P1237 Fuel Pump Secondary Circuit Malfunction?
08-16-2009, 11:42 AM
#1
2nd Gear Member
Thread Starter
Join Date: Nov 2007
Posts: 201
P1237 Fuel Pump Secondary Circuit Malfunction?
Hey guys I got a P1237 Fuel Pump Secondary Circuit Malfunction code coming home from base. Should I be worried? Has anyone gotten this code and know how to fix it.
08-16-2009, 12:16 PM
#2
5th Gear Member
Join Date: Jul 2006
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Posts: 3,834
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
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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