Inspection Procedure

1. Drive the vehicle after the engine warms up.
2. Check that overdrive ON <-> OFF occurs by an operation of the O/D switch ON <-> OFF.

NO: GO TO ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM 

YES: GO TO NEXT STEP 

1. Remove the cruise control ECU assembly with the connector still connected.
2. Turn the ignition switch to ON.
3. Disconnect the cruise control ECU assembly connector.
4. Measure voltage between terminal 14 (OD) of harness side connector of cruise control ECU assembly and body ground.

   OK: Voltage: 10 to 14 V 

   Fig 1: Inspecting Terminal Voltage (OD)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  5

OK: GO TO NEXT STEP 

1. Connect the cruise control ECU assembly connector.
2. Perform the test drive after engine warms up.
3. Check voltage between terminal 6 (ECT) of cruise control ECU assembly connector and body ground when O/D switch is ON and OFF.

   OK: 2ZZ-GE, 1ZZ-FE 4WD 

   TERMINAL VOLTAGE (ECT) (2ZZ-GE, 1ZZ-FE 4WD)
   
   

   O/D Switch Position	Voltage
   ON	8 to 16 V
   OFF	Below 0.5 V

   1ZZ-FE FF 

   TERMINAL VOLTAGE (ECT) (1ZZ-FE FF)
   
   

   O/D Switch Position	Voltage
   ON	Below 0.5 V
   OFF	8 to 16 V

   Fig 2: Inspecting Terminal Voltage (ECT)

   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 electronically controlled transmission solenoid (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSEMBLY 

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 ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSEMBLY