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.

CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

Do the self-diagnostic results indicate accelerator pedal position sensor, CAN communication line, PNP switch?
1. YES: Check the malfunctioning system. Refer to "DTC P1705 THROTTLE POSITION SENSOR ", "DTC U1000 CAN COMMUNICATION LINE ", "DTC P0705 PARK/NEUTRAL POSITION SWITCH ".
2. NO: GO TO 2.
CHECK CONTROL CABLE
Check the control cable.

Fig 1: Checking Control Cable
Courtesy of NISSAN MOTOR CO., U.S.A.
- Refer to "CHECKING OF A/T POSITION ".
OK or NG
1. OK: GO TO 3.
2. NG: Adjust control cable. Refer to "ADJUSTMENT OF A/T POSITION ".
CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to "CHECKING A/T FLUID ".

Fig 2: 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 STALL TEST
Check stall revolution with selector lever in "D" position. Refer to "STALL TEST ".

Fig 3: Checking Stall Test
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 5.
2. NG: GO TO 7.
CHECK LINE PRESSURE
Check line pressure at idle with selector lever in "D" position. Refer to "LINE PRESSURE TEST ".

Fig 4: Checking Line Pressure
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 8.
2. NG - 1: Line pressure high. GO TO 6.
3. NG - 2: Line pressure low. GO TO 7.
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 8.
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 8.
2. NG: Repair or replace damaged parts.
CHECK A/T FLUID CONDITION

Fig 5: 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 9.
2. NG: GO TO 12.
DETECT MALFUNCTIONING ITEM
- Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "SYMPTOM CHART " (Symptom No. 43).
OK or NG
1. OK: GO TO 10.
2. NG: Repair or replace damaged parts.
CHECK SYMPTOM
Check again. Refer to "CHECK AT IDLE ".

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 11.
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. 43).
OK or NG
1. OK: GO TO 10.
2. NG: Repair or replace damaged parts.