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Old 12-14-2012, 08:35 PM   #11
BC_ZX3
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P1237 - Fuel Pump Secondary Circuit Malfunction
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.
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
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.

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Old 12-14-2012, 09:06 PM   #12
H8VTEC
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Ok so to break down....
Causes:
Open or shorted FP PWR circuit
bad fuse, relay, inertia switch?
Open FP RTN circuit to FPDM
this is the wires from the fuel pump to the FPDM?
Locked fuel pump rotor
Would the pump kick on if its locked? Would I get fuel pressure?
Damaged FPDM
Self explanatory.
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Old 12-14-2012, 10:52 PM   #13
sailor
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To simplify from the description & diagram, the two wires from the "Driver module" under the rear seat to the fuel pump - one power, one variable ground - either not functional to the pump is ONE failure mode.

The other failure mode is a bad fuel pump - wiring fault internally, or mechanically frozen.

So - If you go by the color codes & where the wires actually go, you can test for a continuous circuit right from the plug to the driver module under the rear seat. No continuity (ohm meter), either the wiring is damaged or the fuel pump is "fried".

If you have continuity, momentary application of 12v. power to those wires & the pump should run, if it doesn't it's "locked up" aka "frozen". and No - if it's locked up it won't work, so it won't pump anything...

luck!
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Old 12-14-2012, 11:12 PM   #14
H8VTEC
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Quote:
Originally Posted by sailor View Post
To simplify from the description & diagram, the two wires from the "Driver module" under the rear seat to the fuel pump - one power, one variable ground - either not functional to the pump is ONE failure mode.

The other failure mode is a bad fuel pump - wiring fault internally, or mechanically frozen.

So - If you go by the color codes & where the wires actually go, you can test for a continuous circuit right from the plug to the driver module under the rear seat. No continuity (ohm meter), either the wiring is damaged or the fuel pump is "fried".

If you have continuity, momentary application of 12v. power to those wires & the pump should run, if it doesn't it's "locked up" aka "frozen". and No - if it's locked up it won't work, so it won't pump anything...

luck!
Ok, so the pump being bad is out of the question then. I hear it come on and I'm getting 40PSI when the key is in the ON position.
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Old 12-28-2012, 06:15 PM   #15
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Ok, the pump is getting power. I checked the connector with an ohmmeter. I also disconnected the fuel line on the fuel rail and i see fuel spitting out of the line. I'm guessing its going to be the FPDM.
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