Dtc B1451/51 Compressor Solenoid Circuit

Vehicle Interior. Yaris. Ncp93, 131
Heating Air Conditioning. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (REGULATOR CONTROL CURRENT)

INSPECT COMPRESSOR AND PULLEY

CHECK HARNESS AND CONNECTOR (COMPRESSOR AND PULLEY - AIR CONDITIONING AMPLIFIER)

CHECK HARNESS AND CONNECTOR (COMPRESSOR AND PULLEY - BODY GROUND)

DTC B1451/51 Compressor Solenoid Circuit


DESCRIPTION

In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier.
Based on this signal, the compressor changes the degree of refrigerant compression.

DTC No.
DTC Detection Condition
Trouble Area
B1451/51
Open or short in solenoid of externally changeable compressor circuit
  1. Compressor and pulley
  2. Harness and connector between air conditioning amplifier and compressor and pulley
  3. Air conditioning amplifier

WIRING DIAGRAM


Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan). Dtc B1451/51 Compressor Solenoid Circuit


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM (REGULATOR CONTROL CURRENT)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Select the following menus: Body Electrical / Air Conditioner / Data List /

  1. According to the display on tester, read the "Data List".

    Data List / Air Conditioner:

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Regulator Control Current
    		Regulator control current /
    Min.: 0 A
    Max.: 0.997 A
    		Value changes between 0 A and 0.997 A in accordance with compressor and pulley operation
    		-
    OK:
    The display is as specified in the normal condition column.

    Result:

    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to PROBLEM SYMPTOMS TABLE)
    		B
    OK (When troubleshooting according to the DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000001CXV007X.html)

C
REPLACE AIR CONDITIONING AMPLIFIER (YARIS_NCP93 RM000001HO100MX.html)
A


2.INSPECT COMPRESSOR AND PULLEY
Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan). Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the C8 compressor and pulley connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    C8-1 - C8-2
    		10.1 to 11.1 Ω at 25°C (77°F)

  1. Reconnect the compressor and pulley connector.



NG
REPLACE COMPRESSOR AND PULLEY (YARIS_NCP93 RM000000R8N024X.html)
OK


3.CHECK HARNESS AND CONNECTOR (COMPRESSOR AND PULLEY - AIR CONDITIONING AMPLIFIER)
Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan). Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the C8 compressor and pulley connector.

  1. Disconnect the E8 air conditioning amplifier connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    C8-1 - E8-7 (SOL+)
    		Below 1 Ω
    C8-1 - Body ground
    		10 kΩ or higher

  1. Reconnect the compressor and pulley connector.

  1. Reconnect the air conditioning amplifier connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (COMPRESSOR AND PULLEY - BODY GROUND)
Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan). Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the C8 compressor and pulley connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    C8-2 - Body ground
    		Below 1 Ω

  1. Reconnect the compressor and pulley connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (YARIS_NCP93 RM000001HO100MX.html)