I have checked wiring from fuse panel all the way back to pump. It looks like a recent pump job was done. I've dropped the tank and extracted the pump. Pump is fine. I am having trouble figuring out what is shorting out my power in my main pump wire."which is pink"I have checked wiring from fuse panel all the way back to pump. It looks like a recent pump job was done. I've dropped the tank and extracted the pump. Pump is fine. I am having trouble figuring out what is shorting out my power in my main pump wire."which is pink"
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Was it running before you changed the pump just with low power or are you saying it was running low on voltage?
There are only 2 wires on the pump the black of ground wire gets grounded on the left side of the trunk, the other wire goes to the fuel pump relay in the under hood fuse block along with the pump fuse. Is the pump good? If you pull the fuel pump relay and jumper #30 to terminal #87 in the fuel pump relay connector the pump should run (make sure there's voltage in #30) find the fuel rail test port and remove the plastic cover with the relay connector jumpered push the schreader valve and fuel should spray out. If not and you hear the pump run look for a pinched line or a bad fuel filter which I hope you already changed. I hope this helps. Take care. I know it's late but I'll be around for a bit if you have more questions for me use comment or whatever.
Fuel Pump Flow Control Module (FPCM) - LMF
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a 25 KHZ PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal. Maximum current supplied to the fuel pump is 15 amps. A liquid fuel pressure sensor provides fuel pressure feedback to the FPCM.
Electronic Returnless Fuel System (ERFS) - LMF
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of fuel pump flow control module (FPCM). Desired fuel pressure is commanded by the engine control module (ECM), and transmitted to the FPCM via a GMLAN serial data message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control.
Fuel Pump Flow Control Module (Gas except LU3/LMG/LY6/LC9)
Mounted to the rear frame, near the spare tire mount
Wheels/Vehicle Underbody Component Views
Component Connector End Views
Fuel Pump Relay - Secondary (Gas with LY6)
On the fuse block - underhood bracket
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
DTC P0192: Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage
DTC P0193: Fuel Rail Pressure (FRP) Sensor Circuit High Voltage
DTC P0230: Fuel Pump Relay Control Circuit
The engine control module (ECM) sends the fuel enable signal to the fuel pump control module (FPCM). The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
DTC P0231: Fuel Pump Control Circuit Low Voltage
DTC P0232: Fuel Pump Control Circuit High Voltage
DTC P023F: Fuel Pump Control Circuit
DTC P025A: Fuel Pump Control Module Enable Circuit
Your best bet , take it to a qualified repair shop , dealer .
Ran a hot wire to what fuel pump or the control module ? Which of these is yours ?
Figure 9: Fuel Controls - Fuel Pump Controls (LY6)
Figure 10: Fuel Pump Flow Control Module (Except LY6) Does yours have fuel pump flow control module under the vehicle Fuel Pump Flow Control Module (except LY6)
Mounted to the left side of the frame assembly below the driver seat ?
Fuel Pump Flow Control Module (FPCM) - LMF
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a 25 KHZ PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal. Maximum current supplied to the fuel pump is 15 amps. A liquid fuel pressure sensor provides fuel pressure feedback to the FPCM.
Electronic Returnless Fuel System (ERFS) - LMF
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of fuel pump flow control module (FPCM). Desired fuel pressure is commanded by the engine control module (ECM), and transmitted to the FPCM via a GMLAN serial data message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control.
If your vehicle has this system check it for DTC'S - diagnostic trouble codes . Will take guess work out of it .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
DTC P0192: Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage
DTC P0193: Fuel Rail Pressure (FRP) Sensor Circuit High Voltage
DTC P0230: Fuel Pump Relay Control Circuit
DTC P0231: Fuel Pump Control Circuit Low Voltage
DTC P0232: Fuel Pump Control Circuit High Voltage
DTC P023F: Fuel Pump Control Circuit
The engine control module (ECM) supplies voltage to the fuel pump flow control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the FPCM supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
DTC P025A: Fuel Pump Control Module Enable Circuit . Ford Electronic Returnless Fuel System Diagnosis Part 1 this for ford but the GM system works the same . You'll need a wiring diagram so you know what wires are what . Free wiring diagrams http://www.bbbind.com/free_tsb.html
First check there is battery voltage to the pump and the pump starts when the ignition is switched on , if not check fuse and relay, check wiring from relay to pump. If ok and the pump is working , check for fuel blockage from the tank inlet to the pump , some have a sock type filter in the tank pick up tube, if all ok remove the fuel filter , switch on and fuel should flow at the filter, fit a new filter, if still no fuel at the rail fit a fuel pressure gauge an check for low pressure , if ok, the fuel pressure regulator may be stuck causing a air lock replace it.
Fuel pump relay is in cavity A in the rear SAM ( Signal Acquisition Module.) on the left hand side of the trunk behind a door.
