Inspection Procedure

1. Check that the starter operates normally and that the engine starts.

NO: GO TO ENGINE TROUBLESHOOTING 

YES: GO TO NEXT STEP 

1. See input signal check (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).
2. Check the indicator light when shifting into except D position.

   OK: The indicator light goes off when shifting into except D position. 

Fig 1: Checking Input Signal Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: GO TO NEXT STEP 

1. Turn the ignition switch to ON.
2. Measure voltage between terminal 4 (D) of cruise control ECU assembly connector and body ground when shifting into D position and other positions.

   OK 

   SHIFT POSITION AND VOLTAGE
   
   

   Shift Position	Voltage
   D position	10 to 16 V
   Other positions	Below 1 V

   Fig 2: Inspecting Terminal Voltage (D)

   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 park/neutral position switch (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSEMBLY