Large Shock ("N" to "D" Position)

Large Shock ("N" to "D" Position)

SYMPTOM: A noticeable shock occurs when the selector lever is shifted from "N" to "D" position.

DIAGNOSTIC PROCEDURE

1. CHECK SELF-DIAGNOSTIC RESULTS

WITH CONSULT-III
^ Perform self-diagnosis.

Without CONSULT-III
^ Perform self-diagnosis. Refer to AT-91, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system. Refer to AT-84, "CONSULT-III Function (TRANSMISSION)", AT-91, "Diagnosis Procedure without CONSULT-III".
Consult-III Function (Transmission)
Diagnosis Procedure Without Consult-III
NO >> GO TO 2.

2. ENGINE IDLE SPEED
Check the engine idle speed. Refer to EC-84, "Idle Speed and Ignition Timing Check" (for VQ35DE) or EC-661, "Idle Speed and Ignition Timing Check" (for VK45DE).
Basic Inspection
OK or NG
OK >> GO TO 3.
NG >> Adjust engine idle speed. Refer to EC-84, "Idle Speed and Ignition Timing Check" (for VQ35DE) or EC-661, "Idle Speed and Ignition Timing Check", (for VK45DE).
Basic Inspection

3. CHECK A/T POSITION





Check the A/T position.
OK or NG
OK >> GO TO 4.
NG >> Adjust A/T position. Refer to AT-207, "Adjustment of A/T Position". Adjustments

4. CHECK A/T FLUID LEVEL





Check the A/T fluid level.
OK or NG
OK >> GO TO 5.
NG >> Refill [1][2]ATF.

5. CHECK LINE PRESSURE





Check line pressure at idle with selector lever in "D" position. Refer to AT-49, "Inspections Before Trouble Diagnosis". Inspections Before Trouble Diagnosis
OK or NG
OK >> GO TO 8.
NG-1 >> Line pressure high: GO TO 6.
NG-2 >> Line pressure low: GO TO 7.

6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM.
2. Disassemble A/T.
3. Check the following.
- Oil pump assembly.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.

7. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM.
2. Disassemble A/T.
3. Check the following.
- Oil pump assembly.
- Power train system.
- Transmission case.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.

8. CHECK A/T FLUID CONDITION
1. Remove oil pan.





2. Check A/T fluid condition. Refer to AT-49, "Inspections Before Trouble Diagnosis". Inspections Before Trouble Diagnosis
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.

9. DETECT MALFUNCTIONING ITEM
Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-59, "Symptom Chart" (Symptom No.1). Symptom Table
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.

10. CHECK SYMPTOM
Check again. Refer to "CHECK AT IDLE".
OK or NG
OK >> INSPECTION END
NG >> GO TO 11.

11. CHECK TCM
1. Check TCM input/output signals. Refer to AT-83, "TCM Input/Output Signal Reference Value". Pinout Values and Diagnostic Parameters
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.