The fuel pump inertia switch is behind the passenger side kick panel on the floor. you should be able to reach it through a opening in the panel or try reaching it over the top of the panel press it to reset it then turn the key off and on several times first to build the fuel pressure up, then start the engine that should do it.
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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.
italmost sounds as if the switch has gone bad again..maybe from trying to start it too many times after it ran out of gas?? replace the switch again and see if that dosent solve the problem.i believe it will please rate me
The fuel pump relay has four pins. Two pins relate to low power switch circuit from the ECU and the other pins relate to the high current switched circuit which has a permanent power in and switched power out (to fuel pump). Check that the ground on the lower switch circuit pins is good and then check that when the ignition key is in the 'on' position that the low power switch pin has 12.6ish volts supplied to it. If there is no low power switching supply then the relay cannot function. If there is low power supply but no voltage switch on the output then the issue sounds like the relay itself. Pull the relay out and check that it clicks when 12v is dropped across the low circuit pins. Check the resistance across the high current output circuit pins when the low pins are given 12 volts. As 12 volts is applied across the low voltage pins the resistance across the high current output pins should drop to near zero as the internal contacts are closed. As the low side voltage is removed the high side pin resistance should once again register open circuit (infinite resistance). If the relay clicks but fails to output then either replace the relay or open it up and get a nail file and draw it between the contact pins to remove any corrosion.
the switches you refer to are the fuel pump relay?? did you check the inertia switch? it is located on the passenger side floor board under the carpet, pull the carpet back from the top and you will see the switch, make sure to press the button on the switch to make sure it is not popped out. ? and which pump did you replace you have one in the tank and the other is under the drivers door on the frame, it is the high pressure pump, low pressue is in the tank..
You connect a fuel pressure gauge like this to the pressure rail. Pressure in this car must be between 35 and 45 psi. If pressure is too low look for kinked fuel lines and eventually replace the pump. If the pressure drops down more than 10 psi in five minutes or if the pressure is considerably higher than that replace the fuel pressure regulator. Below the parts that may need testing:
I'm sorry to hear that. The fuel pump is in the fuel tank. Make certain that all the rest of the fuel system working before you have to drop the tank. 1.Fuel pump relay or any fuses.2.Replace fuel filter,(inline between tank ane pressure regulator). 3.Trace power and ground wires from tank back to relay looking for breaks or pinches. 4.Look for a pump reset switch. If all that is good, then replace the pump. Good luck.
mine was doing the same...switch was bad. a bit convoluted really but if your high pressure pump is running and not getting your tank pumps to go, unless you jump there at the switch harness prolly the switch.
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
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.