Because I was having a hard time finding this, I'm posting it here, for at least my own future reference. Refered to as the "Key dance", the CEL will flash out engine error codes.

95-98 Eclipse (Non-Turbo) Retrieval Without Scan Tool

1. Cycle the ignition key On-Off-On-Off-On within 5 seconds.



2. Count the number of times the malfunction indicator lamp (check engine lamp) on the instrument panel flashes on and off. The number of flashes represents the trouble code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses (approx. 4 seconds) separate individual trouble codes.
3. Repair the malfunction while referring to the inspection chart for diagnostic trouble codes.
4. After disconnecting the battery cable from the battery (-) terminal for 10 seconds or more, reconnect the cable.
5. Start the engine and run it at idle for about 15 minutes after the engine has warmed up.

MPFI
95-98 Eclipse (Non-Turbo)
Check Engine/Light Scan Tool
11 Intermittent Loss Of Crankshaft Position Sensor.
11 Misfire Adaptive Numerator at Limit.
11 No Crankshaft Reference Signal at PCM.
11 Timing Belt Skipped 1 Tooth or More.
13 No Change In Manifold Absolute Pressure (MAP) From Start To Run.
14 5-Volt Supply Output Too Low.
14 Manifold Absolute Pressure (MAP) Sensor Voltage Too High.
14 Manifold Absolute Pressure (MAP) Sensor Voltage Too Low.
14 No 5 Volts To Manifold Absolute Pressure (MAP) Sensor.
15 No Vehicle Speed Sensor Signal.
16 Knock Sensor No. 1 Circuit.
17 Closed Loop Temperature Not Reached.
17 Engine Is Cold Too Long.
21 Downstream Heated Oxygen Sensor Heater Failure.
21 Downstream Heated Oxygen Sensor Shorted To Voltage.
21 Downstream Heated Oxygen Sensor Stays at Center.
21 Downstream Heated Oxygen Sensor Stays at Center.
21 Downstream Heated Oxygen Sensor Voltage Grounded.
21 Slow Upstream Heated Oxygen Sensor Circuit during Catalyst Monitor.
21 Upstream Heated Oxygen Sensor Heater Failure.
21 Upstream Heated Oxygen Sensor Response.
21 Upstream Heated Oxygen Sensor Shorted To B+.
21 Upstream Heated Oxygen Sensor Stays at Center.
21 Upstream Heated Oxygen Sensor Voltage Grounded.
22 Engine Coolant Temperature Sensor Voltage High.
22 Engine Coolant Temperature Sensor Voltage Low.
23 Intake Air Temperature Sensor Voltage High.
23 Intake Air Temperature Sensor Voltage Low.
24 No 5 Volts To Throttle Position Sensor.
24 Throttle Position Sensor Voltage Disagrees With Manifold Absolute Pressure.
24 Throttle Position Sensor Voltage High.
24 Throttle Position Sensor Voltage Low.
25 Idle Air Control Motor Circuits.
25 Target Idle Not Reached (plus or minus 200 RPM).
27 Injector No. 1 Control Circuit.
27 Injector No. 2 Control Circuit.
27 Injector No. 3 Control Circuit.
27 Injector No. 4 Control Circuit.
31 EVAP Leak Monitor Pinched Hose found.
31 EVAP Purge Flow Monitor Failure.
31 EVAP Solenoid Circuit.
31 EVAP Solenoid Switch or Mechanical Fault.
31 EVAP System Large Leak.
31 EVAP System Small Leak.
31 EVAP Vent Solenoid Circuit.
31 Engine Coolant Temp sensor voltage too high.
32 EGR Solenoid Circuit.
32 EGR System Failure.
33 A/C Clutch Relay Circuit.
35 High Speed Fan Control Relay Circuit.
35 High Speed Radiator Fan Relay Circuit.
35 Low Speed Fan Control Relay Circuit.
36 PAIR Solenoid Circuit - M/T.
36 Too Little or Too Much Secondary Air.
37 Park/Neutral Position Switch Failure.
41 Alternator Field Not Switching Properly.
42 Fuel Level Sensing Unit Voltage Too High.
42 Fuel Level Sensing Unit Voltage Too Low.
42 Fuel Level Unit No Change Over Miles.
42 Fuel Pump Relay Control Circuit.
42 MFI (ASID) Relay Control Circuit.
42 No MFI (ASD) Relay Output Voltage at PCM.
43 Cylinder No. 1 Misfire.
43 Cylinder No. 2 Misfire.
43 Cylinder No. 3 Misfire.
43 Cylinder No. 4 Misfire.
43 Ignition Coil No. 1 Primary Circuit.
43 Ignition Coil No. 2 Primary Circuit.
43 Multiple Cylinder Misfire.
44 Battery Temperature Sensor Voltage Too High.
44 Battery Temperature Sensor Voltage Too Low.
44 Battery Temperature Voltage out of limit.
45 EATX Controller Trouble Code Present.
46 Charging System Voltage Too High.
47 Charging System Voltage Too Low.
51 Fuel System Lean.
52 Fuel System Rich.
53 Internal Controller Failure.
53 PCM Failure - Serial Peripheral Interface Communications.
54 No Cam Signal at PCM.
61 BARO Pressure Out Of Range.
62 PCM Failure - Service Reminder Indicator Mile Not Stored.
63 PCM Failure - EEPROM Write Denied.
64 Catalytic Converter Efficiency Failure.
65 Power Steering Pressure Switch Failure.
66 No CCD Messages From TCM - A/T.

12 direct power input to the PCM has been disconnected within the last 50 key-on cycles

55 End of error messages (if this code is the only one indicated, no errors were encountered)


I always kept a copy of them in my glove box.

^^ didn't throw those in because they are standard codes, but yeah, those are accurate.