Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 acsy cidtc14

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                                                                                                                                    DI-709
                                                   DIAGNOSTICS         -    AIR CONDITIONING SYSTEM
                                                                                                                                       DI8AE-01




    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 amplifier.
  DTC No.                              Detection Item                                                   Trouble Area
                                                                                 S Engine coolant temperature sensor.
                                                                                 S Harness or connector between engine coolant temperature
                                                                                   sensor and ECM.
       14      Open or short in engine coolant temperature sensor circuit.
                                                                                 S Harness or connector between A/C amplifier and ECM.
                                                                                 S A/C amplifier.
                                                                                 S ECM

WIRING DIAGRAM



                         ECM                                                                       A/C Control Assembly
                               14                                                               16
                                                                      GR-B
                          THWO E9                                                               A25 TW

                                14
                                                  BR
                            THW E11
                                                                  1
                                                                           E2
                                                                           Engine Coolant
                                                                           Temp. Sensor
                                     14
                                                  BR               2
                               E2 E11




                                                                                                                                         I21119




INSPECTION PROCEDURE

   1        Is DTC P0115 output?


                                                            YES             Check engine coolant temperature sensor cir-
                                                                            cuit (See page DI-31 ).


   NO




2001 SIENNA (RM787U)

                                                                                  Author :                   Date :                    863
DI-710
                                   DIAGNOSTICS    -   AIR CONDITIONING SYSTEM



   2     Check voltage between terminal TW and GND of A/C control assembly.

                                        REFERENCE: INSPECTION USING OSCILLOSCOPE
                                        PREPARATION:
                                        (a) Remove the A/C control assembly with connectors still
                                             connected.
                                        (b) Connect the oscilloscope to terminals TW and GND of
                                             A/C control assembly.
                                        CHECK:
                                        Measure signal between terminals TW and GND of A/C control
                                        assembly at each temperature, as shown in the chart.
                                        OK:
                                             Signal:

                                                                              Approx. 80 ms
                                                               12 V
                                          at less than
                                          30 

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