Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Titan. 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 ground three screws on the body.
  
  Fig 1: Locating Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Refer to GROUND INSPECTION .
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 Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between electric throttle control actuator terminal 2 and ground with CONSULT-II or tester.
  1. Voltage: Approximately 5V
OK or NG
1. OK: GO TO 7.
2. NG: GO TO 3.
  
  Fig 3: Checking Voltage
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 2 and ECM terminal 47.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
OK or NG
1. OK: GO TO 4.
2. NG: Repair or replace open circuit.
CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-II
Check the following.
- Harness for short to power and short to ground, between the following terminals. See Figure .
OK or NG
1. OK: GO TO 5.
2. NG: Repair short to ground or short to power in harness or connectors.
CHECK ACCELERATOR PEDAL POSITION SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 11.
2. NG: GO TO 6.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace the accelerator pedal assembly.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING in BASIC DIAGNOSTIC PROCEDURES - TITAN article.
3. Perform THROTTLE VALVE CLOSED POSITION LEARNING in BASIC DIAGNOSTIC PROCEDURES - TITAN article.
4. Perform IDLE AIR VOLUME LEARNING in BASIC DIAGNOSTIC PROCEDURES - TITAN article.
  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 4 and ECM terminal 66.
  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 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 ECM terminal 50 and electric throttle control actuator terminal 14, ECM terminal 69 and electric throttle control actuator terminal 3.
  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 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 in BASIC DIAGNOSTIC PROCEDURES - TITAN article.
3. Perform IDLE AIR VOLUME LEARNING in BASIC DIAGNOSTIC PROCEDURES - TITAN article.
  1. INSPECTION END
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END