P0688 Code - Electronic Control Module Power Relay Sense Circuit/Open

What does P0688 Mean?

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above. When you see P0688 engine fault code on your engine code reader this description will help you.

What are the common causes of P0688 ?

• The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
• Defective ECU strategies or components will prevent proper regeneration
• A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

How do you troubleshoot P0688 ?

Several repairs can fix a P0688 trouble code and include:

• Repair any loose or damaged battery cables
• Fully charge the battery
• Replace battery if needed
• Replace damaged or blown fuses
• Repair or replace damaged or corroded electrical wires and related connectors
• Repair loose or shorted connections
• Replace damaged or defective ECM/PCM relay
• Replace damaged or defective ECM
• Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

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