Inspection Procedure

PREPARATION:

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

CHECK:

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

Fig 1: Measuring Voltage Between Terminals CCS Of ECM Connector And Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG : Proceed to next circuit inspection shown in  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 resistance between terminal 4 and 5 of the cruise control switch connector when control switch is operated.

   OK:

   SWITCH RESISTANCE REFERENCE
   
   

   Switch position	Resistance (Ω)
   Neutral	infinite (No continuity)
   +/RES	210 - 270
   -/SET	560 - 700
   CANCEL	1380 - 1700

2. Check continuity between terminals 4 and 5 of control switch connector when main switch is held on and off.

   OK:

   CONTINUITY REFERENCE
   
   

   Switch position	Tester connection	Specified condition
   OFF	4 - 5	No continuity
   ON	4 - 5	Continuity

   Fig 2: Measuring Resistance Between Terminal 4 And 5 Of Cruise Control Switch Connector When Control Switch Is Operated

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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  ).