Inspection Procedure

1. Remove the cruise control ECU assembly with connector still connected.
2. Disconnect the ECM connector.
3. Turn the ignition switch to ON.
4. Measure voltage between terminal 13 (IDL) of cruise control ECU assembly connector and body ground when the throttle valve is fully closed and fully opened.

   OK 

   TERMINAL VOLTAGE (IDL)
   
   

   Throttle Valve Position	Voltage
   Fully opened	10 to 16 V
   Fully closed	Below 1.5 V

   Fig 1: Inspecting Terminal Voltage (IDL)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

NG: GO TO NEXT STEP 

1. Check for open and short circuit in harness and connector between cruise control ECU assembly and ECM (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

NG: CHECK AND REPLACE CRUISE CONTROL ECU ASSEMBLY