Diagnostic Procedure

WARNING: This page is about a different car, the 2004 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 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 INPUT/OUTPUT SIGNAL CHART .
CHECK INPUT SIGNAL (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out the value of "ENGINE SPEED".
  Check engine speed changes according to throttle position.
Fig 1: Consult II Display
Courtesy of NISSAN MOTOR CO., U.S.A.

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 SYSTEM DESCRIPTION .
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
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.
  1. 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 SYSTEM DESCRIPTION .
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. See INPUT/OUTPUT SIGNAL OF TCM .
  2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.