1. Cycle the ignition key ON-OFF-ON-OFF-ON within 5 seconds. To cycle the ignition key ON means to turn it only as far as it takes to get the radio to come on. It does not mean to turn the engine on.

2. Count the number of times the "check engine" lamp on the instrument panel flashes on and off. The number of flashes represents the code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses separate individual codes. For example, flash-flash-flash [pause] flash-flash represents the code 32.

A code of "55" represents end of error codes.  If this is all you get then no error codes are stored in the computer.  This is the normal condition for a neon.

CODE  Description of Trouble Code
11   Timing belt skipped 1 tooth or more from initial learned value, Intermittent loss of either camshaft or crankshaft position sensor, No crank reference signal detected during engine cranking
12   Direct battery input to PCM was disconnected within the last 50 key-on cycles
13   No change in MAP from start to run
14   MAP sensor voltage too low
15   No vehicle speed sensor signal
17   Closed loop temp not reached or engine cold too long
21   02s sensor problem (oxygen sensor), upstream or down stream
22   Engine coolant temp sensor out of range
23   Intake air temp sensor out of range
24   Throttle Position sensor out of range
25   Idle air control motor circuits, target idle not reached (+/- 200),vacuum leak found
27   Injector control circuit
31   Evap purge flow monitor failure or evap solenoid circuit
32   EGR system failure
33   A/C clutch relay circuit
34   Speed control Solenoid circuits
35   Rad Fan control relay circuit
37   Torque converter clutch solenoid CKT or park/neutral switch failure
41   Generator field not switching properly
42   Fuel pump relay control ckt, Auto shutdown relay control ckt, No ASD relay output voltage at PCM, Fuel level sending unit volts out of range, Fuel level unit No change over miles
43   Multiple/ single cylinder misfire
44   Battery temp sensor volts out of range
46   Charging system voltage too low
51   Fuel system lean
52   Fuel system rich
53   Internal control failure
54   No Cam signal at PCM
55   End of error messages (If you get this only, no errors were found)
62   PCM failure SRI mile not stored
63   PCM Failure EEPROM write denied
64   Catalytic Converter Efficiency Failure
65   Power steering switch failure