Possible Causes:
Open or shorted FP PWR circuit.
Open FP RTN circuit to FPDM.
Open or shorted circuit in the fuel pump.
Locked fuel pump rotor.
Damaged FPDM.
Possible Solution
The FPDM sends a 75% duty cycle (750 ms ON, 250 ms OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PCM returns to sending an all OK (50% duty cycle) message to the PCM.
The FPDM controls pump speed by supplying a variable ground on the RTN circuit.
I would take it to the dealer if you still can
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SOLD S197 GT350 TRIBUTE.
2008 SHELBY GT500 built 4/21/2008 #6097 / 6513 COUPES: #807 / 869 in VISTA BLUE
VISTA BLUE WITH WHITE STRIPES
SHAKER 1000 WITH SIRIUS SAT
HID LIGHTS
GT500 SIGNED DASH PLAQUE AND SILLS
FRPP CAI FRPP BORLA STINGERS
2.6 pulley and 90mm idler
custom tuned by VMP tuning 544rwhp/547 torque
NOT AS FAST AS SOME, BUT NOT AS SLOW AS SOME THINK!!
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P1237 Fuel Pump Secondary Circuit Malfunction?