When did you check the voltage..... you must read it while cranking or you will get a zero voltage reading.. The low pressure tank pump builds pressure to the high pressure pump and then shuts down until a pressure drop is sensed in the low pressure line and it then starts up again.
If rail pressure is too low, it often is the high pressure pump in the engine or the relief valve in the fuel rail. The tank pump is low pressure just to stop the tandem pump from cavitating by sucking too hard.
Mercedes can check the rail pressure and do an injector pressure drop to rule out a leaking injector.
If the tank pump is bad it will require replacement.
if you getting low fuel pressure after changing out the fuel filter and the pressure regulator, than the fuel pump may not pump correct amount of pressure. being 1993, the pump has age along and have run many miles, may have gotten weak and not pumping correct mount of psi.
Hello,
It should actually be an oil sending unit, and is located on the back of the intake manifold to the left of the distributor.
*The P0523 is Oil Pressure Sending Unit Voltage too high
*P1693 Generic fault indicating a fault in the bus or PCM/ECM interface
*P1682 - I can't find this code
Anyways,
I will post here all the error codes for future reference.
Dodge Cummins Check Engine Error Codes
Cycle Key on-off-on-off-on to read codes in odometer display
P0002 ECM fuel calibration error
P0016 Crankshaft/Camshaft Timing Misalignment/Out-of- Sync
P0071 Ambient Temperature Sensor Performance / Rationality
P0072 Ambient Temperature Sensor Low
P0073 Ambient Temperature Sensor High
P0088 Fuel Rail Pressure Too High
P0106 Manifold Absolute Pressure Sensor Performance / Rationality
P0107 Manifold Absolute Pressure Sensor Low
P0108 Manifold Absolute Pressure Sensor High
P0111 Intake Air / Charge Temperature Sensor Performance / Rationality
P0112 Intake Air / Charge Temperature Sensor Low
P0113 Intake Air / Charge Temperature Sensor High
P0116 Engine Coolant Temperature Sensor Performance / Rationality
P0117 Engine Coolant Temperature Sensor Low
P0118 Engine Coolant Temperature Sensor High
P0121 Accelerator Position Sensor (APPS) Signal Voltage Too Low
P0122 Accelerator Position Sensor (APPS) LowAPPS Voltage Input Too Low
P0123 Accelerator Position Sensor (APPS) Signal Voltage Too High
P0128 Cooling System Error / Thermostat Rationality
P0148 Fuel Delivery Error
P0168 Fuel Temp Too High
P0169 Water-in-Fuel Detected For Too Long
P0192 Fuel Rail Pressure Sensor Low
P0193 Fuel Rail Pressure Sensor High
P0201 Fuel Injector 1 Circuit
P0202 Fuel Injector 2 Circuit
P0203 Fuel Injector 3 Circuit
P0204 Fuel Injector 4 Circuit
P0205 Fuel Injector 5 Circuit
P0206 Fuel Injector 6 Circuit
P0216 Fuel Injection pump Timing Malfunciton [new injector pump time]
P0217 Coolant Temperature Too High
P0219 Engine Overspeed
P0230 Transfer pump circuit out of range
P0234 Turbocharger Overboost Condition
P0235 Turbocharger Boost Sensor A Circuit
P0236 Turbocharger Boost Pressure Sensor Performance / Rationality
P0237 Turbocharger Boost Pressure Sensor Low
P0238 Turbocharger Boost Pressure Sensor High
P0251 Fuel Injection Pump Mechanical Failure Fuel Valve Feedback Circuit
P0252 Injection Pump Fuel Metering Control "A" Range/Performance
P0253 Fuel Injection Pump Fuel Valve Open Circuit
P0254 Fuel Injection Pump Fuel Valve Current Too High
P0300 Multiple Cylinder Misfire
P0301 Cylinder 1 Misfire
P0302 Cylinder 2 Misfire
P0303 Cylinder 3 Misfire
P0304 Cylinder 4 Misfire
P0305 Cylinder 5 Misfire
P0306 Cylinder 6 Misfire
P0335 Crankshaft Position Sensor Circuit
P0336 Crankshaft Position Sensor Performance
P0337 Crankshaft Position Sensor Circuit Low
P0338 Crankshaft Position Sensor Circuit High
P0340 Camshaft Position Sensor Circuit
P0341 Camshaft Position Sensor Performance / Rationality
P0370 Timing Reference High Resolution Signal "A"
P0380 Intake Air Heater #1 Control circuit
P0381 Wait-to-Start Lamp Inoperative
P0382 Intake Air Heater #2 Control circuit
P0460 Fuel Level Sensor A Circuit
P0461 Fuel Level Sensor 1 Performance / Rationality
P0462 Fuel Level Sensor 1 Low
P0463 Fuel Level Sensor 1 High
P0477 Exhaust Pressure Control Relay Low
