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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - TBI >> Diagnostic Tests >> Code 54: Fuel Pump Circuit (Except 3.1L)

Code 54: Fuel Pump Circuit (Except 3.1L)

Code 54 will set if the ECM does not see 12 volts on the fuel pump signal voltage monitor during the first 2 seconds after ignition is turned on.

Fig 1: Code 54: Fuel Pump Circuit/Circuit Diagram ("S", "T" & "M" Series)
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Fig 2: Code 54: Fuel Pump Circuit/Circuit Diagram (All Other Models)
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Fig 3: Code 54: Fuel Pump Circuit Flow Chart
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