Diagnostic Procedure

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

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 Body Ground Screws
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK : GO TO 2.

NG : Repair or replace ground connections.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Identifying Accelerator Pedal Position 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 5V
OK or NG

OK : GO TO 7.

NG : GO TO 3.

Fig 3: Identifying Voltage Between APP Sensor Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
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 .
  Continuity should exist .
OK or NG

OK : GO TO 4.

NG : Repair open circuit.

CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

WIRING DIAGRAM REFERENCE

ECM terminal	Sensor terminal	Reference Wiring
91	APP sensor terminal 1	WIRING DIAGRAM
47	Electric throttle control actuator terminal 2	WIRING DIAGRAM

OK or NG

OK : GO TO 5.

NG : Repair short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK : GO TO 11.

NG : GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator.
2. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
3. Perform "IDLE AIR VOLUME LEARNING ".
: 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 .
  Continuity should exist .
4. Also check harness for short to ground and short to power.
OK or NG

OK : GO TO 8.

NG : 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 .
  Continuity should exist .
2. Also check harness for short to ground and short to power.
OK or NG

OK : GO TO 9.

NG : 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

OK : GO TO 11.

NG : GO TO 10.
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 ".
: INSPECTION END
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END