Diagnostic Procedure

• Check P code with CONSULT-II "ENGINE".

  Turn ignition switch ON and select "SELF DIAGNOSTIC RESULTS" mode for "ENGINE" with CONSULT-II.

  Refer to "MALFUNCTION INDICATOR LAMP (MIL) " (with QR25DE), or "MALFUNCTION INDICATOR LAMP (MIL) " (with VQ35DE).

OK or NG

1. OK (with CONSULT-II): GO TO 2.
2. NG: Check accelerator pedal position (APP) sensor circuit for engine control. Refer to "DTC P0122, P0123: TP SENSOR " and "DTC P2122, P2123: APP SENSOR " (with QR25DE), or "DTC P0122, P0123: TP SENSOR " and "DTC P2122, P2123: APP SENSOR " (with VQ35DE) . If CAN communication line is detected, GO TO "DTC U1000 CAN COMMUNICATION LINE ".

With CONSULT-II 

1. Turn ignition switch to ON position.

   (Do not start engine.)

2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out the value of "THRTL POS SEN".

   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)
   Fig 1: Scan Tool Display "Data Monitor"

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

Without CONSULT-II 

1. Turn ignition switch to ON position. (Do not start engine.)
2. Check voltage between TCM terminals 41 (W) and 42 (B) while accelerator pedal is depressed slowly.

   Voltage: 

   Fully-closed throttle valve :Approximately 0.5V 

   Fully-open throttle valve :Approximately 4V 

   (Voltage rises gradually in response to throttle position.) 

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)
   Fig 2: TCM & Harness Connector Voltage Test

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

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

OK or NG

1. OK: INSPECTION END 
2. NG: Repair or replace damaged parts.