Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC PROCEDURE ".

Do the self-diagnostic results indicate CAN communication?

YES: Perform trouble diagnosis for CAN communication line. Refer to "CAN COMMUNICATION LINE ".

NO: GO TO 2.
CHECK SYSTEM FOR 4WD SHIFT SWITCH
Perform trouble diagnosis for 4WD shift switch system. Refer to "4WD SHIFT SWITCH ".

OK or NG

OK: GO TO 3.

NG: Repair or replace damaged parts.
CHECK SYSTEM FOR PNP SWITCH SIGNAL
Perform trouble diagnosis for PNP switch signal system. Refer to "PNP SWITCH SIGNAL (TCM) ".

OK or NG

OK: GO TO 4.

NG: Repair or replace damaged parts.
CHECK SYSTEM FOR ATP SWITCH
Perform trouble diagnosis for ATP switch system. Refer to "ATP SWITCH ".

OK or NG

OK: GO TO 5.

NG: Repair or replace damaged parts.
CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and combination meter harness connector.
3. Check continuity between the following terminals.
  - Transfer control unit harness connector M152 terminal 15 and combination meter harness connector M24 terminal 21.
    Continuity should exist.
    
    Fig 1: Checking Continuity Between Transfer Control Unit Connector M152 Terminal 15 And Combination Meter Connector M24 Terminal 21
  - Transfer control unit harness connector M153 terminal 40 and combination meter harness connector M24 terminal 1.
    40 TO 1: Continuity should not exist.
    
    1 to 40: Continuity should exist.
    
    Also check harness for short to ground and short to power.
    
    Fig 2: Checking Continuity Between Transfer Control Unit Connector M153 Terminal 40 And Combination Meter Connector M24 Terminal 1
OK or NG

OK: GO TO 6.

NG: Repair or replace damaged parts.
CHECK ATP WARNING LAMP CIRCUIT
1. A/T selector lever "P" position.
2. Connect combination meter harness connector and transfer control unit harness connector.
3. Disconnect ATP switch harness connector.
4. Ground the following terminal using suitable wiring.
5. Turn ignition switch "ON". (Do not start engine.)
  - ATP switch harness connector F55 terminal 8 and ground.
Does indicator lamp turn on?

OK: GO TO 7.

NG: Replace combination meter. Refer to "COMBINATION METER ".
SYMPTOM CHECK
Check again.

OK or NG

OK: Inspection End.

NG: GO TO 8.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

OK or NG

OK: GO TO 9.

NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
CHECK TRANSFER INNER PARTS
1. Disassemble transfer assembly. Refer to "DISASSEMBLY AND ASSEMBLY ".
2. Check transfer inner parts.
OK or NG

OK: Inspection End.

NG: Repair or replace damaged parts.