Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti G35. 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 two ground screws on the body. Refer to "Ground Inspection ".
  
  Fig 1: Ground Locations
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace ground connections.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Disconnecting Electric Throttle Control Actuator Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
  Voltage: Approximately 5V
  
  Fig 3: Checking Voltage Between Electric Throttle Control Actuator Terminal 1 And Ground With CONSULT-II Or Tester
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 3.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47. Refer to Wiring Diagram.
  Continuity should exist.
OK or NG
1. OK: GO TO 4.
2. NG: Repair or replace open circuit.

CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-III

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

CHECK

ECM terminal	Sensor terminal	Reference Wiring Diagram
47	Electric throttle control actuator terminal 1	Wiring Diagram
91	APP sensor terminal 4	Wiring Diagram

OK or NG

OK: GO TO 5.
NG: Repair 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 11.
2. NG: GO TO 6.
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 THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 5 and ECM terminal 66. 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 8.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following;
  ECM terminal 50 and electric throttle control actuator terminal 4,
  
  ECM terminal 69 and electric throttle control actuator terminal 2.
  
  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 9.
2. NG: Repair open circuit or 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 11.
2. NG: GO TO 10.
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 INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END