How to Retrieve Mazda Codes OBD1 and Definitions

How to retrieve and decode Mazda pre 1995 OBD system trouble codes.

Step 1 - Start the engine and allow to warm up to operating temperature, then turn the engine "OFF".

start engine
Start Engine

Step 2 - Next, install a jumper wire from the TEN terminal to the GND terminal, located either under the dash or hood depending on model.

gen1 mazda connector
ALDL Connector

Step 3 - After the jumper wire has been installed, turn the ignition key to the "ON" position.

turn key on
Turn Ignition Key "ON"

Step 4 - The check engine light will start to blink, count the number, this will be the first number of the two digit trouble code. For example, if the light blinks two times and then pauses, the first number of the code is 2. After the check engine light pauses, the start of the second digit generation has begun. For example, if the second set of blinks equals eight, the trouble code digit will be 8, together with the first digit the code will be 28. Because one or more codes can be stored in the computer system allow the code gathering to continue until it repeats.

Step 5 - To clear trouble codes after repairs have been made, disconnect the negative battery cable, then reconnect after two minutes.

disconnect battery
Disconnect Negative Battery Cable

Helpful Information

The OBD1 operating system is the first system adopted to the automobile industry which marked the beginning of the automotive computer revolution. This system is able to detect malfunctions in the operating system and store trouble codes in memory. Once the code or codes are in the memory the retrieval method must be used for diagnostic repairs. Cars built after 1995 are equipped with the OBD11 system which is more complex.

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 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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