Inspection Procedure

CHECK WIRE HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - ECM)
1. Check for an open or short circuit in harness and connector between the distance control ECU and ECM (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
INSPECT CRUISE CONTROL ECU ASSY (DISTANCE CONTROL ECU)
1. Remove the cruise control ECU (distance control ECU) with the connector.
2. Turn the ignition switch to the ON position.
3. Check the signal waveform between terminal LCS (D2-25) of the distance control ECU and body ground.
  Standard: Waveform similar to that in the illustration to the left is output.
  
  HINT:
  - Gauge set: 2 V/DIV, 5 ms/DIV
  - Condition: Ignition switch ON
  Fig 2: Checking Signal Waveform Between Terminal LCS (D2-25) Of Distance Control ECU And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE CRUISE CONTROL ECU ASSY (See CRUISE CONTROL ECU ASSY )
2. OK: REPLACE ECM (See ECM (3MZ-FE) )