Inspection Procedure

PREPARATION: 

1. Remove the ECM with the connector still connected.
2. Turn the ignition switch ON.

CHECK: 

Measure the voltage between terminal CCS of the ECM connector and body ground when each of the -/SET, +/RES and CANCEL is turned ON.

Fig 1: CCS Of ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
2. OK: Go To Next Step. 

PREPARATION: 

1. Remove steering wheel center pad.
2. Disconnect the cruise control switch connector.

CHECK: 

1. Measure the resistance between terminals 4 and 5 of the cruise control switch connector when the control switch is operated.

   OK: 

   SWITCH CONDITION AND SPECIFIED CONDITION
   
   

   Switch Condition	Specified Condition
   Neutral	1 kΩ or higher
   CRUISE	Below 1 Ω
   +/RES	220 to 260 Ω
   /SET	600 to 660 Ω
   CANCEL	1,500 to 1,600 Ω

2. Measure the resistance between terminals 4 and 5 of the control switch connector when the main switch is held on and off.

Fig 2: Identifying Cruise Control Switch Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: 

1. NG: Replace control switch. 
2. OK: Go To Next Step. 

1. NG: Repair or replace harness or connector. 
2. OK: Go To Next Step. 

1. NG: Replace combination meter. 
2. OK: Check and replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).