Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to "GROUND INSPECTION "
  
  Fig 1: Locating ECM 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 APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
  
  Fig 2: Locating Accelerator Pedal Position Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester
  1. Voltage: Approximately 5V
  Fig 3: Checking Voltage Between APP Sensor Connector Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 8.
2. NG : GO TO 3.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91. Refer to WIRING DIAGRAM
  1. Continuity should exist.
OK or NG
1. OK : GO TO 5.
2. NG : GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M59, F27
- Harness for open between ECM and accelerator pedal position sensor
  1. : Repair or replace open circuit.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check the following.
- Harness for short to power and short to ground, between the following terminals listed in Fig 4.
  
  Fig 4: ECM Terminals And APP Sensor 1 Terminals Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 6.
2. NG : Repair short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR
Refer to "COMPONENT INSPECTION "

OK or NG
1. OK : GO TO 14.
2. NG : GO TO 7.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform "THROTTLE VALVE CLOSED POSITION LEARNING "
3. Perform "IDLE AIR VOLUME LEARNING "
  1. : INSPECTION END
CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 5 and ECM terminal 83. Refer to WIRING DIAGRAM
  1. Continuity should exist
4. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 10.
2. NG : GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M59, F27
- Harness for open or short between ECM and accelerator pedal position sensor
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 98 and APP sensor terminal 6. 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 12.
2. NG : GO TO 11.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M59, F27
- Harness for open or short between ECM and accelerator pedal position sensor
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK APP SENSOR
Refer to "COMPONENT INSPECTION "

OK or NG
1. OK : GO TO 14.
2. NG : GO TO 13.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING "
3. Perform "THROTTLE VALVE CLOSED POSITION LEARNING "
4. Perform "IDLE AIR VOLUME LEARNING "
  1. : INSPECTION END
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT "
1. : INSPECTION END