Originally Posted by bluefocussss
what could be causeing this problem, first the car wouldnt start but it was dripping fuel under the car. the car sat a few weeks till i changed the timing belt and when i went to start the car, it woldnt start unless i poured some fuel into the intake manifold then i would burn off that fuel then die, i checked the ecu and i got (P1237 Fuel Pump Secondary circuit fault ) what does this mean? any one help please. thanks.....
Here ya go:
P1237 - Fuel Pump Secondary Circuit Malfunction Note: For LS6/LS8, the FPDM functions are incorporated in the rear electronics module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be set through SCP.
Indicates that the FPDM has detected a fuel pump secondary circuit fault. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received. Open or shorted FP PWR circuit
Open FP RTN circuit to FPDM
Open or shorted circuit in the fuel pump
Locked fuel pump rotor
For LS6/LS8, circuits associated with the Fuel Pump relay
The FPDM sends a 75% duty cycle (750 msec ON, 250 msec 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 will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1237 stored in Continuous Memory.
The FPDM controls pump speed by supplying a "variable" ground on the RTN circuit.