Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
  Refer to "GROUND INSPECTION ".
  
  Fig 1: Locating Three Ground Screws On Body
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace ground connections.
CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch ON.
2. Select "MAIN SW", "RESUME/ACC SW", "SET SW" and "CANCEL SW" in "DATA MONITOR" mode with CONSULT-II.
3. Check each item indication under the following conditions.
  
  Fig 2: Switch Indication Conditions
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Display Data Monitor Mode
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 99 and ground with pressing each button.
  
  Fig 4: Switch Voltage Specifications Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Voltage Between ECM Terminal 99 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 3.
CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect ASCD steering switch harness connector.
4. Check harness continuity between ASCD steering switch terminal 2 and ECM terminal 67.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M135, F105
- Combination switch (spiral cable)
- Harness for open and short between ECM and ASCD steering switch
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 99 and ASCD steering switch terminal 1.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 7.
2. NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M135, F105
- Combination switch (spiral cable)
- Harness for open and short between ECM and ASCD steering switch
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ASCD STEERING SWITCH
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 8.
2. NG: Replace ASCD steering switch.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. INSPECTION END