No.16 Engine Flares Up Or Slips When Upshifting Or Downshifting: Notes

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING DESCRIPTION AND POSSIBLE CAUSE

16	Engine flares up or slips when upshifting or downshifting
DESCRIPTION	When accelerator pedal is depressed for driveway, engine speed increases normally but vehicle speed increases slowly. When accelerator pedal is depressed while driving, engine speed increases but vehicle speed does not.
POSSIBLE CAUSE	Clutch slippage (low clutch, high clutch). In the event of clutch slippage, a DTC (incorrect gear ratio) is output. Reduced line pressure Input/output signal malfunction (VSS, turbine sensor, throttle opening angle (CAN communication), TFT sensor, pressure control solenoid, shift solenoids A, B, C and F, oil pressure switches B, C and F). Control valve body malfunction (improper operation, stuck, clogged oil passage). Hydraulic circuit clogging (Pressure control solenoid, shift solenoids B, C and F). Control valve spool malfunction Improper TCM ground Improper ground of GND return line at AT If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage. NOTE: Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION .)

Engine flares up or slips when upshifting or downshifting

DESCRIPTION

When accelerator pedal is depressed for driveway, engine speed increases normally but vehicle speed increases slowly.
When accelerator pedal is depressed while driving, engine speed increases but vehicle speed does not.

POSSIBLE CAUSE

Clutch slippage (low clutch, high clutch).
- In the event of clutch slippage, a DTC (incorrect gear ratio) is output.
Reduced line pressure
Input/output signal malfunction (VSS, turbine sensor, throttle opening angle (CAN communication), TFT sensor, pressure control solenoid, shift solenoids A, B, C and F, oil pressure switches B, C and F).
Control valve body malfunction (improper operation, stuck, clogged oil passage).
- Hydraulic circuit clogging (Pressure control solenoid, shift solenoids B, C and F).
- Control valve spool malfunction
Improper TCM ground
Improper ground of GND return line at AT
- If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage.
NOTE:
- Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION .)