Diagnostic procedure

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.

EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Perform the stall test. (See STALL SPEED TEST .) Is the stall speed normal?	Yes	Go to the next step.
1		No	Repair or replace any malfunctioning parts.
2	Inspect the following values. (See PCM INSPECTION .) (See TCM INSPECTION .) APP1 APP2 PCM PIDs (using WDS or equivalent) TP_REL VSS TCM terminal voltage: 2G (turbine sensor) 2K (VSS) Are the values normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	Disconnect the TCM connector. Is the resistance between terminal 2U at the TCM connector and terminal J at the solenoid valve wiring harness-side connector 5.0 ohms or less ?	Yes	Go to the next step.
3		No	Repair open circuit.
4	Is the resistance between ground terminal 2M or 2Q at the TCM connector and body ground 5.0 ohms or less ?	Yes	Go to the next step.
4		No	Repair the wiring harness. Reconnect the TCM.
5	Inspect the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION .) Is the TFT sensor normal?	Yes	Go to the next step.
5		No	Replace the TFT sensor.
6	Stop the engine. Disconnect the solenoid valve connector. Measure the resistance between the following solenoid valve connector terminals. (See SOLENOID VALVE INSPECTION .) Terminals E-J (shift solenoid A) Terminals F-J (shift solenoid B) Terminals H-J (shift solenoid C) Terminals I-J (shift solenoid F) Terminals K-J (pressure control solenoid) Are the resistances normal?	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSAXLE RC4A-EL - OVERHAUL .) If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSAXLE RC4A-EL - OVERHAUL )
6		No	Repair or replace malfunctioning parts.
7	Verify the test results. If normal, return to the diagnostic index to service any additional symptoms. If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If the vehicle is repaired, troubleshooting completed. If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION .)