Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Light tight-corner braking symptom may occur depending on driving conditions in AUTO mode. This is not a malfunction.
Heavy tight-corner braking symptom occurs when vehicle is driven in the following conditions: 4WD shift switch is "4H" or "4LO", steering wheel is turned fully to either side.

CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II) ".

Is "CAN COMM CIRCUIT [U1000]" displayed?
1. YES: Perform trouble diagnosis for CAN communication line. Refer to "CAN COMMUNICATION LINE ".
2. 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
1. OK: GO TO 3.
2. NG: Repair or replace damaged parts.
CHECK ACCELERATOR PEDAL POSITION SIGNAL CIRCUIT
Perform self diagnosis for ECM. Refer to "EMISSION-RELATED DIAGNOSTIC INFORMATION ".

Is any malfunction detected by self-diagnosis?
1. YES: Check the malfunctioning system.
2. NO: GO TO 4.
CHECK SYSTEM FOR CLUTCH PRESSURE SOLENOID
Perform trouble diagnosis for clutch pressure solenoid system. Refer to "CLUTCH PRESSURE SWITCH ".

OK or NG
1. OK: GO TO 5.
2. NG: Repair or replace damaged parts.
SYMPTOM CHECK
Check again.

OK or NG
1. OK: Inspection End.
2. NG: GO TO 6.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

OK or NG
1. OK: GO TO 7.
2. 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
1. OK: Inspection End.
2. NG: Repair or replace damaged parts.