DTC P0720:00 [FS5A-EL]

id050221817700

DTC P0720:00

VSS circuit malfunction

DETECTION CONDITION

•  The TCM detects no signal from the VSS when the following conditions are met.

―  Engine coolant temperature: more than 60 °C {140 °F}

―  D or M range

―  Intermediate speed: more than 1,500 rpm

Diagnostic support note

•  The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle.

•  The AT warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle.

•  PENDING CODE is available.

•  FREEZE FRAME DATA is available.

•  The DTC is stored in the TCM memory.

POSSIBLE CAUSE

•  VSS connector or terminal malfunction

•  Open circuit in wiring harness between VSS terminal A and AT main relay terminal C

•  Short to GND in wiring harness between VSS terminal A and AT main relay terminal C

•  Short to GND in wiring harness between VSS terminal B and TCM terminal 2P

•  Short to power supply in wiring harness between VSS terminal B and TCM terminal 2P

•  Open circuit in wiring harness between VSS terminal C and body GND

•  VSS malfunction

•  TCM connector or terminal malfunction

•  Open circuit in wiring harness between VSS terminal B and TCM terminal 2P

•  TCM malfunction

DTC P0720:00	VSS circuit malfunction
DETECTION CONDITION	• The TCM detects no signal from the VSS when the following conditions are met. ― Engine coolant temperature: more than 60 °C {140 °F} ― D or M range ― Intermediate speed: more than 1,500 rpm Diagnostic support note • The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle. • The AT warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle. • PENDING CODE is available. • FREEZE FRAME DATA is available. • The DTC is stored in the TCM memory.
POSSIBLE CAUSE	• VSS connector or terminal malfunction • Open circuit in wiring harness between VSS terminal A and AT main relay terminal C • Short to GND in wiring harness between VSS terminal A and AT main relay terminal C • Short to GND in wiring harness between VSS terminal B and TCM terminal 2P • Short to power supply in wiring harness between VSS terminal B and TCM terminal 2P • Open circuit in wiring harness between VSS terminal C and body GND • VSS malfunction • TCM connector or terminal malfunction • Open circuit in wiring harness between VSS terminal B and TCM terminal 2P • TCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
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.
1		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.
2		No	Go to the next step.
3	INSPECT VSS CONNECTOR FOR POOR CONNECTION • Switch the ignition to 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 11.
3		No	Go to the next step.
4	INSPECT VSS POWER CIRCUIT FOR OPEN CIRCUIT • Switch the ignition to ON (Engine off). • Measure the voltage between VSS terminal A (wiring harness-side) and body GND. • Is the voltage B+?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
5	INSPECT VSS CIRCUIT FOR SHORT TO GND • Switch the ignition to off. • Inspect for continuity between the following circuits: ― VSS terminal A (wiring harness-side) and body GND ― VSS terminal B (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 11.
5		No	Go to the next step.
6	INSPECT VSS SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Switch the ignition to ON (Engine off). • Measure the voltage between VSS terminal B (wiring harness-side) and body GND. • Is the voltage B+?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 11.
6		No	Go to the next step.
7	INSPECT VSS GND CIRCUIT FOR OPEN CIRCUIT • Switch the ignition to off. • Inspect for continuity between VSS terminal C (wiring harness-side) and body GND • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
8	INSPECT VSS • Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL].) • Is there any malfunction?	Yes	Replace the VSS, then go to Step 11. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [FS5A-EL].)
8		No	Go to the next step.
9	INSPECT TCM CONNECTOR FOR POOR CONNECTION • Switch the ignition to off. • Disconnect the TCM 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 11.
9		No	Go to the next step.
10	INSPECT VSS CIRCUIT FOR OPEN CIRCUIT • Switch the ignition to off. • Inspect for continuity between the VSS terminal B (wiring harness-side) and TCM terminal 2P (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
11	VERIFY TROUBLESHOOTING OF DTC P0720:00 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 until the engine coolant temperature reaches 60 °C {140 °F} or more. 3. Select the selector lever to D or M range. 4. Drive the vehicle with intermediate speed at more than 1,500 rpm for 5 s or more. • Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [FS5A-EL].)
11		No	Go to the next step.
12	VERIFY NO DTC HAS BEEN PRESENTED • Perform the “Reading DTCs Procedure”. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FS5A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FS5A-EL].)
12		No	DTC troubleshooting completed.