR solenoid valve (vacuum)

28 = ('94)EGR solenoid valve (vent)

34 = Idle air control valve

36 = Idle speed control valve



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