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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 167 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0650 To DTC P3436 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1255: Fuel Pump Control Module Driver Overtemperature (LF4) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM) provides a fuel pump enable signal to the fuel pump driver control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump driver module remains active for 2 s, unless the engine is in crank or run. While this voltage is being received, the fuel pump driver module supplies a varying voltage to the fuel tank fuel pump module in order to maintain the desired fuel pressure.

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