Injection fault memory

Failure and short-term malfunctions of the sensors are recorded in the fault memory of the control unit. Recorded faults can be read out in workshops using a special MAZDA self-diagnosis device (SST 49H0189A1). The fault code provides information on where in the ignition or injection system the fault should be looked for. A detailed test catalog is required to determine a specific fault. In addition, most checks require the use of special tools that are usually not available in a home workshop kit. Therefore, only some general guidelines for testing are given here. A detailed check must be carried out in a specialist workshop.

General instructions for testing

Attention! If the self-diagnostic tool has detected a malfunction, for example, the coolant temperature sensor, the malfunction may also be inside the control device. The malfunction can be determined either by replacing the sensor, or by further detailed checking using special instruments (performed in the workshop).

Note. Workshops do not accept returns of purchased but unused parts.

1. Disconnect the cables, check the reliability of the connections, remove corrosion.

2. Check cable fastening.

3. Check the resistance of the defective part and compare with the required value.

4. Check the wires to the control device for current flow using an ohmmeter

Attention! When the battery is disconnected, faults in the memory of the control unit are erased. If the same malfunctions appear during further operation, they are again recorded in the memory.