Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MPV. 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 DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or on line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CONNECTOR FOR POOR CONNECTION Turn ignition switch to OFF. Disconnect the terminal component No.2 (8-pin) connector. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). Are terminals okay?	Yes	Go to the next step.
3		No	Repair or replace the terminals, then go to Step 12.
4	INSPECT VEHICLE SPEEDOMETER SENSOR RESISTANCE Measure resistance between terminal component No. 2 (8-pin) (transaxle case side). Is resistance within 513-627 ohms between terminal component No. 2 (8-pin) terminal A and B (transaxle case side)?	Yes	Go to the next step.
4		No	Go to Step 8
5	INSPECT TCM CONNECTOR FOR POOR CONNECTION Disconnect the TCM connector. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). Are terminals okay?	Yes	Go to the next step.
5		No	Repair the terminals, then go to Step 12.
6	INSPECT TERMINAL COMPONENT NO. 2 (8-PIN) CIRCUIT FOR OPEN CIRCUIT Check terminal component No. 2 (8-pin) terminals (harness-side) and TCM terminals (harness-side). A and 1M B and 1V Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the harness, then go to Step 12.
7	INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CIRCUIT FOR SHORT TO GROUND Check terminal component No. 2 (8-pin) terminal (harness-side) and body ground. A and body ground B and body ground Is there continuity?	Yes	Repair or replace the harness, then go to Step 12.
7		No	Go to Step 12.
8	INSPECT COUPLER COMPONENT (8-PIN) CONNECTOR FOR POOR CONNECTION Disassemble the control valve body cover. Disconnect the coupler component (8-pin) connector. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). Are terminals okay?	Yes	Go to the next step.
8		No	Repair the terminals, then go to Step 12.
9	INSPECT VEHICLE SPEEDOMETER SENSOR RESISTANCE Measure resistance between coupler component (8-pin) (transaxle case side). Is resistance within 513-627 ohms between coupler component (8-pin) terminal H and F (part side)?	Yes	Repair or replace the terminal component, then go to Step 12.
9		No	Go to the next step.
10	INSPECT VEHICLE SPEEDOMETER SENSOR CONNECTOR FOR POOR CONNECTION Disassemble the transaxle. Disconnect the vehicle speedometer sensor connector. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). Are terminals okay?	Yes	Go to the next step.
10		No	Repair the terminals, then go to Step 12.
11	INSPECT VEHICLE SPEEDOMETER SENSOR RESISTANCE Measure resistance between vehicle speedometer sensor. Is resistance within 513-627 ohms between vehicle speedometer sensor connector terminal A and B (part side)?	Yes	Repair or replace the coupler component, then go to the next step.
11		No	Replace the vehicle speedometer sensor, then go to the next step.
12	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 40 km/h {25 mph} or above for 2 second or more Is same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION .)
12		No	Go to the next step.
13	VERIFY AFTER REPAIR PROCEDURE Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE .) Is there any DTC present?	Yes	Go to the applicable DTC inspection.
13		No	Troubleshooting completed.