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.

CONFIRM THE SYMPTOM
Check if vehicle creeps forward in "D" position and vehicle can be started from D1.

OK or NG
1. OK: GO TO 2.
2. NG: Refer to "Vehicle Does Not Creep Forward In "D " Position", "VEHICLE CANNOT BE STARTED FROM D1 ".
CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

Do the self-diagnostic results indicate ATF pressure switch 1, ATF pressure switch 5, front brake solenoid valve, direct clutch solenoid valve, accelerator pedal position sensor, turbine revolution sensor, vehicle speed sensor A/T (revolution sensor) and vehicle speed sensor MTR?
1. YE: Check the malfunctioning system. Refer to "DTC P1841 ATF PRESSURE SWITCH 1 ", "DTC P1845 ATF PRESSURE SWITCH 5 ", "DTC P1757 FRONT BRAKE SOLENOID VALVE ", "DTC P1762 DIRECT CLUTCH SOLENOID VALVE ", "DTC P1705 THROTTLE POSITION SENSOR ", "DTC P1716 TURBINE REVOLUTION SENSOR ", "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR) ", "DTC P1721 VEHICLE SPEED SENSOR MTR ".
2. NO: GO TO 3.
CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to "CHECKING A/T FLUID ".

Fig 1: Checking A/T Fluid Level
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 4.
2. NG: Refill ATF.
CHECK LINE PRESSURE

Fig 2: Checking Line Pressure
Courtesy of NISSAN MOTOR CO., U.S.A.

Check line pressure at the engine stall point. Refer to "LINE PRESSURE TEST ".

OK or NG
1. OK: GO TO 7.
2. NG - 1: Line pressure high. GO TO 5.
3. NG - 2: Line pressure low. GO TO 6.
DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
2. Disassemble A/T. Refer to "DISASSEMBLY ".
3. Check the following items:
  - Oil pump assembly. Refer to "OIL PUMP ".
OK or NG
1. OK: GO TO 7.
2. NG: Repair or replace damaged parts.
DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
2. Disassemble A/T. Refer to "DISASSEMBLY ".
3. Check the following items:
  - Oil pump assembly. Refer to "OIL PUMP ".
  - Power train system. Refer to "DISASSEMBLY ".
  - Transmission case. Refer to "DISASSEMBLY ".
OK or NG
1. OK: GO TO 7.
2. NG: Repair or replace damaged parts.
CHECK A/T FLUID CONDITION

Fig 3: Checking A/T Fluid Condition
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Remove oil pan. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
2. Check A/T fluid condition. Refer to "FLUID CONDITION CHECK ".
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 11.
DETECT MALFUNCTIONING ITEM
- Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "SYMPTOM CHART " (Symptom No. 13).
OK or NG
1. OK: GO TO 9.
2. NG: Repair or replace damaged parts.
CHECK SYMPTOM
Check again. Refer to "CRUISE TEST - PART 1 ".

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 10.
PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to "TCM INPUT/OUTPUT SIGNAL REFERENCE VALUES ".
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
1. OK: INSPECTION END
2. NG: Repair or replace damaged parts.
DETECT MALFUNCTIONING ITEM
- Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "SYMPTOM CHART " (Symptom No. 13).
OK or NG
1. OK: GO TO 9.
2. NG: Repair or replace damaged parts.