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 THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

Disconnect electric throttle control actuator harness connector.
Disconnect ECM harness connector.

Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .

CONTINUITY REFERENCE

Electric throttle control actuator terminal	ECM terminal	Continuity
5	5	Should not exist
5	4	Should exist
6	5	Should exist
6	4	Should not exist

Also check harness for short to ground and short to power.

OK or NG

OK : GO TO 3.

NG : Repair or replace.

Fig 2: Locating Electric Throttle Control Actuator

Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK THROTTLE CONTROL MOTOR
Refer to "COMPONENT INSPECTION "

OK or NG

OK : GO TO 4.

NG : GO TO 5.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT "

OK or NG

OK : GO TO 5.

NG : Repair or replace harness or connectors.
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 "
  : INSPECTION END