Inspection Procedure

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

1. READ VALUE OF INTELLIGENT TESTER (COOLANT TEMPERATURE)*1 
   1. Check the DATA LIST for proper functioning of the engine coolant temperature sensor.

      ECM: 

      ECM REFERENCE
      
      

      Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
      COOLANT TEMP	Engine coolant Temperature (ECT): Min.: -40°C (-40°F), Max.: -140°C (-284°F)	75 to 100°C (167 to 203°F): After warming up engine	If value -40°C (-40°F): ECT sensor open If value 140°C (284°F) or higher:

   NG : GO TO  SFI SYSTEM 

   OK : GO TO NEXT STEP 

2. CHECK COMBINATION METER ASSEMBLY (INDICATOR CHECK)*2 
   1. Disconnect the E2 connector from the engine coolant temperature sensor.
   2. Check the meter indicator conditions according to the table below.

      OK : GO TO NEXT STEP 

      Fig 1: Disconnecting E2 Connector From Engine Coolant Temperature Sensor

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WIRE CONNECTION AND SPECIFIED CONDITION
      
      

      Wire Connection	Condition	Specified Condition
      1 - 2	Short circuit (Ignition switch ON)	Warning light blinks (red)
      All wires are disconnected	Open circuit (Ignition switch ON)	Warning light turns on (blue)

   OK : REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

   NG : GO TO NEXT STEP 

3. CHECK WIRE HARNESS (COMBINATION METER - ECM) 
   1. Disconnect the C11 meter connector.
   2. Disconnect the E5 ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      E5-3 (COOL) - C11-24 (COLD)	Below 1 Ω
      E5-28 (HOT) - C11-23 (HOT)	Below 1 Ω
      C11-24 (COLD) - Body ground	10 kΩ or higher
      C11-23 (HOT) - Body ground	10 kΩ or higher

      Fig 2: Disconnecting C11 Meter Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK : GO TO NEXT STEP 

4. CHECK OPERATION OF COMBINATION METER SYSTEM WITH A NEW OR NORMALLY FUNCTIONING COMBINATION METER 
   1. Temporarily replace the combination meter with a new or normally functioning combination meter.
   2. Check that the malfunction disappears.

      OK: Malfunction disappears. 

   NG : GO TO  SFI SYSTEM 

   OK : REPLACE COMBINATION METER ASSEMBLY