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.

LOW MAXIMUM SPEED AND POOR ACCELERATION DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	With the ignition switch at the ON position, does the gear position indicator light indication correspond to the selector lever position?	Yes	Go to the next step.
1		No	Go to NO.29 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE , or NO.30 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR P, N, R POSITIONS .
2	Go to No. 12 "LACK/LOSS OF POWER-ACCELERATION/CRUISE". (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE .) Is the CIS system normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	Disconnect the solenoid valve connector. Does the vehicle operate as follows? D range: 3GR (fixed) R position: Reverse	Yes	Go to the next step.
3		No	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.
4	Drive the vehicle in D range. Does the vehicle start from stop in the first gear?	Yes	Go to the next step.
4		No	Inspect the following values. (See PCM INSPECTION .) (See TCM INSPECTION .) PCM PIDs (using WDS or equivalent): APP1 APP2 TP_REL VSS TCM terminal voltage: 2G (turbine sensor) 1D (TR switch, P position) 2B (TR switch, N position) 2C (TR switch, R position) 2E (TR switch, D range) 2K (VSS) Repair or replace any malfunctioning parts.
5	Disconnect the TCM connector. Is the resistance between terminal 2U at the TCM connector and terminal J at solenoid valve wiring harness-side connector 5.0 ohms or less ?	Yes	Go to the next step.
5		No	Repair open circuit.
6	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.
6		No	Repair open ground circuit.
7	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 G-J (TCC solenoid) Are the resistances normal?	Yes	Go to the next step.
7		No	Inspect for open circuit in the malfunctioning solenoid related wiring harnesses. If the wiring harnesses are okay, inspect if the solenoids are stuck mechanically.
8	Perform the stall test. (See STALL SPEED TEST .) Is the stall speed normal?	Yes	Verify symptoms of malfunction.
8		No	Overhaul the transmission and repair or replace any malfunction parts. (See AUTOMATIC TRANSAXLE RC4A-EL - OVERHAUL .)
9	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 .)