P0478 Exhaust Pressure Control Relay High
P0480 Cooling Fan 1 Control Circuit/Open (Low Speed Fan Relay)
P0483 Cooling Fan Speed
P0500 Vehicle Speed Sensor 1 Circuit, or No Vehicle Speed Reference Signal 1
P0514 Battery Temperature Sensor Performance / Rationality
P0516 Battery Temperature Sensor Low
P0517 Battery Temperature Sensor High
P0521 Oil Pressure Sensor Performance / Rationality
P0522 Engine Oil Pressure Sensor/Switch Circuit Low Input
P0523 Oil Pressure Sending Unit Voltage too high
P0524 Oil Pressure Too Low
P0532 A/C Pressure Sensor Low
P0533 A/C Pressure Sensor High
P0541 Intake Air Heater Relay 1 Low
P0542 Intake Air Heater Relay 1 High
P0562 Battery Voltage Low
P0563 Battery Voltage High
P0572 Brake Switch 1 Low
P0573 Brake Switch 1 High
P0576 Cruise Control Input Circuit Low
P0580 Speed Control Multiplexed Switch 1 Low
P0581 Speed Control Multiplexed Switch 1 High
P0602 Control Module Programming Error/NotProgrammed
P0604 Internal Control Module RAM Integrity Failure
P0606 Internal ECM Processor
P0607 ECU Internal Performance
P0622 Generator Field Control Circuit
P0628 Fuel Pump Relay Circuit Low, or Fuel Lift Pump Control Circuit Low
P0629 Fuel Pump Relay Circuit High, or Fuel Lift Pump Control Circuit High
P0630 VIN Not Programmed in PCM
P0633 SKIM Key Not Programmed in PCM
P0642 Sensor Reference Voltage 1 Circuit Low
P0643 Sensor Reference Voltage 1 Circuit High
P0646 A/C Clutch Relay Circuit Low
P0647 A/C Clutch Relay Circuit High
P0652 Sensor Reference Voltage 2 Circuit Low
P0653 Sensor Reference Voltage 2 Circuit High
P0698 Sensor Reference Voltage 3 Circuit Low
P0699 Sensor Reference Voltage 3 Circuit High
P0700 Transmission Control System (MIL Request)
P0743 Torque Converter Clutch Circuit Electrical
P0753 Shift Solenoid "A" Electrical
P0837 Four Wheel Drive (4WD) Switch Performance / Rationality
P0838 Four Wheel Drive (4WD) Switch Circuit Low
P0839 Four Wheel Drive (4WD) Switch Circuit High
P1488 Auxiliary 5 volt supply output is too low
P1492 Ambient/batt temp sensor volts too high
P1493 Ambient/batt temp sensor volts too low
P1596 Speed Control Switch always high
P1597 Speed Control Switch always low
P1652 J1850 Communication Bus
P1687 No Cluster BUS Message or No Messages from the Mechanical Instrument Cluster
P1688 Internal Fuel Injection Pump Controller Failure
P1689 No Communication Between ECM & Injection Pump Module
P1690 Fuel injection pump CKP Sensor Does Not Agree With ECM CKP Sensor
P1691 Fuel Injection Pump Controller Calibration Failure
P1693 Generic fault indicating a fault in the bus or PCM/ECM interface
P1757 Governor pressure is above 3 PSI when 0 PSI is requested
P1762 Governor Press Sensor Offset Volts Too Low or Too High
P1765 Transmission 12 volt supply relay control circuit
P2121 Pedal Position Sensor 1 Performance / Rationality
P2122 Pedal Position Sensor 1 Low
P2123 Pedal Position Sensor 1 High
P2127 Pedal Validation Switch 2 Low
P2128 Pedal Validation Switch 2 High
P2146 Fuel Injector Group 1 Supply Voltage Circuit
P2149 Fuel Injector Group 2 Supply Voltage Circuit
P2266 Water in Fuel Sensor Circuit Low
P2269 Water in Fuel Condition
P2502 Charging System Output Voltage
P2503 Charging System Output Low
P2504 Charging System Output High
P2509 ECM/PCM Power Input Signal Intermittent
P2607 Intake Air Heater Relay 2 Low
P2608 Intake Air Heater Relay 2 High
P2609 Intake Air Heater System Performance
Hope this will help you.
Cheers!
Ryan
Check the fuel pump fuse and relay under the hood in the fuse panel. If both fuse and relay are good then fuel pump may be at fault, but it seems too new for a fuel pump replacement. Hope this helps. Keep me posted please. Good luck
are the batteries fully charged? Low voltage will keep vehicle from starting the fuel pump is on the frame rail below the drivers door you can check the voltage at the pump it could also be fuel pump relay
I have checked wiring from fuse panel all the way back to pump. It looks like a recent pump job was done. I've dropped the tank and extracted the pump. Pump is fine. I am having trouble figuring out what is shorting out my power in my main pump wire."which is pink"
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