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 TCM POWER SOURCE
1. Turn ignition switch to ON position.
  (Do not start engine.)
2. Check voltage between TCM terminals 10, 19, 28 and ground.
  
  Fig 1: Checking TCM Power Source
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Battery voltage
3. Turn ignition switch to OFF position.
4. Check voltage between TCM terminal 28 and ground.
  Voltage: Battery voltage
OK or NG
1. OK: GO TO 2.
2. NG: Check the following items:
  - Harness for short or open between ignition switch and TCM (Main harness)
  - Ignition switch and fuse
    Refer to POWER DISTRIBUTION .
CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY
1. Turn ignition switch to OFF position.
2. Disconnect terminal cord assembly connector in engine compartment.
3. Check resistance between terminals 6 and 7 when A/T is cold.
  
  Fig 2: Checking Automatic Transaxle Fluid Temperature Sensor With Terminal Cord Assembly
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Reinstall any part removed.
OK or NG
1. OK (With CONSULT-II): GO TO 3.
2. OK (Without CONSULT-II): GO TO 4.
3. NG:
  1. Remove oil pan.
  2. Check the following items:
  - A/T fluid temperature sensor
    Refer to COMPONENT INSPECTION .
  - Harness of terminal cord assembly for short or open
CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (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 FLUID TEMP SE.
  
  Fig 3: Checking Automatic Transaxle Fluid Temperature Sensor Input Signal (With CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage
  
  Cold [20°C (68°F)]-->: Approximately 1.5V -->
  
  Hot [80°C (176°F)] 0.5V
OK or NG
1. OK: GO TO 5.
2. NG: Check the following items:
  - Harness for short or open between TCM, ECM and terminal cord assembly (Main harness)
  - Ground circuit for ECM
    Refer to POWER DISTRIBUTION .
CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITHOUT CONSULT-II)
1. Start engine.
2. Check voltage between TCM terminal 47 and ground while warming up A/T.
  
  Fig 4: Checking Automatic Transaxle Fluid Temperature Sensor Input Signal (Without CONSULT-II) (1 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage
  
  Cold [20°C (68°F)] -->: Approximately 1.5V -->
  
  Hot [80°C (176°F)] 0.5V
3. Turn ignition switch to OFF position.
4. Disconnect TCM harness connector.
5. Check resistance between terminal 42 and ground.
  
  Fig 5: Checking Automatic Transaxle Fluid Temperature Sensor Input Signal (Without CONSULT-II) (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist
OK or NG
1. OK: GO TO 5.
2. NG: Check the following items:
  - Harness for short or open between TCM, ECM and terminal cord assembly (Main harness)
  - Ground circuit for ECM
    Refer to POWER DISTRIBUTION .
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.