Question about 1995 Toyota Corolla

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Fuel pump troubleshooting. No fuel to manifold on start. Conector to pump shows voltage on start to 3 pins out of 5.

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  • Toyota Master
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Hi, the pump power is on the blue wire. If that wire is hot and you have ground in the black wire, the pump should be on. If not, replace pump. Please let me know if you have more questions, and thanks for using FixYa.

Fuel pump troubleshooting. 
No fuel - jturcotte_744.gif

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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My 2001vw passat some times won't start unless i use starting fluid.I have changed air filter and spark plugs. When i hook it up no codes come up


Troubleshooting steps:
  1. When you first turn the key on, listen for the sound of the FUEL PUMP (humming sound). If you just turn the key on but don't turn it to START, the fuel pump should run for no more than 3-5 seconds. If it does, continue troubleshooting;
  2. If the FUEL PUMP runs longer than 3-5 seconds, check for fuel leaks.
  3. Test pressure at the fuel rail. If pressure is erratic or too high at idle, replace the fuel pressure regulator;
  4. If fuel pressure is too low at idle, replace the fuel filter. Still too low? Replace the fuel pump and fuel pickup strainer.

Jul 30, 2014 | Cars & Trucks

2 Answers

My 2003 escalade is running rough in idle


between the tb and intake manafold there is a rubber conector they tend to crack near the bottom from heat small cracks so look closley, this is common on that vehicle but may not be the problem just a place to start

Nov 27, 2013 | 2003 Cadillac Escalade Esv

1 Answer

Hard to start the engine


Starting problem can be due to many reasons. Go through the following chart to troubleshoot the problem:
No initial combustion (Engine does not start)
1. ECM power source circuit.
2. Crankshaft position sensor.
3. Camshaft position sensor.
4. Ignition system.
5. Fuel pump control circuit.
6. ECM.
7. VC output circuit
Difficult to start with cold engine
1. Ignition system.
2. Spark plug.
3. Fuel pump control circuit.
4. Fuel Injectors.
5. Cylinder compression.
Difficult to start with warm engine
1. Fuel Injectors.
2. Ignition system.
3. Spark plug.
4. Fuel pump control circuit.

Sep 07, 2013 | Toyota Corolla Cars & Trucks

1 Answer

Hi, I own a MB C230 Kompressor 1999 (123,ooo miles).Two days ago, check engine light came on. DTC was P0170 (fuel trim malfunction bank 1. I took out the MAF sensor and cleaned it using MAF sensor...


CODE PO170 - FUEL TRIM BANK 1 MALFUNCTION. POSSIBLE CAUSES TO YOUR PROBLEM. AIR LEAKS IN THE INTAKE MANIFOLD. EXHAUST PIPES OR EXHAUST MANIFOLD. FUEL CONTROL SENSOR IS OUT OF CALIBRATION ECT IAT MAF. LOW FUEL PUMP PRESSURE FUEL FILTER CLOGGED FUEL PRESSURE REGULATOR FAULTY. ONE OR MORE INJECTORS RESTRICTED OR FUEL PRESSURE REGULATOR FAILED. HO2S ELEMENT IS CONTAMINATED DETERIORATED OR HAS FAILED.LOOK FOR VACUUM HOSE DISCONNECTED BROKEN LEAKING OR LOOSE.CHECK THE MASS AIR FLOW SENSOR SIGNAL CIRCUIT. SHOULD BE 4.8 - 5.2 VOLTS.IF SIGNAL CIRCUIT LOWER VOLTS LOOK FOR SHORT TO GROUND OR AN OPEN HIGH RESISTANCE IN CIRCUIT.IF YOU ARE 12 VOLTS FROM SIGNAL CIRCUIT PCM IS FAULTY.BEFORE SPENDING A LOT OF MONEY TAKE VECHICLE TO GARAGE OR DEALERSHIP.LET THEM TEST IAT AND MASS AIR FLOW SENSOR PARAMETER FOR THE CORRECT RANGE OR HZ USING A VARIABLE SIGNAL GENERATOR TO SEE IF IAT MAF SENSOR GOOD OR PCM FAULTY. THIS WAY YOU WONT SPEND TOO MUCH MONEY.

Jan 09, 2011 | Mercedes-Benz C230 Cars & Trucks

1 Answer

The car sustarted fine, but suddenly shut down as I started driving. It would start again for a split-second then immediately shut down. Battery is fine...it is turning over fine. Can it be a fuel filter?...


Several things could be the cause:- Before looking at the list below ensure that the throttle body interior is spotlessly clean and that the air ducting and all vacuum lines are free of leaks. Check all relays and fuses On the fuel line on the engine there is Shrader valve (like the one for the tire). It is possible to check fuel pressure at this point with a gauge. If there is insufficient pressure here then this points to a possible fault with either the fuel pump, its relay or its fuse.
1) Idle air control - The idle air control is closely associated with the throttle body. Its function is to bleed air to the inlet manifold past the closed throttle plate. There are teo types of throttle control a) a motor that opens the throttle plate a tiny amount b) an auxiliary passage opened by a valve around the closed throttle plate How to check? Physically remove the IACV but keep the electrical connection to it. Turn the engine on and examine the IACV valve movement in response to additional loads (power steering inputs etc). The valve should open and close according to demand causing perceptible change in engine speed with increased power demand being made on the engine.

