Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

NO TCC FUNCTION - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Drive vehicle in D range and inspect the following: 1-2 shift up and down 2-3 shift up and down 3-4 shift up and down Are all shift up and down possible?	Yes	Go to next step.
1		No	No shift at all Go to symptom troubleshooting No. 7 "NO SHIFT ". No shift from 1GR in D rage Inspect output speed sensor. 3GR and 4GR are only available in D range. Inspect shift solenoid A and related harness. 4GR is only available in D range. Inspect both shift solenoids A and B. Inspect shift solenoid related wiring harness including shift solenoid ground. Abnormal shift Go to symptom troubleshooting No. 9 "ABNORMAL SHIFT ".
2	Connect WDS or equivalent to data link connector-2. Access VSS and TP PIDs. Connect voltmeter to TCM terminal AO. Inspect if TCM terminal AO voltage is B+ in torque converter clutch operating condition while monitoring VSS and TP PIDs. (See TYPICAL SHIFT DIAGRAM . ) Is voltage okay?	Yes	Inspect for open or short circuit between TCM terminal AO and shift solenoid terminal C. Repair or replace if necessary. Inspect if torque converter clutch solenoid valve is stuck. (See SOLENOID VALVES INSPECTION . ) Then, go to next step.
2		No	Inspect TCM terminals for bending, damage, corrosion, or loose connection. Inspect the following TCM terminal voltages while driving in suspect condition. (See TRANSMISSION CONTROL MODULE (TCM) INSPECTION ) D range signal (TCM terminal C) Input/turbine speed sensor signal (TCM terminals W and Z) Ground (TCM terminal AP) Output speed sensor signal (TCM terminals AE and AF) Throttle position sensor signal (TCM terminal U) Repair or replace any defective parts.
3	Overhaul control valve body and repair or replace any defective parts. Is problem eliminated?	Yes	AT is now normal.
3		No	Replace torque converter. If problem remains, replace or overhaul transmission and repair or replace any defective parts
4	Verify test results. If okay, return to diagnostic index to service any additional symptoms. If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace TCM.