Question about 1997 Mazda MPV

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Diagnostic Code of p1455 Fuel Tank Level Sensor Circuit need suggestions on how to fix

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That code relates to a short or open circuit and that could be the wiring harness or the level sensor in the tank. it's part of the fuel pump assembly. to test the fuel level sensor witch will be the easiest you will need to take the fuel pump assembly out and to do so you have to remove the no. 2 rear seat and pull back the floor mat . un bolt the service hole cover and remove the wire harness plug and fuel lines from the pump. but before you remove the fuel line the pressure has to be relieved from the system. do so by removing fuel pump relay and start vehicle till it stalls then crank over a few more times and the pressure will be relieved. after that take the fuel pump out and drain extra fuel.

take the assembly and connect a multi meter to the to wrie coming off the float level sensor. move the float up and down by hand and the resistance should rise and fall with the movement. if isdoesn't your level sensor has to be replace and if it does the problem is in the wire harness.

you will have to visualy inspect the hole length of the harness. if ok you will need to check for continuity between gauge and level sensor plug.

the two wires at the pump for the sensor are red and blue and when they get to the cluster they are yellow and brown section c-a pin # 38 and 39.

if you have anymore question please ask. good luck

Posted on Sep 23, 2009

  • 1 more comment 
  • michael schultz
    michael schultz Sep 23, 2009

    just to clarify the blue wire is for you low fuel light. all test are preformed with black lead of meter to ground or pump housing and red lead to the wire in question.

  • calrosenblat Sep 30, 2010

    I have the same problem with my fuel level sensor in my 1997 mazda mpv, Where can I buy a replacement sensor? Also It triped the code for the fuel pressure sensor/MAP. I ordered one from parts geek, should have it in a day. Im hoping I did not rush into buying something I did not need. They dont have the fuel level sensor listed as a part, Perhaps I must buy the whole assembly?

    Thanks
    Karl Termini

  • michael schultz
    michael schultz Sep 30, 2010

    your local parts store should have it or would be able to get it. good luck...

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2006 Chevy Colorado Truck. Gas tank filled and fuel gauge indicator dropped to 1/4 full, when truck is idling fuel gauge drops to empty and low fuel light comes on. Suggestions? Thank you.


Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

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03 Mazda MPV fuel gauge drops when parked facing downhill & takes time to correct once level. Is this a known issue & is there a fix?


MPVClub.com :: View topic - p1455 & fuel gauge is intermittent on ...

forum.mpvclub.com/viewtopic.php?t=27060
Jul 19, 2012 - 8 posts - ‎4 authors ... on (P1455) and right around that time the fuel gauge started dropping quickly. The code refers to the fuel tank level sensor circuit but the MPV still ... Joined: 03 Jun 2003... Locate the fuel pump fuse in the fusebox under the driver side kick panel. .... also there are other genuine mazda parts discounters.

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P0462 code


P0462 is Fuel Level Sensor Circuit Low Voltage.
Possible causes - Faulty fuel level sensor
- Fuel level sensor harness is open or shorted
- Fuel level sensor circuit poor electrical connection
Low fuel level can trigger this code. Before replacing any parts try filling up the fuel tank and erasing the engine code. If the problem persist it may be necessary to replaced the fuel level sensor.

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1 Answer

P2175,po463,poo32


Hi there:

DTC P0032 - Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1)
A P0032 DTC (diagnostic trouble code) refers to the O2 sensor (oxygen sensor) located on Bank 1 in front of the catalytic converter. There is also an oxygen sensor behind the converter which is Sensor #2.

This O2 sensor #1 may also be refered to as an air/fuel ratio sensor since on some vehicles it is. The sensor detects the amount of oxygen in the exhaust gas compared to the outside air and then vehicle's computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help get better readings from the O2 sensor. Essentially this P0032 code means that the resistance of the heater circuit is higher than normal. In some cases, that resistance level must be higher than 10 A to trigger the DTC code.

Note, this code is very similar in nature to P0031, P0051, and P0052

Most likely you'll not notice any symptoms other than the MIL (malfunction indicator lamp, a.k.a. the check engine light) will illuminate.

A P0032 DTC trouble code may be caused by one or more of the following:
A short in the heater circuit in the sensor
A failed O2 sensor heater
Wiring/connectors broken/frayed leading to sensor and/or relay
Failed PCM/ECM

Possible Solutions:
To fix a P0032 DTC code, you'll need to do a proper diagnosis. To do that, you'll want to inspect the wiring and connectors leading to the sensor. Also if equipped with a heater relay and fuse, you'll want to check those as well. Use a digital volt ohm meter to:

check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
check the ground circuit for continuity
measure the resistance of the heater circuit (done on the sensor itself)
measure the resistance and voltage of the wiring

Refer to a service manual for the correct specifications (volts, ohms) for your vehicle. On some Toyota vehicles this code is triggered when the resistance of the heater circuit is above 10 A.

With that said, a common fix for this DTC is to replace the air/fuel (O2 oxygen) sensor #2 on bank 1.

Please keep in mind that OEM (original equipment) replacement sensors are recommended (from the dealer). Aftermarket sensors can be less reliable and of poorer quality (not always, but more often). There's also a chance that replacement parts for the P0032 code may also fall under a federal emissions warranty (check with your dealer to see if it's covered).


DTC P0463 - Fuel Level Sensor Circuit High Input
The fuel level sensor (sender) is located in the fuel tank usually integral to the fuel pump module. Usually they cannot be replaced without replacing the fuel pump module, though there are exceptions. There is a float attached to an arm that travels along a resistor which is grounded to the tank, frame or has a dedicated ground circuit. Voltage is supplied to the sender and the ground path changes according to fuel level. How much voltage depends on the system but 5 volts isn't uncommon.

As the fuel level changes, the float moves the arm and changes the resistance to ground which varies the voltage signal. This signal may travel to a fuel pump computer module or directly to the instrument cluster module. Depending on the system, the fuel pump computer module may only monitor the resistance to ground and then relay the fuel level information to the instrument panel. If the fuel level signal to the fuel pump module (or instrument cluster module or PCM (powertrain control module)) goes above 5 volts for a specific amount of time, then the module that is monitoring the fuel level circuit will record this fault code.


Symptoms of a P0463 DTC may include:
Mil (Malfunction indicator lamp) illumination
Fuel level gauge may fluctuate abnormally or read empty or full
Fuel light may illuminate and sound alarm


Potential causes of a P0463 code include:
The signal circuit to the fuel sender is open or shorted to B+ (Battery voltage)
The ground circuit is open, or ground path may have high resistance due to rust or missing ground ******** fuel tank
Damage to the fuel tank could cause problem in fuel level circuit
There's an open in the fuel lever sensor's resistor to ground
Possibly faulty instrument cluster
Less likely is the possibility that the PCM, BCM, or Fuel pump computer module has failed


Possible Solutions: Fuel pump senders normally last the life of the fuel pump. So if you have this code present, do a visual inspection of the fuel tank and wiring harness. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Repair as needed. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. If not, repair the open or short in the wiring.

Doing a voltage drop test on the ground circuit can determine if there is a high resistance path in the ground circuit. You can perform this by using a voltmeter and connecting one lead to the battery ground post and the other to the fuel level sensor ground at the tank. Turn the key on (preferably the engine should be running). Ideally it should be 100 millivolts or less (.1 volts). Anything close to 1 volt indicates a current problem or a developing problem. Repair/clean the fuel level sensor ground as needed. It's not impossible that the instrument cluster has failed internally or on the printed circuit board (if applicable). These are very difficult for the layman to test. But if you have access to a wiring diagram you may be able to remove the cluster and see the damaged circuit if it's located on the printed circuit board, but otherwise you'll need a scan tool that will communicate with the instrument cluster.

A simple way to test the fuel level circuit is to provide a good ground to the fuel level sensor at the fuel tank connector. With the key on the fuel gauge should go to one extreme or the other. Removing the ground path completely should cause the gauge to do the opposite. If the gauge responds, you know the wiring that supplies voltage and ground to the fuel level sensor is good and that the instrument cluster is likely okay. The likely suspect would be the fuel level sensor itself. The fuel tank may need removal to gain access to the fuel pump module in the tank. A PCM or BCM (Body control module) failure isn't impossible but highly unlikely. Don't suspect this first.


DTC P2175 - Throttle Actuator Sys - Low Airflow Detected

Chec HERE (page 350) the PDF information about this test and solution code (P2174 and P2175).


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Possible causes - Fuel level sensor circuit harness is open or shorted
- Fuel level sensor circuit poor electrical connection
- Faulty fuel level sensor in fuel tank (most common cause) P0463 Description The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the Engine Control Module (ECM). The fuel level sensor consists of two parts, one is mechanical float and the other side is variable resistor. The fuel level sensor output voltage changes depending on the movement of the fuel mechanical float

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Code that came up on the OBD is P0463 Fuel level sensor A circuit high input what does that mean and how can it be fix?


DTC P0463 - Fuel gauge sender unit circuit high input
• The PCM monitors the fuel tank level and input voltage from the fuel gauge sender unit when the engine is running. If the input voltage is more than 2.5 V and fuel tank level is empty, the PCM determines that the fuel gauge sender unit circuit input voltage is high.

Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

Possible cause:
• Fuel gauge sender unit malfunction
• Instrument cluster malfunction
• PCM malfunction

Feel free to contact us if need additional details. Good luck.

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Diagnostic Trouble Code (DTC) P0463 is "Fuel Level Sending Unit Volts Too High"
The fuel level sending unit voltage is monitored by the Powertrain Control Module (PCM) when the ignition switch is on and the battery voltage is more than 10.4 volts. This DTC may be stored when the fuel level sending unit voltage at the PCM is more than 9.4 volts for 2 seconds or more. The possible causes are: defective fuel level sending unit , defective connectors or wiring, or a defective PCM.

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Obd-2 code p1455


DTC P1455 - Substantial Leak or Blockage in Evaporative Emission Control System

The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).

Check this possible causes:
After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube
EVAP canister purge valve stuck closed
Damaged EVAP canister
Damaged or missing fuel filler cap
Insufficient fuel filler cap installation
Loose fuel vapor hose/tube connections to EVAP system components
Blockages or restrictions in fuel vapor hoses/tubes (items also listed under disconnections or cracks)
Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked
Canister vent (CV) solenoid stuck open
Mechanically inoperative fuel tank pressure (FTP) sensor


Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank

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the code you have given indicates that there is a problem in the fuel level sender circuit or you have a faulty fuel level sender

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