P0721
P0721Component Location:
General Description
The OUTPUT SPEED SENSOR outputs waveform signals according to the revolutions of the output shaft of the transmission. The Output Speed Sensor is installed in front of the Parking Gear to determine the Parking Gear rpms by counting the frequency of the pulses. This value, together with the throttle position data, is mainly used to decide the optimum gear position.
DTC Description
The TCM sets this code if the calculated value of the signals is noticeably different from the value calculated, using the Vehicle Speed Sensor output, when the vehicle is running faster than 18.6 MPH (30 km/h). The TCM will initiate the fail safe function if this code is detected.
DTC Detecting Condition:
Specification:
Schematic Diagram:
Signal Waveform:
Monitor Scantool Data
1. Connect scantool to data link Connector (DLC)
2. Engine "ON".
3. Monitor the "OUTPUT SPEED SENSOR" parameter on the scantool
4. Driving at speed of over 5 km/h
Specification : Increasing Gradually
5. Does "OUTPUT SPEED SENSOR" follow the reference data?
YES
a. Fault is intermittent caused by poor contact in the sensor's and/or PCM/TCM's connector or was repaired and PCM/TCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO
a. Go to "W/Harness Inspection" procedure
Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
a. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
a. Go to "Signal Circuit Inspection" procedure
Signal Circuit Inspection
Check "OUTPUT SPEED SENSOR SIGNAL CIRCUIT 1"
1. Ignition "ON" & Engine "OFF".
2. Disconnect the "C106-1" connector
3. Measure voltage between terminal "10" of the C106-1 harness connector and chassis ground.
Specification : approx. 5 V
4. Is voltage within specifications?
YES
a. Go to "OUTPUT SPEED SENSOR SIGNAL CIRCUIT 2" as below
NO
a. Check for open or short in harness. Repair as necessary and Go to "Verification of Vehicle Repair" procedure
b. If signal circuit in harness is OK, Go to "Component Inspection" procedure.
Check "OUTPUT SPEED SENSOR SIGNAL CIRCUIT 2"
5. Remove "OIL PAN"
6. Connect the "C106-1" connector
7. Ignition "ON" & Engine "OFF".
8. Disconnect the "OUTPUT SPEED SENSOR" connector
9. Measure voltage between terminal "WHITE COLOR" of the OUTPUT SPEED SENSOR harness connector and chassis ground.
Specification : approx. 5 V
10. Is voltage within specifications?
YES
a. Go to "Power circuit Inspection" procedure
NO
a. Check for open or short in harness(C06-1-TRANSMISSION RANGE SWITCH). Repair as necessary and Go to "Verification of Vehicle Repair" procedure
b. If signal circuit in harness is OK, Replace "TRANSMISSION RANGE SWITCH" as necessary and Go to "Verification of Vehicle Repair" procedure
Power Supply Circuit Inspection
1. Remove "OIL PAN"
2. Connect the "C06-1" connector
3. Ignition "ON" Engine "OFF".
4. Disconnect the "OUTPUT SPEED SENSOR" connector
5. Measure voltage between terminal "PINK COLOR" of the OUTPUT SPEED SENSOR harness connector and chassis ground.
Specification : approx. 12 V
6. Is voltage within specifications?
YES
a. Go to "Ground circuit Inspection" procedure
NO
a. Replace "TRANSMISSION RANGE SWITCH" as necessary and Go to "Verification of Vehicle Repair" procedure
Ground Circuit Inspection
1. Ignition "OFF" & Engine "OFF".
2. Remove "OIL PAN"
3. Connect the "C06-1" connector
4. Disconnect the "OUTPUT SPEED SENSOR" connector
5. Measure resistance between terminal "BLACK COLOR" of the OUTPUT SPEED SENSOR harness connector and chassis ground.
Specification : approx. 0 ohm
6. Is resistance within specifications?
YES
a. Substitute with a known-good "OUTPUT SPEED SENSOR" and check for proper operation. If the problem is corrected, replace "OUTPUT SPEED SENSOR" as necessary and go to "Verification of Vehicle Repair" procedure.
NO
a. Replace "TRANSMISSION RANGE SWITCH" as necessary and Go to "Verification of Vehicle Repair" procedure
Component Inspection
CHECK TCM
1. Ignition "ON" & Engine "OFF".
2. Disconnect "C106-1" connector.
3. Install scantool and select a SIMU-SCAN,
4. Simulate frequency to OUTPUT SPEED SENSOR signal circuit.
5. Is "OUTPUT SPEED SENSOR" signal value changed according to simulation frequency?
YES
a. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
a. Substitute with a known-good TCM and check for proper operation. If the problem is corrected, replace TCM as necessary and go to "Verification of Vehicle Repair" procedure.
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present?
YES
a. Go to the applicable troubleshooting procedure.
NO
a. System performing to specification at this time.