Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK MALFUNCTION
Is this malfunction detected only while driving in reverse?

Yes or No
1. Yes: CHECK A/T PNP SWITCH "R" POSITION. Refer to " DTC P0705: PARK/NEUTRAL POSITION SWITCH ".
2. No: GO TO 2.
CHECK OTHER MALFUNCTIONS
Are other malfunctions also detected by self-diagnosis and CONSULT-II? Refer to "TROUBLE DIAGNOSIS WITHOUT CONSULT-II " and "TROUBLE DIAGNOSIS WITH CONSULT-II ".

Yes or No
1. Yes: CHECK FOR OTHER MALFUNCTIONS. (When other malfunctions are eliminated, line pressure switch malfunction display may disappear.)
2. No: GO TO 3.
CHECK INPUT SIGNAL
1. WITH CONSULT-II: GO TO 4.
2. WITHOUT CONSULT-II: GO TO 5.
CHECK INPUT SIGNAL
With CONSULT-II

Fig 1: Identifying Line Pressure Switch Operation
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Select "ECU INPUT SIGNALS" in Data Monitor.
2. Read out the ON/OFF status of "LINE PRES SW".
  
  Fig 2: CONSULT-II - Data Monitor Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 6.
2. NG: Check the following.
  - Continuity between transfer control unit and transfer terminal cord assembly sub-harness connector
  - Transfer sub-harness
  - Line pressure switch Refer to "4WD Solenoid Valve, Clutch Pressure Switch and Line Pressure Switch", "COMPONENTS INSPECTION ".
CHECK INPUT SIGNAL
Without CONSULT-II
1. Turn ignition switch to "OFF" position.
2. Disconnect transfer control unit harness connector.
3. Check continuity between transfer control unit harness connector terminal 35 and body ground.
  After the vehicle has been left for at least 5 minutes in a room temperature with ignition switch "OFF":
  
  No continuity should exist. With ignition switch in "ON", 4WD shift switch in "AUTO" or "4H" and A/T selector lever in "D": Continuity should exist.
  
  Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector Terminal And Body Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Moving A/T Selector To P Position
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 6.
2. NG: Check the following.
  - Continuity between transfer control unit and transfer terminal cord assembly sub-harness connector
  - Transfer sub-harness
  - Line pressure switch Refer to 4WD SOLENOID VALVE, CLUTCH PRESSURE SWITCH AND LINE PRESSURE SWITCH ", "COMPONENT INSPECTION".
PERFORM SELF-DIAGNOSIS AGAIN
1. Check hydraulic parts.
2. After driving for a while, perform self-diagnosis again. Refer to "TROUBLE DIAGNOSIS WITHOUT CONSULT-II ".
OK or NG
1. OK: INSPECTION END
2. NG:
  1. Perform transfer control unit input/output signal inspection. Refer to TRANSFER CONTROL UNIT INSPECTION TABLE .
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.