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.

EXCESSIVE N TO D OR N TO R POSITION/RANGE SHIFT SHOCK - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Does shift shock occur only when engine is cold?	Yes	Inspect the following TCM terminal voltages: (See TRANSMISSION CONTROL MODULE (TCM) INSPECTION ) Throttle position sensor signal (TCM terminal U) Ground (TCM terminal AP)
1	Does shift shock occur only when engine is cold?	No	Go to next step.
2	Is line pressure okay? (See LINE PRESSURE TEST . )	Yes	Go to next step.
2	Is line pressure okay? (See LINE PRESSURE TEST . )	No	Repair or replace any defective parts according to inspection results.
3	Is stall speed okay? (See STALL TEST )	Yes	Go to next step.
3	Is stall speed okay? (See STALL TEST )	No	Repair or replace any defective parts according to inspection results.
4	Turn ignition switch to ON. Inspect TCM terminal AP voltage: (See TRANSMISSION CONTROL MODULE (TCM) INSPECTION ) Is voltage okay?	Yes	Inspect ground condition. Overhaul control valve body and repair or replace any defective parts. If problem remains, replace or overhaul transmission and repair or replace any defective parts.
4		No	Adjust throttle position sensor if necessary. Replace throttle position sensor if necessary.
5	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.