Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WIRE HARNESS AND CONNECTOR (ECM - DISTANCE CONTROL ECU)
1. Check for an open or short circuit in harness and connector between the ECM and distance control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
2. OK: Go to next step
INSPECT ECM
1. Remove the ECM with connector.
  
  Fig 1: Identifying ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch ON.
3. Check the signal waveform between terminal ELC (E6-29) of ECM and body ground.
  Standard:
  
  The connect signal waveform appears, as shown in Fig 2 .
HINT:
- Gauge set: 1 V/DIV, 20 ms/DIV
- Condition: Ignition switch ON
Fig 2: Checking Signal Waveform Between Terminal ELC (E6-E29) Of ECM And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE ECM (See REPLACEMENT )
2. OK: REPLACE DISTANCE CONTROL ECU ASSY (see DISTANCE CONTROL ECU ASSY )