NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [5R55S]

id0503c1802200

17

Excessive shift shock from N to D or N to R position/range

DESCRIPTION

•  Strong shock felt when shifting from N to D or N to R position/range.

POSSIBLE CAUSE

•  Shift shock may worsen when the fail-safe is operating. If no DTC is output, the shift shock may worsen due to poor operation of the control valve body or sticking of the clutch.

1.  Clutch burned (N→D: Forward clutch, N→R: Reverse servo or Direct clutch)

•  Line pressure low, high

•  Incorrect fluid level

•  Accelerator pedal position sensor malfunction

•  TFT sensor malfunction

•  Pressure control solenoid A malfunction (N→D only)

•  Pressure control solenoid C malfunction (N→R only)

•  Main control malfunction

•  Sensor ground malfunction

•  Body ground malfunction

•  Digital TR sensor misadjustment or malfunction

2.  Poor hydraulic operation (Malfunction in range change)

•  Forward clutch malfunction

•  Reverse servo malfunction

3.  Idle speed high

4.  Poor tightening torque of engine mount, exhaust mount

Note

•  Before the following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspections are conducted.
(See BASIC INSPECTION [5R55S].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Does the shift shock occur only when the engine is cold?	Yes	Go to the next step.
1	Does the shift shock occur only when the engine is cold?	No	Go to Step 3.
2	Disconnect the TCM connector. Is the resistance between the TCM ground terminal CO and body ground, and between TCM ground terminal CL and body ground less than 5.0 ohms?	Yes	Check the value at the following. (See PCM INSPECTION (Thailand, General (L.H.D. R.H.D.) specs.) [WL-C, WE-C].) (See PID/DATA MONITOR INSPECTION [5R55S].) PCM PIDs (using IDS/PDS): • APP TCM PIDs (using IDS/PDS): • TFT Repair or replace any malfunctioning parts.
2		No	Repair the wiring harness. Reconnect the TCM connector.
3	Is the pressure normal? (See MECHANICAL SYSTEM TEST [5R55S].)	Yes	Go to the next step.
3		No	Repair or replace any malfunctioning parts according to the inspection results.
4	Perform the stall test. (See MECHANICAL SYSTEM TEST [5R55S].) Is stall speed normal?	Yes	Go to the next step.
4		No	Go to Step 5.
5	Inspect the voltage at the following TCM PID using the IDS/PDS. (SeePID/DATA MONITOR INSPECTION [5R55S].) • TR_D Is the PID value normal?	Yes	Clean and inspect main control, if parts are damaged replace main control. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
5		No	Repair or replace any malfunctioning parts.
6	Check the value at the following PCM PIDs using the IDS/PDS. (See PCM INSPECTION (Thailand, General (L.H.D. R.H.D.) specs.) [WL-C, WE-C].) • APP Are the PID values normal?	Yes	Go to the next step.
6		No	Repair or replace any malfunctioning parts.
7	Disconnect the TCM connector. Is the resistance between TCM ground terminal CO and body ground, and between TCM ground terminal CL and body ground less than 5.0 ohms?	Yes	Go to the next step.
7		No	Repair the wiring harness. Reconnect the TCM connector.
8	Inspect the PCA and PCC PID values. (See PID/DATA MONITOR INSPECTION [5R55S].) Are the PCA and PCC PID values normal?	Yes	Clean and inspect main control, if parts are damaged replace main control. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
8		No	Repair or replace any malfunctioning parts.
9	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle repaired, the troubleshooting is completed. • If the vehicle the not repaired or additional diagnostic information is not available, replace the TCM.