When diagnosing Infiniti Code P1564, which stands for ASCD Steering Switch Malfunction (Includes Hybrid Models), understanding the root causes and potential solutions to this complex issue is key. This malfunction is particularly concerning for hybrid models, as it involves the high-voltage battery system and requires a high degree of caution when working on it. The MIL will not illuminate this self-diagnosis, and it is important to note that if DTC P1564 is displayed with DTC P0605, the first step should be to diagnose the trouble for DTC P0605. An excessively high voltage signal from the ASCD steering switch is sent to the ECM, and the ECM detects that the input signal from the ASCD steering switch is out of the specified range.
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Causes and Solutions of Infiniti Code P1564
| Causes | Solutions |
|---|---|
| Harness or connectors | Check all the wiring, connectors, and ASCD switch circuits for open or short courses. |
| ASCD steering switch | Replace the faulty switch to restore the proper functioning of the system. |
| ECM | After confirming that the ASCD switch is not the issue, replace the ECM. |
| Excessively high voltage signal | Check the wiring and connectors of the ECM and the ASCD switch. |
Harness or Connectors
One of the primary causes of Infiniti Code P1564 is an issue with the harness or connectors, which can lead to an open or shorted circuit in the ASCD switch circuit. To resolve this issue, it is important to check all the wiring, connectors, and the ASCD switch circuit for any open or short circuits.
ASCD Steering Switch
The ASCD steering switch is one of the most common causes of Infiniti Code P1564. If the switch is faulty, it can cause an excessively high voltage signal to be sent to the ECM, which will trigger the code. The best solution to this issue is to replace the faulty switch to restore the proper functioning of the system.
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ECM
The ECM can also cause Infiniti Code P1564, as it is responsible for detecting the input signal from the ASCD switch and determining whether or not it is within the specified range. If the ECM is the cause of the code, then it must be replaced to resolve the issue. However, it is important to confirm that the ASCD switch is not the issue before replacing the ECM.
Excessively High Voltage Signal
If the ECM is detecting an excessively high voltage signal from the ASCD switch, then it is important to check the wiring and connectors of the ECM and the ASCD switch. If any of these components are damaged or faulty, then they must be replaced to restore the proper functioning of the system.
Conclusion: Taking the Necessary Precautions When Diagnosing Infiniti Code P1564
Infiniti Code P1564 can be a complex issue to diagnose, and it is important to take the necessary precautions. The most common causes of this code are harness or connector issues, a faulty ASCD steering switch, and an issue with the ECM. To resolve the problem, it is important to check all the wiring, connectors, and components for any open or short circuits and replace any damaged parts. Taking the necessary precautions and understanding the root causes of Infiniti Code P1564 is key to successfully diagnosing and resolving the issue. Infiniti Code P1564 should not be taken lightly, and all necessary steps should be taken to ensure a successful diagnosis and resolution.
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