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DTC P0720

BHE050201026W13

DTC P0720 | Vehicle speed sensor (VSS) malfunction (open circuit/short to ground)
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DETECTION CONDITION | • While driving in D range at turbine speed of 2,000 rpm or more (25.5 s or more after shifting to D range), vehicle speed signal is 5 km/h {3 mph} or less for 3.5 s or more. Diagnostic support note: • This is a continuous monitor (CCM). • MIL illuminates if TCM detects the above malfunction condition during the first drive cycle. • PENDING CODE is not available. • FREEZE FRAME DATA is available. • AT warning light illuminates. • DTC is stored in TCM memory.
POSSIBLE CAUSE | • VSS malfunction • Short to ground in wiring harness between VSS terminal A and TCM terminal 2K • Open circuit in wiring harness between VSS terminal A and TCM terminal 2K • Open circuit in wiring harness between VSS terminal B and ignition switch (IG1) • 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 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 REPAIR 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). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair or replace the connector and/or terminal, then go to Step 10.
4 | INSPECT VSS POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (engine off). • Inspect the voltage at VSS connector terminal B. • Is the terminal voltage B+? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 10.
5 | INSPECT VSS GROUND CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the LOCK position. • Inspect for continuity between the VSS (wiring harness-side) terminal C and body ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 10.
6 | INSPECT TCM CONNECTOR FOR POOR CONNECTION • Disconnect the TCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair or replace the connector and/or terminal, then go to Step 10.
7 | INSPECT VSS SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the VSS (wiring harness-side) terminal A and TCM (wiring harness-side) terminal 2K. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 10.
8 | INSPECT VSS SIGNAL CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the VSS (wiring harness-side) terminal A and body ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 10.
9 | INSPECT VSS • Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION.) • Is the VSS normal? | Yes | Go to the next step.
No | Replace the VSS, then go to the next step. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION.)
10 | VERIFY TROUBLESHOOTING OF DTC P0720 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the TCM memory using the WDS or equivalent. • Drive the vehicle with vehicle speed of 5 km/h {3 mph} or less and turbine speed of 2,000 rpm or more for 3.5 s or more • Is the same DTC present? | Yes | Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION.)
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [RC4A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [RC4A-EL].)
No | DTC troubleshooting completed.