Inspection Procedure

1. Check output value of ECM.
   1. Connect the hand-held tester to DLC3
   2. Turn the ignition switch to ON and push the hand-held tester main switch ON.
   3. Select the DATA LIST mode on the hand-held tester.
      DATA LIST REFERENCE
      
      

      Item	Condition	Specified Condition	Measurement Item/Range (Display)
      COOLANT TEMP	After Warming Up	80 - 95°C (176 - 203°F)	Coolant Temperature/ Min.: -40°C, Max.: 140°C

1. NG: GO TO ENGINE CONTROL SYSTEM 
2. OK: GO to Next step. 

(REFERENCE) INSPECTION USING OSCILLOSCOPE 

1. Check the input signal waveform.
   1. Remove the combination meter with connectors still connected.
   Fig 1: Locating Temperature Receiver Gauge Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect the oscilloscope to the terminals C9-8 of combination meter assy and body ground.
   3. Start engine.
   4. Check the signal waveform.
      WAVEFORM REFERENCE
      
      

      Item	Contents
      Tool setting	5 V/ DIV, 100 ms/ DV
      Vehicle condition	Ignition switch ON

      Fig 2: Input Signal Waveform

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: CHECK AND REPLACE COMBINATION METER ASSY 
2. NG: GO to Next step. 

1. Remove the combination meter.
2. Check the continuity between terminals 14 (THWO) of ECM and C9-8 of combination meter connector.

   Standard: There is continuity. 

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: CHECK AND REPLACE ECM