Inspection Procedure

1. Turn the ignition switch to ON.
2. Measure voltage between terminal 5 (PI) of cruise control ECU assembly and body ground, when the cruise control main switch button is ON and OFF.

   OK 

   TERMINAL VOLTAGE (PI)
   
   

   Cruise Control Switch Button Position	Voltage
   OFF	10 to 16 V
   ON	Below 1.2 V

   Fig 1: Inspecting Terminal Voltage (PI)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: GO TO NEXT STEP 

NG: REPLACE COMBINATION METER ASSEMBLY 

OK: GO TO NEXT STEP 

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSEMBLY