How to check for “Codes” on a 1990-1995 Mazda MX-5 Miata.
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- Опубликовано: 5 окт 2024
- This video shows you how to check for diagnostic trouble codes / engine fault codes on pre-OBD2 Mazda MX-5 Miata and Eunos Roadster (1990-1995).
If your Miata has a code stored in its ECU / Engine Control Unit / Computer, the engine light or “MIL” Malfunction Indicator Light will flash.
For single digit codes: It will flash quickly. The number of flashes is your code number.
For two digit codes: It will flash and stay on for aprox 2 seconds, followed by a series of quick flashes.
Here is what the flash codes mean:
1990-1993:
1 Ignition pulse (no igf signal).
2 No Ne signal.
3 No G signal.
8 Airflow meter.
9 Water thermistor / coolant temperature sensor. .
10 Intake air thermistor in airflow meter.
12 Throttle position sensor open or short circuit.
14 Atmospheric pressure sensor (inside the ECU).
15 Oxygen sensor.
17 Oxygen sensor.
26 Purge solenoid valve (Evap canister purge valve).
35 ISC valve.
1994-1995:
1 IGF signal.
3 SGT signal.
4 SGC signal.
8 Mass airflow sensor.
9 Coolant temp sensor.
10 Intake air temp sensor.
12 Throttle position sensor.
14 Atmospheric pressure sensor (inside the ECU).
15 Oxygen sensor.
16 EGR function sensor.
17 Oxygen sensor.
25 PRC solenoid valve.
26 Purge solenoid valve (Evap canister purge valve).
28 EGR solenoid valve (vacuum).
29 EGR solenoid valve (vent).
34 ISC valve.
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Disclaimer:
Due to factors beyond the control of MiataMan, I cannot guarantee against improper use or unauthorized modifications of this information. MiataMan assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. MiataMan recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of MiataMan, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not MiataMan. 
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On the side of the road running on 3 cilinders watching this
sitting in my car with no spark after tow watching this😂
Jeremy Clarkson vibes
Just threw timing ma boy 😂😂
I own a 1991 Miata just like yours, mine 102.000 miles, bought it in April 2019 with 94.000 miles. I love this car!
Thanks. Our 1992 has been so trouble free that I have never had to look for codes.
congrats man! total opposite here :(
Much appreciated. Did a head gasket job and took out my EGR. Got a check engine light and this confirmed my suspicions. Thank you!
My 91 Mazda 626 doesn't have that, in fact I couldn't find an OBD1 port at all anywhere.
Really enjoying your content at the moment, keep it up man.
Thanks 🙏 😃
Great content, I subscribed today! I have a 1994 Miata with the "R Package" 4,200 original miles. I'm the original owner and just retired. I'm going to start enjoying this little baby now. Great content, keep up the great job.
Based Miata Man, saving Miata's. God Speed, you magnificent hero
Yes I have a showroom Miata 1990 with 99,000 miles.I really like this super cool car.I like it better then my 350 Z
You have an 1991 Escort Gt owner as a subscriber. Thank you. Getting it back to like new, or as close as possible.
This is great. Just picked up a 1990 NA. My current car is a 1996 with OBD
HOWdy M-M,
thanks for the LIST of CODES
1993 "NA" MIATA Automatic Transmission
COOP
...
Happy New Year Miata Man. The video where you changed the ignition lock switch helped me out a ton the chisel method worked great! Thanks.
Happy new year 🥳
Glad it helped 👍
Thanks for the positive feedback 😃
Careful doing this. Paperclip burnt through the plastic of my diagnostic port 😂
I’ve never seen that happen before.
My code was 8 for AFM but i was wondering will it show one code at a time or whatever the sequence is, is just that one code only? Great video btw!
Thank you Peter to help me make my dream comes true.🙂
Happy New Year 2021. Best Miata info yet thank you!
I have a JDM 1.8 1994 and I did exactly what you showed in the video but no lights are flashing for me. I do have a heat sensor light on and the CAT has been replaced as the old one was finished but light is still on?
Very cool, thanks! Happy New Year!
I have a 91 Miata and my plug connected (connected to the center of the engine bay right above the motor to the slight left) it tore and ever since then I have gotten the one long light then 5 flashes. Having some real trouble depinning the plug since it’s not the same as every other one and I feel like CEL is on due to the plug being ripped (tore literally from the neck of the wire so redoing it is hard)
🖒happy New Year and stay safe, thanks for the good tips!!!
Hi miata man, believe I’ve blown a fuse as there’s now no lights on the dash. Any idea which fuse it’s likely to be?
Does it mean that I have a code when it’s just on solid?
Yes 👍
I’m having a crank no start after pulling engine and doing a seal kit , I bought a new air flow meter after breaking mine and the code my car is sending is “18” as in 1 solid flash for 2 seconds then 8 quick flashes??? Any ideas ?
Two things that come to mind right away are ignition switch or clutch switch.
my engine light just came back on solid and didn’t flash or turn off. good video still though!
