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.

1. NO: GO TO ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION [ECT] 

YES: Go to next step 

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

OK: Go to next step 

Voltage: 10-14V 

Fig 1: Identifying Terminal (OD) Of Harness Side Connector Of Cruise Control ECU Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Go to step 

OK: Go to next step 

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

OK: Go to next step 

2ZZ-GE, 1ZZ-FE 4WD: 

1ZZ-FE FF: 

1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN (  PROBLEM SYMPTOMS TABLE  ) 

NG: Go to next step 

Fig 2: Identifying Terminal (ECT) Of Cruise Control ECU Assy Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check for open and short circuit in harness and connector between cruise control ECU assy and electronically controlled transmission solenoid (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

1. Check for open and short circuit in harness and connector between cruise control ECU assy and ECM (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

1. NG: REPAIR OR REPLACE HARNESS OR" CONNECTOR 

OK: Go to next step 

CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  )