P1456 - FAULT CODE P1456 - OBD2

POST UPDATED IN January, 2021

P1456 Code failures by brands

P1456 FORD: FUEL TANK TEMPERATURE SENSOR CIRCUIT MALFUNCTION

P1456 ACURA: EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTION

P1456 HONDA: EVAPORATIVE EMISSION CONTROL SYSTEM (EVAP) LEAKAGE.

P1456 BMW: HEATED CATALYST HEATER POWER SUPPLY OPEN CIRCUIT (BANK 1)

P1456 NISSAN: EVAPORATIVE CONTROL SYSTEM

P1456 VOLKSWAGEN, AUDI, VOLVO EXHAUST GAS TEMPERATURE CONTROL BANK 1 LIMIT ATTAINED.

P1456 GM: CATALYST HEATER DIAGNOSIS

Description of DTC code P1456

The Fuel Temperature Sensor is a device that measures the temperature of the fuel but also the number of contaminants that the fuel may have. These aspects are fundamental for vehicles that use a flexible fuel, taking into account that methanol does not have the same calorific level as gasoline, the PCM must adjust the ignition time and pulse width to compensate for the lower calorific value of ethanol so that the power is greater and the least amount of fuel is used.

DTC code P1456 OBDII is set when the PCM (Powertrain Control Module) detects out-of-range voltage signals in the Fuel Temperature Sensor circuit, taking into account that each manufacturer determines the appropriate voltage for the circuit, you should consult the source of information to know how it applies in your vehicle.

Symptoms of fault code P1456

  • Check Engine lighting.
  • Difficulty in starting the engine.
  • The engine is unstable during acceleration.
  • Other fuel system related fault codes

Causes of OBD2 P1456

The factors by which the diagnostic code P1456 OBD2 is stored are

  • The circuit may have damage to the wires or connectors that causes a short circuit.
  • The Fuel Temperature Sensor may be defective.

Possible solutions of the DTC code P1456

The steps to solve the error code P1456 OBDII are the following:

  • As a first step, you need to consult the TSB (Technical Service Bulletins).
  • Locate all circuit wiring and check for common damages such as wear, corrosion, or burns. Make any necessary repairs or changes.
  • Make reference voltage, resistance, ground signal, and continuity checks for wiring related to the sensor circuit. Pay attention to the reference voltage and resistance between the sensor and the PCM. If one of these values is not adequate, follow the manufacturer's diagnostic procedure steps.
  • By using an oscilloscope, locate the fuel temperature sensor and verify that the pulse width does not deviate from that indicated by the manufacturer. If the oscilloscope data does not match the diagram, make the necessary corrections.

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