Diagnostic Procedure

Perform diagnostic test mode II (self-diagnostic results) for engine control.

Refer to ON-BOARD DIAGNOSTICS or SELF-DIAGNOSTIC SYSTEM .

OK or NG 

1. OK (With CONSULT-II): GO TO 2.
2. OK (Without CONSULT-II): GO TO  3
3. NG: Check throttle position sensor circuit for engine control. Refer to DTC P0121, DTC P0122 OR DTC P0123: TP SENSOR , DTC P0121, P0122, P0123 TP SENSOR or , DTC P0121, P0122, P0123 TP SENSOR DTC P0121, DTC P0122 OR DTC P0123: THROTTLE POSITION SENSOR (TP) .

With CONSULT-II 

1. Apply vacuum to the throttle opener then check the following. Refer to steps 1 through 5 of PREPARATION  in TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS) .
2. Turn ignition switch to ON position.

   (Do not start engine.)

3. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
4. Read out the value of THRTL POS SEN.
   Fig 1: Checking Input Signal (With CONSULT-II)

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

   Voltage 

   Fully-closed throttle: Approximately 0.5V 

   Fully-open throttle: Approximately 4V 

   OK or NG 

   1. OK: GO TO  4.
   2. NG: Check harness for short or open between ECM and TCM regarding throttle position sensor circuit. (Main harness)

Without CONSULT-II 

1. Apply vacuum to the throttle opener then check the following. Refer to steps 1 through 5 of PREPARATION  in TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS) .
2. Turn ignition switch to ON position.

   (Do not start engine.)

3. Check voltage between TCM terminals 41 and 42 while accelerator pedal is depressed slowly.
   Fig 2: Checking Input Signal (Without CONSULT-II)

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

   Voltage 

   Fully-closed throttle: Approximately 0.5V 

   valve 

   Fully-open throttle: Approximately 4V 

   valve 

   (Voltage rises gradually in response to throttle position) 

OK or NG 

1. OK: GO TO  5.
2. NG: Check harness for short or open between ECM and TCM regarding throttle position sensor circuit. (Main harness)

With CONSULT-II 

1. Apply vacuum to the throttle opener, then check the following. Refer to steps 1 through 5 of PREPARATION  in TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS) .
2. Turn ignition switch to ON position.

   (Do not start engine.)

3. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
4. Read out CLOSED THL/SW and W/O THRL/P-SW depressing and releasing accelerator pedal. Check the signal of throttle position switch is indicated properly.
   Fig 3: Data Monitor Mode Chart

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 4: Checking Throttle Position Switch Circuit (With CONSULT-II)

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

OK or NG 

1. OK: GO TO  6.
2. NG: Check the following
   • Throttle position switch - Refer to COMPONENT INSPECTION .
   • Harness for short or open between ignition switch and throttle position switch (Main harness)
   • switch (Main harness)
   • Harness for short or open between throttle position switch and TCM (Main harness)

Without CONSULT-II 

1. Apply vacuum to the throttle opener, then check the following. Refer to steps 1 through 5 of PREPARATION  in TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS) .
2. Turn ignition switch to ON position.

   (Do not start engine.)

3. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly. (After warming up engine)
   Fig 5: Checking Throttle Position Switch Circuit (Without CONSULT-II) (1 Of 2)

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 6: Checking Throttle Position Switch Circuit (Without CONSULT-II) (2 Of 2)

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

OK or NG 

1. OK: GO TO 6.
2. NG: Check the following items:
   • Throttle position switch - Refer to COMPONENT INSPECTION .
   • Harness for short or open between ignition switch and throttle position switch (Main harness)
   • Harness for short or open between throttle position switch and TCM (Main harness)

Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

OK or NG 

1. OK: INSPECTION END 
2. NG:
   1. Perform TCM input/output signal inspection.
   2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.