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
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.
ALDL Connector
Step 3 - After the jumper wire has been installed, turn the ignition key to the "ON" position.
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 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
Questions?
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Article published 2022-03-10