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.7 SLOW RETURN TO IDLE [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Connect WDS or equivalent to DLC-2. Turn ignition switch to ON. Retrieve any DTC. Is "PASSED" displayed?	Yes	No DTC displayed: Go to the next step.
1		No	DTC displayed: Go to appropriate DTC test.
2	Remove thermostat and inspect operation. (See THERMOSTAT REMOVAL/INSTALLATION ) (See THERMOSTAT INSPECTION ) Is thermostat okay?	Yes	ECT and thermostat are okay. Go to the next step.
2		No	Access ECT PID on WDS or equivalent. Inspect for both ECT and temperature gauge on instrument cluster readings. If temperature gauge on instrument cluster indicates normal range but ECT is not same as temperature gauge reading, inspect ECT sensor. If temperature gauge on instrument cluster indicates cold range but ECT is normal, inspect temperature gauge and heat gauge unit.
3	Is TB free of contaminations?	Yes	Inspect for air leakage from intake-air system components while racing engine to higher speed.
3	Is TB free of contaminations?	No	Clean or replace TB.
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 PCM.