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CEL - 1237?? #1531571 03/21/06 01:34 PM
Joined: Feb 2005 Posts: 72 MI M mdillian3690 OP CEG\'er
OP mdillian3690 CEG\'er M Joined: Feb 2005 Posts: 72 MI	Fuel Pump Secondary Circuit Malfunction? Can anyone tell me what this is? This is the second time I have received this CEL? Called the dealer and they wouldn't tell me anything. They said for $90 we can probably figure it out.

Re: CEL - 1237?? #1531572 03/21/06 02:12 PM
Joined: Sep 2002 Posts: 1,788 St. Louis, MO P projectSHO89_dup1 Hard-core CEG\'er
projectSHO89_dup1 Hard-core CEG\'er P Joined: Sep 2002 Posts: 1,788 St. Louis, MO	Quote: Diagnostic Trouble Code (DTC) P1237 or P1238 indicate that the Fuel Pump Driver Module (FPDM) has detected a fuel pump secondary circuit fault. This is due to either an intermittent or hard fault concern. This DTC is set when the PCM receives a 75% duty cycle signal from the FPDM on the FPM circuit. The only difference between the DTC P1237 and P1238 is that the P1237 is an MIL DTC. Possible causes: -- Open or shorted FP PWR circuit. -- Open fuel pump ground circuit to FPDM. -- Open or shorted circuit in fuel pump. -- Locked fuel pump rotor. -- Damaged FPDM. l Is DTC P1237 or P1238 present in Key On Engine Off or Key On Engine Running Self-Test? Yes A hard fault is present. GO to �?«KB48�?». No DTC P1237 or P1238 is intermittent. GO to �?«KB57�?». Please specify the year and engine.... we are not psychic. Steve 98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!

Re: CEL - 1237?? #1531573 03/21/06 02:14 PM
Joined: Feb 2005 Posts: 72 MI M mdillian3690 OP CEG\'er
OP mdillian3690 CEG\'er M Joined: Feb 2005 Posts: 72 MI	The year is 1999 Mystique 2.5L build date 7/99 Returnless. I just found this on another website. A guy at work jump the two grounds at the connection of the fuel pump, must have shorted something? Okay, here ya go. This is straight from a web forum for professional technicians called iATN. It is a subscription-only site. P1237=Fuel Pump Secondary Circuit (Fuel Pump Driver Module) Electronic Returnless Fuel Systems (ERFS) utilize a Fuel Pump Driver Module (FPDM) to control fuel pressure. The PCM uses a Fuel Rail Pressure Sensor (FRP) for feedback. The PCM outputs a duty cycle to the FPDM to maintain the desired fuel rail pressure. During normal operation, the PCM will output a FP duty cycle from 5% to 51%. The FPDM will run the fuel pump at twice this duty cycle, e.g. if the PCM outputs a 42% duty cycle, the FPDM will run the fuel pump at 84%. If the PCM outputs a 75% duty cycle, the FPDM will turn off the fuel pump. If the FPDM does not out any diagnostic signal, (0 or 100% duty cycle), the PCM sets a P1233 DTC. This DTC is set if the FPDM loses power. This can also occur if the Inertia Fuel Switch is tripped. If the FPDM outputs a 25% duty cycle, it means that the fuel pump control duty cycle is out of range. This may occurs if the FPDM does not receive a valid control duty cycle signal from the PCM. The FPDM will default to 100% duty cycle on the fuel pump control output. The PCM sets a P1235 DTC. If the FPDM outputs a 75% duty cycle, it means that the FPDM has detected an open or short on the fuel pump control circuit. The PCM sets a P1237 DTC.

Re: CEL - 1237?? #1531574 03/21/06 02:18 PM
Joined: Feb 2005 Posts: 72 MI M mdillian3690 OP CEG\'er
OP mdillian3690 CEG\'er M Joined: Feb 2005 Posts: 72 MI	Originally posted by projectSHO89: [qiote] Diagnostic Trouble Code (DTC) P1237 or P1238 indicate that the Fuel Pump Driver Module (FPDM) has detected a fuel pump secondary circuit fault. This is due to either an intermittent or hard fault concern. This DTC is set when the PCM receives a 75% duty cycle signal from the FPDM on the FPM circuit. The only difference between the DTC P1237 and P1238 is that the P1237 is an MIL DTC. Possible causes: -- Open or shorted FP PWR circuit. -- Open fuel pump ground circuit to FPDM. -- Open or shorted circuit in fuel pump. -- Locked fuel pump rotor. -- Damaged FPDM. l Is DTC P1237 or P1238 present in Key On Engine Off or Key On Engine Running Self-Test? Yes A hard fault is present. GO to �?«KB48�?». No DTC P1237 or P1238 is intermittent. GO to �?«KB57�?». Please specify the year and engine.... we are not psychic. Steve Steve, Not sure, while to car was running I hooked up the OBDII & noticed the code. The Check Engine light has been on for about 3 days. Also, what do you mean "Go to KB48"? Thanks!

Re: CEL - 1237?? #1531575 03/21/06 02:27 PM
Joined: Sep 2002 Posts: 1,788 St. Louis, MO P projectSHO89_dup1 Hard-core CEG\'er
projectSHO89_dup1 Hard-core CEG\'er P Joined: Sep 2002 Posts: 1,788 St. Louis, MO	That's a reference to the next diagnostic procedure step. My cut'n paste is from the diagnostic routine from the factory Service CD. Steve 98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!

Re: CEL - 1237?? #1531576 03/21/06 02:31 PM
Joined: Feb 2005 Posts: 72 MI M mdillian3690 OP CEG\'er
OP mdillian3690 CEG\'er M Joined: Feb 2005 Posts: 72 MI	Originally posted by projectSHO89: That's a reference to the next diagnostic procedure step. My cut'n paste is from the diagnostic routine from the factory Service CD. Steve Steve, Do you think the connector to the two grounds is causing a short? "A guy at work jump the two grounds at the connection of the fuel pump, must have shorted something? ". I will say this, my fuel pump in the on position is always priming, never stops?

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