P0686 Code- Engine Control Module Power Relay Control Circuit Low

What does P0686 Mean?

The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The Engine Control Module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an Output Driver Module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the ECM, and to several additional circuits.

engine code P0686	P0686 fix	obd P0686	dtc P0686
obd code P0686	obd2 P0686	P0686 car code	diagnostic code P0686
car code P0686	check engine code P0686	fehlercode P0686	P0686 fiat
codigo P0686	codigo falla P0686	P0686 kody b??dów	codigo de falla P0686

What are the common causes of P0686 ?

In choosing a single most common cause, I would have to say a faulty PCM relay. Other common causes may include a blown fuse, a bad fusible link, shorted or open circuits, a defective battery, faulty battery cables/cable ends, or a defective PCM.



How do you troubleshoot P0686 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0686 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

Searches related to P0686 - Engine Control Module Power Relay Control Circuit Low

• ecm/pcm power relay control circuit malfunction
• p0685 ecm pcm power relay control circuit open
• p0686 saab
• ecm pcm power relay control circuit high
• p0687
• saab 9 3 p0686
• saab 9-3 p0687
• ford focus fault code p0686