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DTC P0720 [FS5A-EL]

id050221809800

DTC P0720 | Vehicle speed sensor (VSS) circuit malfunction
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DETECTION CONDITION | • Vehicle speed signal is not input after the following conditions are met and 4.5 s or more have passed. - D range switch ON - Engine coolant temperature 60 °C {140 °F} or more - Turbine speed 1,500 rpm or more - Secondary gear revolution speed 50 rpm or more Diagnostic support note: • This is a continuous monitor (CCM). • The MIL illuminates if the TCM detects the above malfunction conditions during the first drive cycle. • The PENDING CODE is available if the TCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • The AT warning light illuminates. • The DTC is stored in the TCM memory.
POSSIBLE CAUSE | • VSS malfunction • Open circuit in wiring harness between VSS terminal B and TCM terminal 2P • Short to ground in wiring harness between VSS terminal B and TCM terminal 2P • Open circuit in wiring harness between VSS terminal A and main relay terminal C • Short to ground in wiring harness between VSS terminal A and AT main relay terminal A • Open circuit in wiring harness between VSS terminal C and body ground • Damaged connectors between VSS and TCM • 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? | 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 SERVICE INFORMATION AVAILABILITY • Verify 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 the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT VSS CONNECTOR FOR POOR CONNECTION • Turn the ignition switch to the LOCK position. • Disconnect the VSS connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is the connection normal? | Yes | Go to the next step.
No | Repair or replace the pin or connector, then go to Step 11.
4 | INSPECT VSS POWER CIRCUIT FOR OPEN CIRCUIT • Verify that the VSS connector is disconnected. • Turn the ignition switch to the ON position (engine off). • Inspect the voltage between VSS terminal A (wiring harness-side) and ground. • Is the voltage B+? | Yes | Go to Step 6.
No | Go to the next step.
5 | INSPECT VSS POWER CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch to the LOCK position. • Inspect for continuity between VSS terminal A (wiring harness-side) and ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 11.
6 | INSPECT VSS GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the VSS connector is disconnected. • Inspect for continuity between VSS (wiring harness-side) terminal C and ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 11.
7 | INSPECT TCM CONNECTOR FOR POOR CONNECTION • Disconnect the TCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is the connection normal? | Yes | Go to the next step.
No | Repair or replace the pin or connector, then go to Step 11.
8 | INSPECT VEHICLE SPEED SIGNAL CIRCUIT FOR OPEN CIRCUIT • Disconnect the TCM connector and VSS connector. • Inspect for continuity between VSS terminal B and TCM terminal 2P. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 11.
9 | INSPECT VEHICLE SPEED SIGNAL CIRCUIT FOR SHORT TO GROUND • Verity that the VSS connector and TCM connector are disconnected. • Inspect for continuity between TCM terminal 2P and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to the next step.
No | Replace the VSS, then go to the next step. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [FS5A-EL].)
10 | INSPECT VEHICLE SPEED SENSOR • Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL].) • Is VSS normal? | Yes | Go to the next step.
No | Repair or replace the VSS, then go to Step 11.
11 | VERIFY TROUBLESHOOTING OF DTC P0720 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the memory using the WDS or equivalent. • Warm up engine. • Drive the vehicle under the following conditions for 4.5 s or more while monitoring PIDs. - Engine coolant temp (ECT PID): 60 °C {140 °F} or more - Drive in D or M range - Frequency of input/turbine speed sensor: 800 Hz or more • Is the PENDING CODE present? | Yes | Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [FS5A-EL].)
No | No concern is detected. Go to the next step.
12 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [FS5A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection.
No | DTC troubleshooting completed.