DTC P0720:00 [AY6A-EL, AY6AX-EL]

id0502k1817700

DTC P0720:00 | VSS circuit
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DETECTION CONDITION | • Conditions: TCM communication normal • Circumstances: Normal VSS signal not input • Time period: Determined after 10 times lasting 0.1 or more seconds Diagnostic support note: • The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle. • The AT warning light illuminates. • PENDING CODE is not available. • FREEZE FRAME DATA is available. • The DTC is stored in the TCM memory.
FAIL-SAFE FUNCTION | • Inhibits learning control • Inhibits adaptive shift control • Back up from another device (DSC/RSC HU/CM, input/turbine speed sensor)
POSSIBLE CAUSE | • Coupler component connector or terminal malfunction • Short to GND in wiring harness between VSS terminal A and TCM terminal B19 • Short to GND in wiring harness between VSS terminal B and TCM terminal B20 • VSS connector or terminal malfunction • VSS malfunction • Open circuit between VSS terminal A and TCM terminal B19 • Open circuit between VSS terminal B and TCM terminal B20 • TCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded on the repair order? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT COUPLER COMPONENT CONNECTOR FOR POOR CONNECTION • Switch the ignition OFF. • Remove the TCM. (See TCM REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].) • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 8.
No | Go to the next step.
4 | INSPECT VSS CIRCUIT FOR SHORT TO GND • Switch the ignition OFF. • Inspect for continuity between the following circuits: ― Coupler component terminal B19 (wiring harness-side) and body GND ― Coupler component terminal B20 (wiring harness-side) and body GND • Is there continuity? | Yes | Repair or replace the wiring harness for a possible short to GND, then go to Step 8.
No | Go to the next step.
5 | INSPECT VSS CONNECTOR FOR POOR CONNECTION • Switch the ignition OFF. • Disconnect the VSS connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 8.
No | Go to the next step.
6 | INSPECT VSS • Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [AY6A-EL, AY6AX-EL].) • Is there any malfunction? | Yes | Replace the VSS, then go to Step 8. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
No | Go to the next step.
7 | INSPECT VSS CIRCUIT FOR OPEN CIRCUIT • Switch the ignition OFF. • Inspect for continuity between the following circuits: ― VSS terminal A (wiring harness-side) and coupler component terminal B19 (wiring harness-side) ― VSS terminal B (wiring harness-side) and coupler component terminal B20 (wiring harness-side) • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC using the M-MDS. • Perform the following procedure to ensure that the DTC has been resolved: 1. Start the engine. 2. Warm up the engine to normal operating temperature. 3. Drive the vehicle, two separate times, in D position at 20 km/h {12 mph} or more for 150 s or more. • Is the same DTC present? | Yes | Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
No | Go to the next step.
9 | VERIFY NO DTCs ARE PRESENT • Perform the “Reading DTCs Procedure”. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [AY6A-EL, AY6AX-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [AY6A-EL, AY6AX-EL].)
No | DTC troubleshooting completed.