You can clear the codes by disconnecting the battery for 10min.
Mine does the same thing?
My 94 1.8l it just was on it never went off what does that mean? Is that all of them? Do I have all the codes?
The codes should still be in the system
Hey Miata Man, my 1.8 na miata sometimes engine starts with ticking noise but as it warm up, the noise disappear, Is there any problems with the ticking noise?
It’s your hydraulic lifters (HLA’s) that are ticking. When the oil is low or dirty the noise will be louder.
You may want to consider doing an engine flush next time you change your oil. It will hopefully clean up the HLA’s and reduce the noise on start up.
Okay so I’ve got a 90 miata and it flashes 5 times. Is there another code for that or do I have to get a scanner
I am not sure what 5 flashes signifies.
Could it be one long and four quick flashes (meaning code 14)?
I'm getting error code 1 IGF signal and 26 Purge solenoid valve (Evap canister purge valve). I can't find much info online on the IGF signal error. Can you tell me what I need to replace or how to fix? 1994 Miata, thanks
The IGF signal code could mean that your igniter is going bad. It’s labeled “Power TR module” and resides on the right side of the engine bay next to the purge valve.
It may also point to a failing crank angle sensor or “CAS”.
@@MiataMandude your videos and even comments are so helpful, I almost don’t even need to ask based off scrolling through. This is great information! 🤝
Mine only shows 26, but it's always shown that code because I deleted the EVAP can. It's cranking but not Starting I'm losing my mind trying to figure it out
Have you checked the following:
-Fuel pump.
-Main relay (Fuel Inj) in the engine bay fuse box.
-Crank Angle Sensor.
My problem now 😭
Hi wonder if you have any ideas as why i mk1 is not running, cranks OK good fuel pressure, start but dies within a couple of seconds. Ciao Angelo
It could be a number of things.
Are you getting any codes?
Like a “no ig signal” code?
Here are a few ideas:
-Crank Angle Sensor (CAS).
-Mass Air Flow Meter (MAF).
-Ignition Coil Pack.
@@MiataMan No codes what so ever was working when parked it up 2 months ago
I noticed today fuel pump relay not energising when key in on or start position, if i bypass relay pump works with good pressure, could it be not getting signal from ECU ??
Will this tell me if my cam position sensor is the problem?
Not directly, but it could point you in the right direction.
What are your symptoms?
@@MiataMan it would idle rought on 2 cyl , so changed the coil pack it now starts great and runs smooth for about 3 seconds and dies
I have an 1990 miata i got codes 26 (purge valve solenoid) and i also got code 34, anyone know what code 34 is?
Most likely a bad ISCV.
Hello espero que se encuentren bien tengo un mazda miata pero no tengo pulso ni chispa me puedes ayudar por favor ?
How would I check an ABS light and Airbag light? Is it the same way?
You will need to get your hands on an OBD2 scanner that has capability to read AirBag and ABS codes.
Airbag works the same way for this method pre 96 cars
intresting, ok i have an earley 1.8 mx5 no engine light in dash, done the link and led setup, what i get is either 4 flashes or 14, im not sure, it lights up 1 long then another long, then 4 quick, so is it 4 or 14 or is it 1 and then 14 i looked up 4 flashes says it sgt signal, whats that? or if its 14 then atmospheric pressure sensor? now the complicated bit is, the engine is in a dutton kit car built by myself, so a lot of the engine loom was not connected, thimgs like power steering sensor, clutch pedal sensor, purge valve, there just the things i know the mx5 would of had, but not connected in my application. can u help lol... good video good details.
My car died in a cumbies parking lot with code 18. It’s not getting spark and I’m pretty sure it’s the ignitor but not 100% sure. Going to pick up a used one tomorrow.
It was a defective timing belt, luckily I had one on hand and was able to be back on the road after a couple hours
I have a 1990 Mazda Miata I have put a jdm 1.6 out of a nb Miata yes I know there supposed to have a 1.8 but japan changed them but it blinks 1 time then blinks 6 more
I can't get and spark, it turn over but no spark
Could be your crank angle sensor
Happy new year to you and your family. Any chance you could do a fuel filter replacement as I need to this soon. Many thanks.
Happy New Year Jason 🥳
It could be a while before I am able to do a fuel filter video, but I will see what I can do. All the best for the year ahead 👍
Does the Mazda MX-5 Miata have an obd2? and if yes where is located?
96 and up does, and underneath the driver side footwell tucked a little closer to the center stack side
Why does my Miata have no check engine light wtf
They all have a check engine light.
@@MiataMan no they dont
Is it possible it is 93 or earlier and did not have “california emmisions? I ask this because i dont have a check engine light on a 1993 mercedes 300e. I finally figured out the non california cars had no CEL and the california cars did. Not sure if this is true for miata.
how to read the codes? :)
My airbaglamp????
Any spark
does anyone know how to fix a code 10 for a 90-93
Try changing the Mass Air Flow Meter.
1987 Toyota TCCS is far more informative (more codes) compared to 1991 Mazda. Just saying