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 FAQ: Check Engine Light codes 
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Joined: November 07 2000, 3:01 AM
Posts: 2516
Location: Gainesville, FL USA
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Post FAQ: Check Engine Light codes
This is from Mike P's site. He rules.

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:

http://home.golden.net/~trinity/malf/diag21.gif - IMAGE NOT AVAILABLE

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.

http://home.golden.net/~trinity/malf/celflsh.gif - IMAGE NOT AVAILABLE

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:

    02 'NE2' crankshaft position sensor
    03 'G' camshaft position sensor
    04 'NE1' camshaft/crankshaft position sensor
    05 Knock sensor
    08 Volume Air Flow sensor (VAF)
    09 Coolant temperature sensor (CTS)
    10 Intake air temperature sensor (IAT)
    12 Throttle position sensor (TPS)
    14 Barometric pressure sensor
    15 LHO2S inactivation error
    16 Exhaust gas recirculation (EGR) system
    17 LHO2S inversion error
    23 RHO2S inactivation error
    24 RHO2S inversion error
    25 Fuel pressure regulator control solenoid
    26 Canister purge solenoid
    28 EGR vacuum solenoid
    29 EGR vent solenoid
    34 Idle air control (IAC) solenoid
    41 VRIS #1 solenoid
    46 VRIS #2 solenoid


Search key words: malf code, pulling codes, CEL, EGR, Check engine light, malfunction code.

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David Coleman
I used to know alot about MX-3's, but not so much anymore. Oh well.


March 12 2002, 1:47 AM
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Joined: November 07 2000, 3:01 AM
Posts: 2516
Location: Gainesville, FL USA
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Post Re: FAQ: Check Engine Light codes
Moved to the new V6 FAQ!

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David Coleman
I used to know alot about MX-3's, but not so much anymore. Oh well.


April 07 2002, 6:34 PM
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Joined: April 11 2001, 2:01 AM
Posts: 199
Location: Phoenix, AZ
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Post Re: FAQ: Check Engine Light codes
Here are the actual code pages from the shop manual, giving the code number, pulse sequence, related sub-system and diagnostic information:

PAGE 1

PAGE 2

(Above links are broken, please use the MX-3.com Online Shop Manual for more details.)

[ April 21, 2002: Message edited by: mazdamaniac ]

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April 21 2002, 7:00 PM
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Post FAQ: Check Engine Light codes
Also, I'd like to thank Mike P for all the information in the original post.

Mike's site

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David Coleman
I used to know alot about MX-3's, but not so much anymore. Oh well.


November 05 2002, 6:18 PM
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Joined: August 13 2001, 2:01 AM
Posts: 4476
Location: Atlanta, GA.
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Post Re: FAQ: Check Engine Light codes
The pages of the Shop Manual that have the codes listed are- F2-077 and F2-078 for the 1992 manual and F2-074 and F2-075 for the 1995 manual.
Links-
For the 1992 Shop Manual.
F2-077
http://www.mx-3.com/manuals/showimg.php?file=/1992%20Workshop%20Manual/F2/92_F2-077.gif
F2-078
http://www.mx-3.com/manuals/showimg.php?file=/1992%20Workshop%20Manual/F2/92_F2-078.gif
For the 1995 Shop Manual
F2-074
http://www.mx-3.com/manuals/showimg.php?file=/1995%20Workshop%20Manual/F2/F2-074.gif
F2-075
http://www.mx-3.com/manuals/showimg.php?file=/1995%20Workshop%20Manual/F2/F2-075.gif
Enjoy and good luck if you are reading this something is FUBAR. ;)

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March 12 2008, 4:48 PM
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