Mazda Trouble Codes OBD1

The OBD1 operating system is the first system adopted into the automobile industry and marked the start of the computer revolution in the auto industry. This system is able to detect malfunctions in the computer system and store that code in its memory. Once the code or codes are in the memory the retrieval system must be used to gather the codes for diagnostic repairs. Cars built 1995 and earlier have this system, anything made after the year 1995 is equipped with the OBD11 system which is different and more complex to retrieve trouble codes from. To gather trouble codes from the ODB1 computer system warm the engine up to operating temperature and then turn the ignition "off". Next install a jumper wire from the "TEN" terminal to the "GND" terminal. 

Then, turn the ignition key to the "on" position. You will observe the "check engine" light starting to blink, count the number of times the light blinks and that will be the first number of the trouble code. For example if the light blinks two times the first number of the code will be 2. Then the check engine light will pause this is the break letting you know the second part of the code is coming. Count the second set of check engine light blinks this will be the second digit in the code identification. For example if the second set of blinks equals eight the trouble code digit will be 8. Together with the first code digit the total code number will be 28. Allow the code gathering to continue because one or more codes can be stored in the computer system. To clear trouble codes after the codes have been retrieved disconnect the negative battery cable, and then reconnect it after two minutes.

Mazda Code and Data Connector
Mazda Code and Data Connector (Three options)

Mazda ODB1 Trouble Code Definitions

02 Crank Position Sensor (NE Signal)

03 Cam Position Sensor (SGC Signal)

05 Knock Sensor

08 Air Flow Sensor

09 Engine Coolant Temperature Sensor

10 Intake Air Temp. Sensor (Air Flow Sensor)

12 Throttle Position Sensor

14 Barometric Absolute Press. Sensor

15 and/or 23 Heated Oxygen Sensor (Inactivation)

16 EGR Function Sensor

25 Pressure Regulator Control Solenoid Valve

26 Purge Control Solenoid Valve

28 EGR Vacuum Solenoid Valve

29 EGR Vent Solenoid Valve

34 Idle Air Control Valve

41 VRIS 1 Solenoid Valve

46 VRIS 2 Solenoid Valve

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35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2013-08-16)