The P0654: Engine RPM Output Circuit Malfunction code refers to an issue with the circuit responsible for reporting the engine’s RPM (Revolutions Per Minute). This could be caused by a malfunction in the RPM output circuit, wiring issues, or a faulty RPM sensor. It can result in incorrect engine RPM readings or improper engine performance.
P0654 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0654: Engine RPM Output Circuit Malfunction |
| Is it serious? | Yes, as it can affect RPM readings, engine control, and potentially vehicle performance. |
| Possible causes | – Faulty engine RPM output circuit – Wiring issue – Faulty RPM sensor |
| How to diagnose? | – Test engine RPM output circuit – Inspect wiring and connectors – Replace RPM sensor or circuit if necessary |
P0654 Meaning
The P0654 code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a malfunction in the RPM output circuit, which is responsible for transmitting engine speed information to the vehicle’s systems. A malfunction in this circuit can cause inaccurate RPM readings, affecting engine control and performance.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the engine RPM system or sensor issues. These may help identify the problem. | OBD-II Scanner |
| Test the Engine RPM Output Circuit | Use a multimeter to test the RPM output circuit to ensure it is sending the correct signal and voltage to the control module. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors associated with the engine RPM output circuit for damage, loose connections, or corrosion. | Flashlight, Multimeter |
| Test the RPM Sensor | Test the RPM sensor to verify that it is providing accurate engine speed data to the control module. Replace if it is faulty. | Diagnostic Tool, Multimeter |
| Replace the RPM Sensor or Circuit if Necessary | If the RPM sensor or output circuit is malfunctioning, replace it to ensure accurate engine speed readings. | Replacement Sensor/Circuit, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure the RPM sensor and circuit are functioning properly. | OBD-II Scanner, Vehicle Manual |
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)