Diagnosis Procedure

1. CHECK GROUND CONNECTION
   1. Turn ignition switch OFF.
   2. Check ground connection E21. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

   Is the inspection result normal? 

   YES: Go to 2.

   NO: Repair or replace ground connection.

2. CHECK ASCD STEERING SWITCH CIRCUIT

   With CONSULT-III 

   1. Turn ignition switch ON.
   2. Select "MAIN SW", "CANCEL SW", "RESUME/ACC SW" and "SET SW" in "DATA MONITOR" mode with CONSULT-III.
   3. Check each item indication under the following conditions.
   MONITOR ITEMS CONDITION CHART
   
   

   Monitor item	Condition		Indication
   MAIN SW	MAIN switch	Pressed	ON
   		Released	OFF
   CANCEL SW	CANCEL switch	Pressed	ON
   		Released	OFF
   RESUME/ACC SW	RESUME/ACCELERATE switch	Pressed	ON
   		Released	OFF
   SET SW	SET/COAST switch	Pressed	ON
   		Released	OFF

   Without CONSULT-III 

   1. Turn ignition switch ON.
   2. Check the voltage between ECM harness connectors.
   VOLTAGE REFERENCE CHART
   
   

   ECM		ECM		Condition	Voltage
   Connector	Terminal	Connector	Terminal
   E16	85 (ASCD steering switch signal)	E16	92 (Switch ground)	MAIN switch: Pressed	Approx. 0 V
   				CANCEL switch: Pressed	Approx. 1 V
   				SET/COAST switch: Pressed	Approx. 2 V
   				RESUME/ACCELERATE switch: Pressed	Approx. 3 V
   				All ASCD steering switches: Released	Approx. 4 V

   Is the inspection result normal? 

   YES: Go to  8.

   NO: Go to 3.

3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
   1. Turn ignition switch OFF.
   2. Disconnect ECM harness connector.
   3. Disconnect combination switch harness connector M352.
   4. Check the continuity between combination switch and ECM harness connector.
      CONTINUITY REFERENCE CHART
      
      

      Combination switch		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      -	18	E16	92	Existed

   5. Also check harness for short to ground and short to power.

   Is the inspection result normal? 

   YES: Go to  5.

   NO: Go to 4.

4. DETECT MALFUNCTIONING PART

   Check the following.

   • Harness connectors M77, E105
   • Combination switch (spiral cable)
   • Harness for open and short between ECM and combination switch

   Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
   1. Check the continuity between ECM harness connector and combination switch.
      CONTINUITY REFERENCE CHART
      
      

      Combination switch		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      -	21	E10	85	Existed

   2. Also check harness for short to ground and short to power.

   Is the inspection result normal? 

   YES: Go to  7.

   NO: Go to 6.

6. DETECT MALFUNCTIONING PART

   Check the following.

   • Harness connectors M77, E105
   • Combination switch (spiral cable)
   • Harness for open and short between ECM and combination switch

   Repair open circuit or short to ground or short to power in harness or connectors.

7. CHECK ASCD STEERING SWITCH

   Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: Go to 8.

   NO: Replace ASCD steering switch. Refer to "REMOVAL AND INSTALLATION ".

8. CHECK INTERMITTENT INCIDENT

Refer to "INTERMITTENT INCIDENT ".

INSPECTION END