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 ENGINE BRAKING IN 1, 2, OR 3 GEAR - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Inspect adjustment of TR switch. Is TR switch adjusted properly?	Yes	Go to next step.
1		No	Inspect transmission range switch adjustment. (See TRANSMISSION RANGE (TR) SWITCH ADJUSTMENT ) Adjust transmission range switch if necessary. Inspect transmission range switch. Repair or replace any defective parts.
2	Do the following symptoms concurrently occur? Engine flares up or slips during acceleration. Engine flares up or slips when shifting.	Yes	Go to symptom troubleshooting No. 13 "ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING " or No. 14 "ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE ".
2		No	Go to next step.
3	Inspect voltages at the following TCM terminals: (See TRANSMISSION CONTROL MODULE (TCM) INSPECTION ) TCC solenoid valve signal (TCM terminal AO) Input/turbine speed sensor signal (TCM terminals W and Z) Output speed sensor signal (TCM terminals AE and AF) Are voltages okay?	Yes	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.
3		No	Inspect for intermittent open or short circuit on related wiring harness and/or sensor.
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.