DTC P0720 [JA5A-EL]

BME050218901211

DTC P0720

Vehicle speedometer sensor (VSS) malfunction (open/short)

DETECTION CONDITION

• If the vehicle speedometer sensor signal is 150 rpm or less while the intermediate sensor signal is 1,400 rpm or greater in D, S, or L range for 2 s or more, the TCM determines that there is a malfunction.
Diagnostic support note:
• This is a continuous monitor (CCM).
• The MIL illuminates if the TCM detects the above malfunction conditions in two consecutive drive cycles.
• PENDING CODE is available.
• FREEZE FRAME DATA is available.
• The HOLD indicator light flashes.
• The DTC is stored in the TCM memory.

POSSIBLE CAUSE

• Open circuit in wiring harness between vehicle speedometer sensor terminal B and TCM terminal 1M
• Open circuit in wiring harness between vehicle speedometer sensor terminal A and TCM terminal 1V
• Short to ground in wiring harness between vehicle speedometer sensor terminal B and TCM terminal 1M
• Short to ground in wiring harness between vehicle speedometer sensor terminal A and TCM terminal 1V
• Vehicle speedometer sensor malfunction
• Damaged connectors between vehicle speedometer sensor to TCM
• TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

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 PID 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 TERMINAL COMPONENT NO.2 (8-PIN) CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch to the LOCK position.
• Disconnect the terminal component No.2 (8-pin) connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair or replace the terminals, then go to Step 12.
4
INSPECT VEHICLE SPEEDOMETER SENSOR RESISTANCE
• Measure the resistance between the terminal component No.2 (8-pin) (transaxle case side).
• Is the resistance within 513-627 ohms between terminal component No.2 (8-pin) terminal A and B (transaxle case side)?
Yes
Go to the next step.
No
Go to Step 8
5
INSPECT TCM CONNECTOR FOR POOR CONNECTION
• Disconnect the TCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair the terminals, then go to Step 12.
6
INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CIRCUIT FOR OPEN CIRCUIT
• Inspect the terminal component No.2 (8-pin) terminals (wiring harness-side) and TCM terminals (wiring harness-side).
- A and 1M
- B and 1V
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 12.
7
INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CIRCUIT FOR SHORT TO GROUND
• Inspect the terminal component No.2 (8-pin) terminal (wiring harness-side) and body ground.
- A and body ground
- B and body ground
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 12.
No
Go to Step 12.
8
INSPECT COUPLER COMPONENT (8-PIN) CONNECTOR FOR POOR CONNECTION
• Disassemble the control valve body cover.
• Disconnect the coupler component (8-pin) connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair the terminals, then go to Step 12.
9
INSPECT VEHICLE SPEEDOMETER SENSOR RESISTANCE
• Measure the resistance between coupler component (8-pin) (transaxle case side).
• Is the resistance within 513-627 ohms between coupler component (8-pin) terminal H and F (part side)?
Yes
Repair or replace terminal component, then go to Step 12.
No
Go to the next step.
10
INSPECT VEHICLE SPEEDOMETER SENSOR CONNECTOR FOR POOR CONNECTION
• Disassemble the transaxle.
• Disconnect the vehicle speedometer sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair the terminals, then go to Step 12.
11
INSPECT VEHICLE SPEEDOMETER SENSOR RESISTANCE
• Measure the resistance between the vehicle speedometer sensor.
• Is the resistance within 513-627 ohms between vehicle speedometer sensor connector terminal A and B (part side)?
Yes
Repair or replace the coupler component, then go to the next step.
No
Replace the vehicle speedometer sensor, then go to the next step.
12
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 the vehicle speed 40 km/h {25 mph} or above for 2 s or more.
• Is the same DTC present?
Yes
Replace the TCM, then go to the next step.
No
Go to the next step.
13
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.