Driving a Mazda with a code P1521 can be a frustrating experience. This code is an indication of a malfunction in the Variable Reduction Intake Solenoid (VRIS) 1 circuit, which can cause a range of problems with the vehicle. This code can cause the engine to idle roughly, the car to stall, or reduced engine power. To help drivers diagnose and address this issue, this article will provide a comprehensive overview of the causes and solutions to the Mazda code P1521.
Causes and Solutions of Mazda Code P1521
| Causes | Solutions |
|---|---|
| VRIS control circuit is open or shorted to ground | Open the circuit and check for any wiring or electrical problems. |
| VRIS power circuit is open (the fuse may be blow) | Replace the fuse and check the power circuit. |
| VRIS is damaged or has failed | Replace the VRIS with a new one. |
| PCM has failed | Replace the PCM with a new one. |
Open Circuit and Short to Ground
If the Mazda code P1521 is caused by an open or shorted circuit, the first step is to open the circuit and check for any wiring or electrical problems. If the circuit is open, the source of the problem must be identified and then repaired. If the circuit is shorted to ground, it must be disconnected from the ground and the wiring must be checked for any damage or corrosion.
VRIS Power Circuit
If the Mazda code P1521 is caused by a malfunctioning VRIS power circuit, the first step is to replace the fuse and check the power circuit. If the fuse is blown, it must be replaced and the circuit must be tested to ensure that the power is coming from the correct source.
Damaged or Failed VRIS
If the Mazda code P1521 is caused by a damaged or failed VRIS, the only solution is to replace the VRIS with a new one. When replacing the VRIS, it is important to ensure that the new VRIS is compatible with the vehicle and is properly installed.
Failed PCM
If the Mazda code P1521 is caused by a failed PCM, the only solution is to replace the PCM with a new one. When replacing the PCM, it is important to ensure that the new PCM is compatible with the vehicle and is properly installed.
Conclusion
The Mazda code P1521 can be caused by a range of issues, including an open or shorted VRIS control circuit, a malfunctioning VRIS power circuit, a damaged or failed VRIS, and a failed PCM. To address these issues, drivers must open the circuit and check for any wiring or electrical problems, replace the fuse and check the power circuit, replace the VRIS with a new one, and replace the PCM with a new one. To ensure that these repairs are successful, drivers should always use genuine Mazda parts for their vehicles.
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