DTC P0720 (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL]

id0502a18098a7

DTC P0720

Vehicle speed sensor (VSS) circuit malfunction

DETECTION CONDITION

• Vehicle speed signal not input after the following conditions are met and 4.5 seconds or more have passed
- D range switch ON.
- P and N position of TR switch OFF.
- Engine coolant temperature 60 °C {140 °F} or above.
- Turbine speed 1,500 rpm or above.
Diagnostic support note:
• This is a continuous monitor (CCM).
• MIL illuminates if TCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the TCM.
• PENDING CODE is available if TCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• AT warning light illuminates.
• DTC is stored in the TCM memory.

POSSIBLE CAUSE

• VSS malfunction.
• Open circuit between VSS terminal B and TCM terminal 2P.
• Short to ground between VSS terminal B and TCM terminal 2P.
• Open circuit between VSS terminal A and fuse block connector terminal.
• Open circuit between VSS terminal C and body ground.
• Damaged connectors between VSS and TCM.
• TCM malfunction.

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has FREEZE FRAME PID DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME PID DATA on repair order, then go to next step.
2

VERIFY RELATED SERVICE INFORMATION AVAILABILITY

• Check for related Service Bulletins availability.
• Is any related repair Information available?
Yes
Perform repair or diagnosis according to available repair Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3

INSPECT VSS CONNECTOR FOR POOR CONNECTION

• Turn ignition key to OFF.
• Disconnect VSS connector.
• Check for poor connection (damaged/pulled-out terminals, corrosion, etc.).
• Is connection okay?
Yes
Go to next step.
No
Repair or replace pin or connector, then go to Step 11.
4

INSPECT VSS POWER CIRCUIT FOR OPEN CIRCUIT

• Verify that VSS connector is disconnected.
• Turn ignition key to ON (engine off).
• Check voltage between VSS terminal A (harness-side) and ground
• Is voltage reading B+?
Yes
Go to next step.
No
Repair or replace harness, then go to Step 11.
5

INSPECT VSS GROUND CIRCUIT FOR OPEN CIRCUIT

• Turn ignition key to OFF.
• Verify that VSS connector is disconnected.
• Check for continuity between VSS terminal C (harness-side) and ground
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness, then go to Step 11.
6

INSPECT TCM CONNECTOR FOR POOR CONNECTION

• Disconnect TCM connector.
• Check for poor connection (damaged/pulled-out terminals, corrosion, etc.).
• Is connection okay?
Yes
Go to next step.
No
Repair or replace pin or connector, then go to Step 11.
7

INSPECT VEHICLE SPEED SIGNAL CIRCUIT FOR OPEN CIRCUIT

• Disconnect TCM connector and VSS connector.
• Inspect for continuity between VSS terminal B and TCM terminal 2P.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness, then go to Step 11.
8

INSPECT VEHICLE SPEED SIGNAL CIRCUIT FOR SHORT TO GROUND

• Verify that VSS connector and TCM connector are disconnected.
• Inspect for continuity between TCM harness side connector and body ground.
• Is there continuity?
Yes
Repair or replace harness, then go to Step 11.
No
Go to next Step.
9

INSPECT VEHICLE SPEEDOMETER SENSOR

• Inspect VSS.
• Is VSS okay?
Yes
Go to next Step.
No
Repair or replace VSS, then go to Step 11.
10

INSPECT TCM CONNECTOR FOR POOR CONNECTION

• Disconnect TCM connector.
• Check for poor connection (damaged/pulled-out terminals, corrosion, etc.).
• Is connection okay?
Yes
Go to next step.
No
Repair or replace pin or connector, then go to Step 11.
11
VERIFY TROUBLESHOOTING OF DTC P0720 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Warm up engine.
• Drive vehicle under following conditions for 4.5 seconds or more while monitoring PIDs.
- Engine coolant temp: 60 °C {140 °F} or above
- Drive in M range
- Frequency of input/turbine speed sensor: 800 Hz or above
• Is pending code present?
Yes
Replace TCM, then go to next step.
No
No concern is detected. Go to next step.
12
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Are any DTCs present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.