P1434 - FAULT CODE - OBD2

POST UPDATED IN October, 2021

P1434 Code failures by brands

P1434 FORD: A/C REFRIGERANT TEMPERATURE CIRCUIT HIGH

Description of DTC code P1434

The vehicle air conditioning system consists of three main parts: the compressor, the condenser, and the evaporator. Altogether, they are responsible for the distribution of a compound called refrigerant through a closed-loop system of low and high pressure. The refrigerant changes from gas to liquid and back to gas, forming a vital part of the air conditioning system and process.

The compressor is activated through a belt that is joined to the car engine. In this component, before being pumped to the condenser, the low-pressure refrigerant gas is previously compressed into a high-pressure and high-temperature gas. The condenser dissipates heat and cools the refrigerant gas so that it becomes a high-pressure liquid. The liquid is dewatered, and from the evaporator, it is distributed as a gas, taking the heat from inside the vehicle.

The Engine Control Module (ECM) continuously monitors the A/C refrigerant temperature. If the ECM detects that the evaporator control circuit has a high voltage condition, it will set the P1434 OBDII fault code.

Symptoms of fault code P1434

Causes of OBD2 P1434

The P1434 OBD2 diagnostic code is set for one of the following reasons:

  • Evaporator Temperature Sensor wiring may be damaged.
  • The Evaporator Temperature Sensor circuit may be open.
  • The evaporator temperature sensor may be defective.

Possible solutions of the DTC code P1434

Steps to resolve the OBDII DTC P1434 code:

  • See Technical Service Bulletins.
  • Inspect all the wiring associated with the Evaporator Temperature Sensor and check for common damage. Repair as required.
  • Check that the Evaporator Temperature Sensor circuit is not shorted and causing the malfunction. Repair as necessary.
  • Follow the manufacturer's recommendations for diagnosing the Evaporator Temperature Sensor. If after testing you discover some failures, make the appropriate corrections.

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