#
NO.18 EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING [FS5A-EL]

id050308804600

18 | Excessive shift shock is felt when upshifting and downshifting
DESCRIPTION | • Excessive shift shock is felt when depressing the accelerator pedal at upshifting. During cruising, excessive shift shock is felt when depressing the accelerator pedal at downshifting.
POSSIBLE CAUSE | • Shift shock may worsen when the fail-safe is operating. The shift shock has worsened if the TP sensor, input/turbine speed sensor, or vehicle speed sensor signal malfunctions. 1. Clutch slippage, burnt (Forward clutch, 2-4 brake band, 3-4 clutch) • Line pressure low, high • Shift solenoid D malfunction • Shift solenoid E malfunction • Shift solenoid A malfunction • Shift solenoid B malfunction • Shift solenoid C malfunction • Pressure control solenoid B malfunction • Pressure control solenoid A malfunction • Accelerator cable mis-adjustment • Control valve body malfunction • Body GND malfunction 2. Signal malfunction • Transaxle temperature sensor malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • TP sensor malfunction • APP sensor malfunction • Input/turbine speed sensor malfunction 3. Poor hydraulic operation (Malfunction in range change) • Pressure switch malfunction • Forward accumulator malfunction • Servo apply accumulator malfunction 4. Engine mounts installation • Loose attaching bolts • Worn parts Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | Inspect the engine mounts for loose tightening bolts or worn parts. Are all engine mounts normal? | Yes | Go to the next step.
No | Readjust, retighten or replace engine mounts.
2 | Perform the stall test. (See Stall Test.) Is the stall speed normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
3 | Inspect the value at the following PCM PID using the WDS or equivalent. (See PCM INSPECTION [L8, LF, L3].) • APP • TP REL Is the PID value normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
4 | Disconnect the TCM connector. Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms? | Yes | Go to the next step.
No | Repair the open ground circuit. Reconnect the TCM.
5 | Inspect the LPS PID value. Is the LPS PID value normal? (See TCM INSPECTION [FS5A-EL].) | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].)
No | Repair or replace any malfunctioning parts.
6 | • Verify the 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 is repaired, troubleshooting is completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.