AIR CONDITIONING SYSTEM, Diagnostic DTC:B14AD

DTC Code DTC Name
B14AD Low Pressure Magnetic Valve Circuit

DESCRIPTION

The low pressure magnetic valve is installed to the accumulator and accessory assembly and is open when the power switch is off. When the power switch is on (IG), the low pressure magnetic valve opens or closes according to the heat pump air-conditioning control. When the heat pump air-conditioning control is in cooling/series heating mode, the low pressure magnetic valve is closed based on the signal from the heat pump ECU assembly. When the heat pump air-conditioning control is in parallel heating/heating/gas injection heating mode, the low pressure magnetic valve is open.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14AD Low Pressure Magnetic Valve Circuit Open or short in low pressure magnetic valve circuit

  • Heat pump ECU assembly

  • Low pressure magnetic valve

  • Harness or connector

Memorized

(4 sec. or more)*

WIRING DIAGRAM

A003NLNE05

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. INSPECT HEAT PUMP ECU ASSEMBLY


    1. A003L6LC05
      *a

      Component without harness connected

      (Heat Pump ECU Assembly)

      Disconnect the A42 heat pump ECU assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A42-23 (LPMV) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT LOW PRESSURE MAGNETIC VALVE (POWER SOURCE CIRCUIT) Click here

    OK

  2. INSPECT LOW PRESSURE MAGNETIC VALVE

    A003LC3C02
    *a

    Component without harness connected

    (Low Pressure Magnetic Valve)

    1. Remove the low pressure magnetic valve.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A44-1 (HPMV) - A44-2 (VB) 20°C (68°F) 12.2 to 14 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEAT PUMP ECU ASSEMBLY Click here

    NG

    REPLACE LOW PRESSURE MAGNETIC VALVE Click here

  3. INSPECT LOW PRESSURE MAGNETIC VALVE (POWER SOURCE CIRCUIT)

    A003LC3C01
    *a

    Component without harness connected

    (Low Pressure Magnetic Valve)

    1. Disconnect the A44 low pressure magnetic valve connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A44-2 (VB) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (LOW PRESSURE MAGNETIC VALVE - HEAT PUMP ECU ASSEMBLY)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A44-1 (HPMV) - A42-23 (LPMV) Always Below 1 Ω
      A44-1 (HPMV) or A42-23 (LPMV) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LOW PRESSURE MAGNETIC VALVE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR