Ok, so your check engine light came on.  You have opened the hood and checked that it is still there.  Now what do you do??

Test Procedure:

• Locate diagnostic box (small black box marked diag)

• Turn Car Off

• Use a wire or paper clip and insert ends into TE1 and E1

• Turn key to on position

• Check number of blinks of Check Engine Light

• Each "set" of blinks separated by a pause is a number. 

• Ex:  5 blinks, a pause, then 4 blinks would be 54.

• There will be a longer pause in between each code.

• Refer to the chart below.

• The ECU remembers old codes, so to erase them remove the negative cable from the battery for 30 seconds.

• A Constant steady blinking is normal operation

• After clearing the codes, test drive the car again, then check for more codes.

*Common error code fixes are in bolt print

Code	Description	What to do?
11 - ECU	Momentary interrupt in power	Check relays, IG switch
12 - RPM	No "G" signal to ECU for 2 sec after crank	Starting related, check distributor, starter
13 - RPM	No "NE" signal to ECU above 1000 RPM	Check distributor
14 - IGN	No "IGF" signal to ECU 8-11 times	Check Igniter, ignition coil
21 - O2	Detection of oxygen sensor detoriation	Check oxygen sensor
21 - O2	Open or short circuit in o2 sensor heater	Check oxygen sensor
22 - WTR	Open or short in Water Temp Sensor	Check Water Temp Sensor
24 - AIR	Open or short circuit in Air Temp Sensor	Check Air Temp Sensor
25 - O2	Excessive Lean Air Fuel Ratio	Check o2 sensor and fuel system
26 - O2	Excessive Rich Air Fuel Ratio	Check o2 sensor and fuel system
31 - AFM	Open circuit or short in VC signal	Test or replace Air flow Meter
32 - AFM	Open circuit or short in E2 signal	Test or replace Air flow Meter
34 - TRB	Fuel cut due to excessive turbo pressure	Check Wastegate Hose, Test Pressure Sensor
35 - TRB	Open or short circuit in Pressure Sensor	Test Turbo Pressure Sensor
41 - TPS	Open or short circuit in VTA signal	Test Throttle Position Sensor
42 - SPD	No "SPD" signal over 8 seconds driving	Check Vehicle Speed Sensor
43 - STA	No "STA" signal over 800 RPM starting	Check Ignition Switch
51 - IDL	No "IDL" or A/C signal during testing	Check TPS, A/C switch, Accelerator cable
52 - KNK	Open or short circuit in Knock Sensor	Check for broken/brittle wire, Replace Sensor
54 - INT	Intercooler Coolant Low or Pump Failure	Replace Water Level Sensor, Test IC W. Pump
71 - EGR	EGR gas temp below acceptable level	Check EGR system, (Valve/VSV/Hose/Temp)