Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ECM (LCKI - BODY GROUND)
1. Remove the ECM with connectors being connected.
2. Start the engine and push AUTO switch.
3. Measure the waveform according to the value(S) in the figure Fig 2 below.
  Standard
  
  Fig 1: Locating LCKI Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Result:
  
  Fig 3: Identifying Result Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying Signal Waveform Graphic
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )

C: Go to step 3

A: Go to next step.
INSPECT A/C LOCK SENSOR
1. Disconnect compressor connector.
2. Measure resistance between terminals 1 and 2 of compressor lock sensor connector.
  Standard
  
  Fig 5: Identifying Compressor Lock Sensor Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE A/C LOCK SENSOR

OK: Go to next step.
CHECK HARNESS AND CONNECTOR
1. Measure the resistance according to the value(s) in figure Fig 8 below.
  Standard
  
  Fig 7: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 8: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 9: Identifying LCKI Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN ECM AND AIR CONDITIONING AMPLIFIER)
1. Measure the resistance to the value(S) in the figure Fig 12 below.
  
  Fig 10: Identifying A/C1 Terminal (ECM)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 11: Identifying A/C1 Terminal (AC Amplifier)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 12: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR CONDITIONING AMPLIFIER