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.

DTC P0720 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME PID DATA been recorded?	Yes	Go to next step.
1		No	Record FREEZE FRAME PID DATA on repair order, then go to next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Inspect for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step.
2		No	Go to next step.
3	INSPECT OUTPUT SPEED SENSOR CONNECTOR FOR POOR CONNECTION Disconnect output speed sensor connector. Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). Is connection okay?	Yes	Go to next step.
3		No	Repair or replace connector and/or terminals, then go to Step 8.
4	INSPECT OUTPUT SPEED SENSOR RESISTANCE Measure resistance between output speed sensor terminals (part-side). Is resistance within 387-473 ohms between output speed sensor terminals (part-side)? (See OUTPUT SPEED SENSOR INSPECTION .)	Yes	Go to next step.
4		No	Replace output speed sensor, then go to Step 8. (See OUTPUT SPEED SENSOR INSPECTION .)
5	INSPECT TCM CONNECTOR FOR POOR CONNECTION Disconnect TCM connector. Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). Is connection okay?	Yes	Go to next step.
5		No	Repair or replace connector and/or terminals, then go to Step 8.
6	INSPECT HARNESS FOR OPEN CIRCUIT Inspect for continuity between output speed sensor terminals (harness-side) and TCM connector male terminals. A and AE B and AF Is there continuity?	Yes	Go to next step.
6		No	Repair or replace harness, then go to Step 8.
7	INSPECT HARNESS FOR SHORT TO GROUND Inspect for continuity between output speed sensor connector terminal and body ground. A and body ground B and body ground Is there continuity?	Yes	Go to next step.
7		No	Repair or replace harness, then go to next step.
8	VERIFY TROUBLESHOOTING OF DTC P0720 COMPLETED Make sure to reconnect all disconnected connectors. Clear DTC from memory using WDS or equivalent. Drive vehicle with vehicle speed 60 km/h {37 mph} or above for 85 seconds or more. Vehicle speed (VSS PID): 60 km/h {37 mph} Is same DTC present?	Yes	Replace TCM, then go to next step. (See TRANSMISSION CONTROL MODULE (TCM) REMOVAL/INSTALLATION .)
8		No	Go to next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to applicable DTC inspection.
9		No	Troubleshooting completed.