The electrical connector to the IACV can have 2 or 4 pins:-

2 pins: resistance between pins should about 10 OHMS +/- 3 OHMS. Resistance between either of the pins and the valve body is greater than 10,000 OHMS

4 pins: resistance between diagonally positioned pins should be about 20 OHMS

2) Throttle position sensor - Sometimes with ignition off it is possible to reset the TPS by depressing the accelerator fully and releasing quickly. Ignition might be enhanced by depressing the the throttle slowly. If the car cuts out if the accelerator is depressed quickly this is another indicator of a bad TPS. How to check? The socket for electrical connection with the TPS has 3 pins, one for 'ground', one for 5 volts 'reference' and a third (generally the middle one) for 'signal' output. Back probe the signal pin in the connector to the TPS. Attach the positive lead of a voltmeter to the probe and measure the voltage output as the throttle plate is rotated. If working correctly the meter should show a voltage consistent with the throttle position from approximately 1 volt when closed and 5 volts when fully open. What is looked for is smooth voltage increase with throttle change. If there are drop outs in the transition or that there is no transition seen the TPS is faulty.
3) cam or crank sensor faults - 2 pin socket (magnetic - sine wave output). One pin is 'ground' the other is 'signal'. A voltmeter set to 2 volts AC should measure a signal in the 0.2 to 2 volts range on the 'signal' pin.

3 pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is 'ground' and the third pin is 'signal'. A DC voltage should be detectable in the 0.5 to 1.5 volt range from the 'signal' pin.

It is important that the voltage measurement take place at start up when the engine is cold and again, 20 minutes later, when the engine has fully warmed up to operating temperature. Often the voltage output from faulty sensors declines with temperature rise. I appreciate here that due to a lack of starting in your case it just might be impossible to check the 'warmed up' situation. I hope this helps.

Nov 10, 2010 | 2002 Volkswagen Passat

1 Answer

My 1994 bronco fuel pump is not working, is there a relay i should check first before removing the fuel pump?


Best thing to do is check voltage at fuel pump harness, have some one turn key on and off every 5 secon's, probe wire's at fuel pump harness, one of the wire's will have voltage for about 3 secon's, if you do fuel pump is getting voltage, some time while cranking engine and hitting gas tank with hammer at the same time, fuel pump will start working again, if it start's, you will still need to replace fuel pump or it will happen again, fuel pump is in fuel tank.

Aug 06, 2010 | Ford Bronco Cars & Trucks

3 Answers

What is a good way to troubleshoot a possible fuel pump failure before going out and just buying the part


The best way would be to use a fuel pressure gauge to read the fuel pressure while the engine was running, but you can also try this, when the engine does not start and you suspect the fuel pump to be the problem, then remove a vacuum line from the intake manifold and spray some carburetor spray (has to say extremely flammable on the spray can to work) into the intake manifold and then see if the engine starts, if the engine does start and run for a few seconds on the carburetor spray then there is a fuel delivery problem.

However, and I have found this to be the case with the majority of the 4-Runners that I have worked on,
there seems to be a defect in the rubber fuel line that is attached between the fuel pump and the the metal fuel line that is located on the fuel pump assembly inside of the fuel tank and they all seem to split wide open on the sides and this seems to be a very common problem for those 4-Runners, and that is even why the fuel pump can show as faulty on a fuel pressure gauge, I would certainly not be surprised one bit to find out that the rubber fuel line between the fuel pump and the metal fuel line has a big split down the side of it and is causing the fuel pump to pump more fuel back into the fuel tank than into the fuel line, and it will not be able to supply enough fuel or fuel pressure to the fuel injectors.

If you do drop the fuel tank down to replace the fuel pump, be sure to inspect the rubber line well between the fuel pump and the metal fuel line before you actually purchase a new fuel pump, and most of the time the problem is just that the small piece of rubber fuel line needs to be replaced. (Use fuel injection fuel line only, and compression type "smooth" hose clamps if you can find them)

Jun 18, 2010 | 1990 Toyota 4Runner

1 Answer

Engine stalls at idle after engine has warmed up.


not near enough fuel pump pressure,should be 45 lbs

Jan 31, 2010 | 1994 GMC Suburban

1 Answer

Error codes, oil pressure sensor and engine control moduale


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

Jun 11, 2009 | 1999 Dodge Ram

2 Answers

1988 F-250 460 engine stalls when dribing down the road


On older, carbureted engines, cold stalling (and hard starting) is most often due to an automatic choke that is sticking, misadjusted or broken. Cleaning the choke mechanism with aerosol carburetor cleaner may free up the choke allowing it to work properly again. If the choke housing as an electrical heating element, the element may not be receiving voltage when the key is on, or the element may have burned out (check resistance with an ohmmeter).

Other causes of stalling with a carburetor include an idle speed adjustment screw that is set too low (turn screw to increase idle speed rpm). The engine may stall if the idle fuel mixture screw(s) are not adjusted correctly or the idle mixture port(s) are dirty or clogged with fuel varnish deposits (clean the carburetor and readjust the idle mixture screws for smoothest idle). Stalling can also occur is there are vacuum leaks in the carburetor, under the carburetor (bad base gasket), or any vacuum hose connections to the carburetor or intake manifold

Jun 22, 2008 | 1988 Ford F 250

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