Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC WITH ECM
Perform diagnostic test mode II (self-diagnostic results) for engine control. Check ignition signal circuit condition.

OK or NG
1. OK (With CONSULT-II): GO TO 2.
2. OK (Without CONSULT-II): GO TO 3.
3. NG: Check ignition signal circuit for engine control. Refer to SELF-DIAGNOSTICS - 1.8L - EXCEPT CALIFORNIA CA , or SELF-DIAGNOSTICS - 1.8L - CALIFORNIA CA .
CHECK INPUT SIGNAL (WITH CONSULT-II)
1. Start engine.
2. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
  
  Fig 1: Checking Input Signal (With CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Read out the value of ENGINE SPEED.
  Check engine speed changes according to throttle position.
OK or NG
1. OK: GO TO 4.
2. NG: Check the following items:
  - Harness for short or open between TCM and ECM
  - Resistor and ignition coil
    Refer to SELF-DIAGNOSTICS - 1.8L - EXCEPT CALIFORNIA CA , SYSTEM or SELF-DIAGNOSTICS - 1.8L - CALIFORNIA CA .
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
1. Start engine.
2. Check voltage between TCM terminal 39 and ground.
  
  Fig 2: Checking Input Signal (Without CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage (Idle speed): Refer to TCM TERMINALS AND REFERENCE VALUE .
OK or NG
1. OK: GO TO 4.
2. NG: Check the following items:
  - Harness for short or open between TCM and ECM
  - Resistor and ignition coil
    Refer to SELF-DIAGNOSTICS - 1.8L - EXCEPT CALIFORNIA CA ] or SELF-DIAGNOSTICS - 1.8L - CALIFORNIA CA .
CHECK DTC
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.