Large Shock When Changing From "N" to "R"

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
Perform self-diagnosis. Refer to AT-92, "SELF-DIAGNOSTIC RESULT MODE", AT-103, "TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)".
Self-Diagnostic Result Mode
TCM Self-Diagnostic Procedure (No Tools)
Is any malfunction detected by self-diagnostic results?
YES >> Check malfunctioning system. Refer to AT-92, "SELF-DIAGNOSTIC RESULT MODE", AT-104, "Judgement Self-diagnosis Code".
Self-Diagnostic Result Mode
TCM Self-Diagnostic Procedure (No Tools)
NO >> GO TO 2.

2. ENGINE IDLE SPEED
Check engine idle speed. Refer to EC-83, "Idle Speed and Ignition Timing Check" (for VQ35DE engine), EC-785, "Idle Speed and Ignition Timing Check" (for VK45DE engine).
Programming and Relearning
Testing and Inspection
OK or NG
OK >> GO TO 3.
NG >> Adjust engine idle speed. Refer to EC-83, "Idle Speed and Ignition Timing Check" (for VQ35DE engine), EC-785, "Idle Speed and Ignition Timing Check" (for VK45DE engine).
Programming and Relearning
Testing and Inspection

3. CHECK A/T POSITION
Check A/T position. Refer to AT-228, "Checking of A/T Position". Testing and Inspection
OK or NG
OK >> GO TO 4.
NG >> Adjust A/T position.

4. CHECK A/T FLUID LEVEL
Check A/T fluid level.
OK or NG
OK >> GO TO 5.
NG >> Refill ATF.

5. CHECK LINE PRESSURE
Check line pressure at idle with selector lever in "D" position. Refer to AT-55, "LINE PRESSURE TEST". Line Pressure Test
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
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-53, "A/T Fluid Condition Check". A/T Fluid Condition Check
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.

9. DETECT MALFUNCTIONING ITEM
Check malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-64, "Symptom Chart" (Symptom No.1). Symptom Chart
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.

10. CHECK SYMPTOM
Check again. Refer to AT-57, "Check at Idle". 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-89, "TCM Input/Output Signal Reference Values". 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.