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                                                                                                                            DI-597
                                               DIAGNOSTICS      -   AIR CONDITIONING SYSTEM
                                                                                                                              DI5CE-02




    DTC                  14              Engine Coolant Temperature Sensor Circuit

CIRCUIT DESCRIPTION
This sensor detects the engine coolant temperature and sends the appropriate signals to the A/C control
assembly. These signals are used for warm up control when the engine is cold.
  DTC No.                           Detection Item                                             Trouble Area

                                                                        S Engine coolant temperature sensor
                                                                        S Harness or connector between engine coolant temp. sensor
                                                                                                                      tem .
     14     O        h t in    i
            Open or short i engine coolant t
                                      l t temperature sensor circuit.
                                                 t            i it
                                                                          and A/C control assembly
                                                                        S A/C control assembly

WIRING DIAGRAM

                                                                                          A/C Amplifier


                                                                               5
                                                     B-R
                                                                             A31       TW

                           1
                                TW
    A36
    Engine Coolant
    Temp. Sensor
                                G
                           3
                                                                               1
                                                     GR
                                                                             A31       SG




                                                                                                                                I08282




2002 4RUNNER (RM887U)

                                                                          Author :                  Date :                    773
DI-598
                                     DIAGNOSTICS   -   AIR CONDITIONING SYSTEM

INSPECTION PROCEDURE

   1      Check voltage between terminals TW and SG of A/C control assembly connector.

                                           PREPARATION:
          ON                               (a) Remove A/C control assembly with connectors still con-
                                                 nected (See page AC-84 ).
                                           (b) Turn ignition switch to ON.
                                           CHECK:
                                           Measure voltage between terminals TW and SG of A/C control
               SG (-)          TW (+)      assembly connector at each engine coolant temperature.
                                           OK:
                                                 Voltage
                                                 at 0 

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