AIR CONDITIONING SYSTEM, Diagnostic DTC:B14C7

DTC Code DTC Name
B14C7 Electric Water Pump Circuit

DESCRIPTION

The air conditioning amplifier assembly uses the target blower temperature to calculate the target water temperature, and performs control of the heater water pump with motor assembly based on the water temperature sensor value.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14C7 Electric Water Pump Circuit While electric water pump drive request signal is output, electric water pump speed is 500 rpm or less for 10 seconds continuously

  • Heater water pump with motor assembly

  • Harness or connector

  • Air conditioning amplifier assembly

Memorized

(10 seconds or more)

Tech Tips

The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the parentheses.

WIRING DIAGRAM

B006JDYE02
*a from IG1 NO. 4 Relay
*b WP
*c Heater Water Pump with Motor Assembly
*d Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note

DTC B14C7 may be output when the self-protection function of the electric water pump activates and stops the pump due to foreign matter jamming the pump or air in the coolant passages causing the pump to run dry.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    4. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Water Pump Heater water pump with motor assembly OFF, ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Water Pump
      OK
      Heater water pump with motor assembly controls on and off using the GTS operation.
      Result
      Result Proceed to
      OK (When troubleshooting according to Problem Symptoms Table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

  2. CHECK HARNESS AND CONNECTOR (HEATER WATER PUMP WITH MOTOR ASSEMBLY - POWER SOURCE CIRCUIT)


    1. B006JIDC04
      *a

      Front view of wire harness connector

      (to Heater Water Pump with Motor Assembly)

      Disconnect the heater water pump with motor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-1 (VV-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A22-4 (+B) - Body ground Power switch off Below 1 V
      A22-4 (+B) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (HEATER WATER PUMP WITH MOTOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the A22 heater water pump with motor assembly connector.

    2. Disconnect the G43 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-3 (SWP) - G43-23 (WP) Always Below 1 Ω
      A22-2 (NWP) - G43-24 (WIP) Always Below 1 Ω
      A22-3 (SWP) or G43-23 (WP) - Body ground Always 10 kΩ or higher
      A22-2 (NWP) or G43-24 (WIP) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HEATER WATER PUMP WITH MOTOR ASSEMBLY


    1. Replace the heater water pump with motor assembly with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14C7 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEATER WATER PUMP WITH MOTOR ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here