P0704 Code - Clutch Switch Input Circuit Malfunction

What does P0704 Mean?

When the clutch pedal is depress the voltage signal from the clutch switch to the Engine Control Module (ECM) is low. If the ECM does not see this change from high to low when the vehicle is over 0 mph, the ECM sets code P0704.

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What are the common causes of P0704 ?

The most common causes of this type of malfunction code being stored are due to a defective or misadjusted clutch input switch. Other possible causes include shorted, open, or corroded wiring and/or electrical connectors.



How do you troubleshoot P0704 ?

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

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