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.

HINT: When using the hand-held tester, start inspection step 1 and when not using the hand-held tester, start from step 2.

READ VALUE OF HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main SW ON.
3. Select the items below in the DATA LIST, and read the display on the hand-held tester.
  DATA LIST / ENGINE AND ECT / ALL
  
  Fig 1: Measurement Item Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: GO TO STEP 6

OK: Go to next step.
INSPECT MAGNET CLUTCH RELAY
1. Remove the relay (magnet clutch relay) from engine room R/B.
2. Measure the resistance according to the value(s) in the figure Fig 3 below.
  
  Fig 2: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Fig 3: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE MAGNET CLUTCH RELAY

OK: Go to next step.
INSPECT ECM (ACMG - BODY GROUND)
1. Remove the ECM with connectors still connected.
2. Start the engine.
3. Measure the resistance according to the value(s) in the figure Fig 5 below.
  
  Fig 4: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Fig 5: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: GO TO STEP 6

OK: Go to next step.
INSPECT MAGNET CLUTCH ASSY
1. Disconnect the connector from the magnet clutch ass.
2. Connect the positive (+) lead from the battery to terminal 3 and negative (-) lead to terminal body ground, then check that the magnetic clutch assy is engaged.
  
  Fig 6: Identifying Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE MAGNET CLUTCH ASSY

OK: Go to next step.
CHECK HARNESS AND CONNECTOR(ECM - MAGNETIC CLUTCH ASSY)
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )
CHECK HARNESS AND CONNECTOR(ECM - A/C AMPLIFIER)
1. Disconnect the connector.
2. Measure the resistance according to the value(s) in the figure Fig 9 below.
  
  Fig 7: Measuring Resistance (ECM Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 8: Identifying Resistance (A/C Amplifier)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Fig 9: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step.
INSPECT ECM
1. Remove the ECM with connectors still connected.
2. Start the engine and push the A/C switch.
3. Measure the voltage according to the value(s) in the figure Fig 11 below.
  
  Fig 10: Measuring Voltage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Fig 11: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE A/C AMPLIFIER

OK: REPLACE ECM