Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace ground connections.
  
  Fig 1: Checking Engine Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Disconnecting Accelerator Pedal Position (APP) Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester.
  Voltage: Approximately 2.5V
OK or NG
1. OK : GO TO 4.
2. NG : GO TO 3.
  
  Fig 3: Checking Voltage Between APP Sensor Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E21, F34
- 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 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 70.
  Refer to Wiring Diagram .
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 6.
2. NG : GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E21, F34
- 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 74 and APP sensor terminal 6.
  Refer to Wiring Diagram .
  
  Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 8.
2. NG : GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E21, F34
- 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 9.
2. NG : Replace accelerator pedal assembly.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END