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NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [FS5A-EL]

id050308801900

14 | Engine flares up or slips when upshifting or downshifting
DESCRIPTION | • When the accelerator pedal is depressed for driveaway, engine speed increases but vehicle speed increases slowly. • When the accelerator pedal is depressed while driving, engine speed increases but the vehicle does not.
POSSIBLE CAUSE | • There is clutch slippage because the clutch is stuck or the line pressure is low. 1. Clutch stuck, slippage (forward clutch, 3-4 clutch, 2-4 brake band, one-way clutch) • Line pressure low • Shift solenoid D malfunction • Shift solenoid E malfunction • Shift solenoid F malfunction • Shift solenoid A malfunction • Shift solenoid B malfunction • Shift solenoid C malfunction • Pressure control solenoid A malfunction • Body GND malfunction • Control valve body malfunction 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • APP sensor malfunction • TP sensor malfunction • Input/turbine speed sensor malfunction 3. Poor operation of mechanical pressure • Selector lever position disparity • TR switch position disparity 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 | Is shift point normal? | Yes | Go to the next step.
No | Go to No.9 "ABNORMAL SHIFTING".
2 | Inspect the value at the following TCM PID using the WDS or equivalent. (See TCM INSPECTION [FS5A-EL].) • THOP Is the PID value normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
3 | 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.
4 | 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.
5 | • 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.