Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

1. CHECK GROUND CONNECTION
   1. Turn ignition switch OFF.
   2. Check ground connection E9. 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 

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

      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 

   1. Turn ignition switch ON.
   2. Check the voltage between ECM harness connector terminals under the following conditions.

      ECM			Condition	Voltage (V)
      Connector	+	-
      	Terminal	Terminal
      E10	85 (ASCD steering switch signal)	92 (ASCD steering switch ground)	MAIN switch: Pressed	Approx. 0
      			CANCEL switch: Pressed	Approx. 1
      			SET/COAST switch: Pressed	Approx. 2
      			RESUME/ACCELERATE switch: Pressed	Approx. 3
      			All ASCD steering switches: Released	Approx. 4

      Fig 1: Checking Voltage Between ECM Harness Connector E10 Terminals

      Courtesy of NISSAN NORTH AMERICA, INC.

      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.
   4. Check the continuity between combination switch and ECM harness connector.

      Combination switch	ECM		Continuity
      Terminal	Connector	Terminal
      16	E10	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 E30, M11
   • Combination switch (spiral cable)
   • Harness for open and short between ECM and combination switch

     : Repair open circuit, 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 combination switch and ECM harness connector.

      Combination switch	ECM		Continuity
      Terminal	Connector	Terminal
      13	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 E30, M1
   • Combination switch (spiral cable)
   • Harness for open and short between ECM and combination switch

     : Repair open circuit, 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