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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1069 (Engine Controls Diagnosis - 4.8L, 5.3L, & 6.0L (DTCS P2120 To U0107)) >> Diagnosis >> DTC P2636 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The secondary fuel pump is located in the rear fuel tank. The secondary fuel pump is powered by a secondary fuel pump relay. Fuel is transferred from the rear fuel tank to the front fuel tank in order to ensure all of the usable fuel volume is available to the primary fuel pump. The secondary fuel pump relay supply voltage is received from the primary fuel pump relay when the primary fuel pump is energized. The secondary fuel pump relay ground is controlled by the powertrain control module (PCM). The secondary fuel pump diagnostic runs only at idle. If the PCM commands the secondary fuel pump ON and a predetermined change in both the front and rear fuel level sensors does not occur, DTC P2636 sets.

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