Code Reader?

Grim Myth · Post by **Grim Myth** » January 23rd, 2002, 9:19 am

I have seen allot of posts here that give the codes and reference a code reader that mazda makes. I called my local dealer and they said they wouldn't sell me one. It appears that the Ford code reader will work ($20) is this true? Or is the only way to read this to hook a o'scope up to it? I have a 92 MX-3 with 1.8L.Grim

David Coleman · Post by **David Coleman** » January 23rd, 2002, 12:03 pm

Locate and open the "Diagnostic" box under the hood. It's by the firewall. Below is shown a representation of the pins inside the Diagnostic box:

The pins labelled "TEN" (which stands for "Test ENgine" by the way) and GND (ground) are the pins of interest. Make sure the ignition is OFF and use a paperclip to jumper the TEN and GND pins together.Turn on the ignition (do not start the car) and watch the CEL. After about 4-seconds, it will begin to flash any codes that may be stored. If there are no codes stored, the CEL will not flash (it will go out.)Malfunction codes are generally 2-digit affairs although Mazda decided to get tricky. They include 2-digit codes that involve '0' (zero) as a digit. Code 02 is one example. Code 10 is another.The codes are broken into a 10s digit and a 1s digit. The 10s digit is flashed first, followed by the 1s digit. The digits are distinguished by the length of time they flash the CEL. 10s digits flash the CEL on for 1.2-sec while 1s digits flash the CEL for 0.4-sec. Digits that are '0' (zero) flash the CEL exactly zero times.The diagram below illustrates graphically how two typical malfunction codes might be flashed out.

Note how the presumably single-digit code '3' flashes the CEL for short-pulses only. This indicates the 10s digit is zero for this code.List of codes and what they correspond to:<UL TYPE=SQUARE><LI>02 'NE2' crankshaft position sensor <LI>03 'G' camshaft position sensor <LI>04 'NE1' camshaft/crankshaft position <LI>sensor <LI>05 Knock sensor <LI>08 Volume Air Flow sensor (VAF) <LI>09 Coolant temperature sensor (CTS) <LI>10 Intake air temperature sensor (IAT) <LI>12 Throttle position sensor (TPS) <LI>14 Barometric pressure sensor <LI>15 LHO2S inactivation error <LI>16 Exhaust gas recirculation (EGR) system <LI>17 LHO2S inversion error <LI>23 RHO2S inactivation error <LI>24 RHO2S inversion error <LI>25 Fuel pressure regulator control solenoid <LI>26 Canister purge solenoid <LI>28 EGR vacuum solenoid <LI>29 EGR vent solenoid <LI>34 Idle air control (IAC) solenoid <LI>41 VRIS #1 solenoid <LI>46 VRIS #2 solenoid </UL>Search key words: malf code, pulling codes, CEL, EGR, Check engine light, malfunction code.

Grim Myth · Post by **Grim Myth** » January 28th, 2002, 12:52 pm

Ok I checked for codes. My light just goes out after 4 seconds no codes. I still can't get the engine to run. I replaced the coil, it ohmed out under 15k. My spark still seems weak.I am getting fuel and my timing belt is ok (I replaced it when I opened it up I am at 67k miles). Could this be the ignighter (I think thats the name)? Is that the capacitor that is attached to the side of the distributer?Could It actually be the ECU? How can this be tested? If I pull off the connector for the coil shouldn't I get a fault flashed on my CEL?The car originally stopped running when my wife was backing up it just died and has not run since. Grim

BATTOSAI · Post by **BATTOSAI** » September 27th, 2002, 3:38 pm

I found that post and I ´don´t know where is the CEL on the console. I have a 92 Gs, and no information on the booklet is shown, If i do the bridge between the Ten-GNd , Will it Appear?

mfides · Post by **mfides** » September 27th, 2002, 4:27 pm

European MX-3 don't have a check engine light. You can wire the HOLD light to it if you have a manual. You need to install the bulb too.

A quicker way is to attach a small (1W or less) bulb or a LED to the diag pin in the diag conn. See the probefaq link in David Coleman signature. (section "reading codes in pre-OBDII")

Mike 94PGT · Post by **Mike 94PGT** » September 27th, 2002, 6:11 pm

<BLOCKQUOTE>quote:<HR>Originally posted by David Coleman: [QB]Locate and open the "Diagnostic" box under the hood. It's by the firewall. Below is shown a representation of the pins inside the Diagnostic box:

BATTOSAI · Post by **BATTOSAI** » October 3rd, 2002, 4:36 pm

Hola Miguel!! Where should I connect the hold light to use it as a CEL? (Soy Xavi)

David Coleman · Post by **David Coleman** » October 3rd, 2002, 6:09 pm

<BLOCKQUOTE>quote:<HR>Originally posted by Mike 94PGT: You're welcome

<HR></BLOCKQUOTE> Crap, I didnt credit you for that. Sorry Mike. I know I did in the <A HREF="http://www.mx-3.com/cgi-bin/ultimatebb. ... 3&t=000005" TARGET=_blank>V6 FAQ post</A> though

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