Cyama Posted February 2, 2018 Share Posted February 2, 2018 I have noticed the check engine light intermittently lighting up. Sometimes in the morning and sometimes while it's warmed up. If there is a problem in the morning the car is a little harder to start like the choke isn't working. Of course it's efi, so that doesn't make sense, but maybe it's the cold start injector or something like that. If it lights up when the car is warm it really doesn't have any power, like it's in limp mode. how can I read the codes, or does someone have ideas on this symptom? 1 Quote Link to comment Share on other sites More sharing options...
Ibreakstuff Posted February 2, 2018 Share Posted February 2, 2018 Great reference: http://www.ultimatesubaru.org/forum/topic/47526-subaru-ecu-codes-for-1983-1988/This still applies to the Loyales-- 1988 and Later Models With Single-Point Fuel Injection -- CODE PROBABLE CAUSE 11 Crank Angle Sensor or Circuit 12 Starter Switch or Circuit 13 Crank Angle Sensor or Circuit 14 Fuel Injector - Abnormal Output 21 Coolant Temperature Sensor or Circuit 23 Air Flow Meter or Circuit 24 Air Control Valve or Circuit 31 Throttle Sensor or Circuit 32 Oxygen Sensor or Circuit 33 Vehicle Speed Sensor (VSS) or Circuit 34 EGR Solenoid or Circuit 35 Purge Control Solenoid or Circuit 42 Idle Switch or Circuit 45 Kick-Down (Detent) Relay or Circuit 51 Neutral Switch Continuously in the On Position 55 EGR Temperature Sensor or Circuit 61 Parking Switch or Circuit I can't recall if you have to connect the test plugs or not with the loyales, I seem to recall my old 90 loyale would show the ECU blinking lights with the key turned on regardless. Quote Link to comment Share on other sites More sharing options...
Ibreakstuff Posted February 2, 2018 Share Posted February 2, 2018 (edited) And these could be helpful too:http://www.ultimatesubaru.org/forum/topic/18385-reading-codes-on-94-loyale-edit-92-not-94/http://www.ultimatesubaru.org/forum/topic/3992-one-more-timehow-do-you-check-ecu-trouble-codes-on-ea82/Basically you remove the plastic guard under the steering column to view the LED on the ECU. The process of connecting the test cables is listed in the post(s) above. Edited February 2, 2018 by Ibreakstuff Quote Link to comment Share on other sites More sharing options...
DaveT Posted February 2, 2018 Share Posted February 2, 2018 When the code is a tive, you don't need to connect anything. If it's intermittent, the memory connection will show those. Check the CTS. With an ohm meter, and the table in the fsm. It is the 2 wire sensor on the lower thermostat housing. Quote Link to comment Share on other sites More sharing options...
Subeast-EA81 Posted February 2, 2018 Share Posted February 2, 2018 if its running rough in the AM and hard starting, my guess from experience is the coolant temp sensor is not functioning correctly, (Code 21) therefore not telling the ECM to richen the mixture for a cold start condition (common failure). Hope this helps Quote Link to comment Share on other sites More sharing options...
Cyama Posted February 7, 2018 Author Share Posted February 7, 2018 Thank you! Quote Link to comment Share on other sites More sharing options...
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