DTC P0720, P0721, P0722 [5R55S]

id0502c1806300

DTC P0720

Output shaft speed (OSS) sensor malfunction

DTC P0721

Output shaft speed (OSS) sensor signal noise

DTC P0722

Output shaft speed (OSS) sensor signal is not input.
DETECTION CONDITION
•  P0720: TCM detects insufficient OSS sensor signal while driving
•  P0721: TCM detects intermittent OSS sensor signal input while driving
•  P0722: TCM detects that OSS sensor is not input while driving
POSSIBLE CAUSE
•  OSS sensor malfunction.
•  Short to ground in wiring harness between OSS sensor terminal A (wiring harness-side) and TCM terminal AG (wiring harness-side).
•  Open circuit in wiring harness between OSS sensor terminal A (wiring harness-side) and TCM terminal AG (wiring harness-side).
•  Open circuit in wiring harness between OSS sensor terminal B (wiring harness-side) and TCM terminal AD (wiring harness-side).
•  Damaged connectors between OSS sensor and TCM.
•  TCM malfunction.

Diagnostic procedure

STEP

INSPECTION

ACTION
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 Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT OSS SENSOR CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch to the LOCK position.
•  Disconnect the OSS sensor 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 connector and/or terminal, then go to Step 9.
4
INSPECT OSS SENSOR CIRCUIT FOR SHORT TO GROUND
•  Inspect for continuity between OSS sensor connector A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 9.
No
Go to the next step.
5
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 connector and/or terminals, then go to Step 9.
6
INSPECT OSS SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Inspect the following OSS sensor terminals (wiring harness-side) and TCM terminals (wiring harness-side):
―  A and AG
―  B and AD
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 9.
7
INSPECT OSS SENSOR
•  Inspect the OSS sensor.
•  Is OSS sensor normal?
Yes
Go to the next step.
No
Replace the OSS sensor, then go to the next step.
(See OUTPUT SHAFT SPEED (OSS) SENSOR REMOVAL/INSTALLATION [5R55S].)
8
VERIFY TROUBLESHOOTING OF DTC P0720, P0721 OR P0722 COMPLETED
•  Make sure to reconnect all the disconnected connectors.
•  Clear the DTC from memory using the IDS/PDS.
•  Perform the “After Repair Procedure”.
•  Are any DTCs present?
Yes
Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [5R55S].)
No
Go to the next step.
9
VERIFY DTCS
•  Are DTCs except for P0720, P0721 and P0722 output?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [5R55S].)
No
DTC troubleshooting completed.