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DTC B1451/51: Compressor Solenoid Circuit: Procedure

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT COMPRESSOR ASSEMBLY WITH PULLEY 
    1. Disconnect the compressor assembly with pulley (compressor solenoid) connector.
      Fig 1: Identifying B7/B94 Connector SOL+ & SOL- Terminals
      GTY290238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B7-2 (SOL+) - B7-1 (SOL-)*1 20°C (68°F) 10 to 11 Ω
      B94-2 (SOL+) - B94-1 (SOL-)*2 20°C (68°F) 10 to 11 Ω
      • *1: for TMC Made
      • *2: except TMC Made
      TEXT IN ILLUSTRATION

      *A for TMC Made
      *B except TMC Made
      *a Component without harness connected
      (Compressor Assembly with Pulley (Compressor Solenoid))

      Result

      Result Proceed to
      OK A
      NG
      (for 2AZ-FE)      		 B
      NG
      (for 2ZR-FE)      		 C

    C → See step   7 

    B → See step   6 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY - BODY GROUND) 
    1. Disconnect the compressor assembly with pulley (compressor solenoid) connector.
      Fig 2: Identifying B7/B94 Connector SOL- Terminal
      GTY291538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B7-1 (SOL-) - Body ground*1 Always Below 1 Ω
      B94-1 (SOL-) - Body ground*2 Always Below 1 Ω
      • *1: for TMC Made
      • *2: except TMC Made
      TEXT IN ILLUSTRATION

      *A for TMC Made
      *B except TMC Made
      *a Front view of wire harness connector
      (to Compressor Assembly with Pulley (Compressor Solenoid))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY - A/C AMPLIFIER) 
    1. Disconnect the compressor assembly with pulley (compressor solenoid) connector.
    2. Disconnect the A/C amplifier connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E30-2 (SOL+) - B7-2 (SOL+)*1 Always Below 1 Ω
      E30-2 (SOL+) - B94-2 (SOL+)*2 Always Below 1 Ω
      E30-2 (SOL+) - Body ground Always 10 kΩ or higher
      • *1: for TMC Made
      • *2: except TMC Made

      Result

      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to DTC) C

    C → See step   5 

    B → See step   4 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  5. REPLACE AIR CONDITIONING AMPLIFIER. Refer to  REMOVAL 
  6. REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (for 2AZ-FE). Refer to  REMOVAL 
  7. REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (for 2ZR-FE). Refer to  REMOVAL 
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