For 1990-2009 cars
Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice

### Circuit Description

The output speed sensor is a magnetic pick-up which generates a speed signal from a toothed wheel having 12 teeth. The TCM calculates the output shaft RPM from this signal.

### Conditions for Running the DTC

• | The gear position is not equal to P, R, N.

• | The engine speed is greater than 3000 RPM.

### Conditions for Setting the DTC

The output speed is 0 RPM.

### Action Taken When the DTC Sets

• | The TCM illuminates the Service Transmission Lamp (STL) and sends a MIL Request to the ECM on the second consecutive drive trip that the diagnostic runs and fails. The ECM then illuminates the MIL.

• | The ECM records the operating conditions in the Freeze Frame at the time of the MIL Request from the TCM.

• | The transmission operates in the Default Mode.

### Conditions for Clearing the MIL/DTC

• | The TCM turns off the STL as soon as the fault is no longer present.

• | The ECM turns off the MIL after three consecutive drive trips during which the TCM sends no MIL Request.

• | A History DTC clears after forty consecutive warm-up cycles, if no failures are present by this diagnostic or any other emission related diagnostic.

• | The scan tool clears the MIL/DTC.

### Diagnostic Aids

Use the Connector Test Adapter Kit J 35616-A for any test that requires probing the TCM harness connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals.

Check for the following conditions:

• | Poor connections at the TCM or at the component. Inspect the harness connectors for any backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Engine Electrical, Troubleshooting Procedures, Checking Terminal Contact for proper procedure.

• | Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving any related connectors and any wiring harnesses. A change in the display may help to locate the fault.

### Test Description

The number(s) below refer to the step number(s) on the Diagnostic Table.

1. If the Output Speed is greater than 0 RPM,the sensor is generating a signal.The Output Speed is the rotational speed of the driveshaft.A rough comparison can be made with Engine Speed when the transmission is in Drive 3 and the drive wheels are spinning freely.

#### DTC P0722 - Transmission Output Speed Sensor Circuit

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check
2 | For vehicles with independent suspension: Notice: Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel.

1. Turn off the ignition.
2. Raise the drive wheels.
3. Start the engine.
4. Turn off the traction control system (if so equipped).
5. Allow the engine to idle in gear.

Is the scan tool indicating the Output Speed?

--

Refer to Diagnostic Aids

Go to Step 3

3 |

1. Connect the Signal Generator Tester J 33431-B to the Output Speed sensor harness connector (one terminal connected to the signal circuit and the other to ground).
2. Turn on the ignition.
3. Turn on the tester.
4. Set the Signal Generator Tester J 33431-B in order to generate a VSS signal.

Is the scan tool indicating Output Speed?

--

Go to Step 13

Go to Step 4

4 |

1. Turn off the ignition.
2. Disconnect the TCM.
3. Use the test light J 35616-200 connected to ground in order to probe the sensor signal high circuit.

Does the test light illuminate?

--

Go to Step 10

Go to Step 5

5 | Use the DVM J 39200 in order to check the harness for continuity of the sensor signal high circuit from the TCM harness connector to the sensor harness connector. Is the continuity indicated? | -- | Go to Step 6 | Go to Step 11
6 | Use the DVM J 39200 in order to check the harness for continuity between the sensor signal high circuit and the ground. Is the continuity indicated? | -- | Go to Step 12 | Go to Step 7
7 | With the test light J 35616-200 connected to ground, probe the sensor signal low circuit. Does the test light illuminate? | -- | Go to Step 10 | Go to Step 8
8 | Use the DVM J 39200 in order to check the harness for continuity of the sensor signal low circuit from the TCM harness connector to the sensor harness connector. Is the continuity indicated? | -- | Go to Step 9 | Go to Step 11
9 | Use the DVM J 39200 in order to check the harness for continuity between the sensor signal low circuit and ground. Is the continuity indicated? | -- | Go to Step 12 | Go to Step 15
10 | Repair the circuit shorted to B+. Is the action complete? | -- | Go to Step 17 | --
11 | Repair the open/high resistance circuit. Is the action complete? | -- | Go to Step 17 | --
12 | Repair the circuit shorted to ground. Is the action complete? | -- | Go to Step 17 | --
13 | Check the sensor harness connector for a poor connection or a poor terminal tension. Refer to Engine Electrical,Troubleshooting Procedures,Checking Terminal Contact for proper procedure. Was a problem found and corrected? | -- | Go to Step 17 | Go to Step 14
14 | Replace the sensor. Refer to Automatic Transmission,On Vehicle Service, Output Speed Sensor . Is the action complete? | -- | Go to Step 17 | --
15 | Check the TCM harness connector for a poor connection or a poor terminal tension. Refer to Engine Electrical, Troubleshooting Procedures, Checking Terminal Contact for proper procedure. Was a problem found and corrected. | -- | Go to Step 17 | Go to Step 16
16 | Replace the TCM. Refer to Automatic Transmission, On Vehicle Service, TCM . Is the action complete? | -- | Go to Step 17 | --
17 |

1. Clear the DTCs with the scan tool.
2. Turn off the ignition for 15 seconds.
3. Start the engine.
4. Operate the vehicle within the conditions required for this diagnostic to run. Refer to Conditions for Running the DTC.
5. Check for any DTCs.

Is DTC P0722 set?

--

Go to Step 2

Go to Step 18

18 | Were there any additional DTCs noted during the Powertrain or Transmission OBD System Check that have not been diagnosed? | -- | Go to the applicable DTC table | Go to Step 19
19 | Does the Transmission now function properly? | -- | System OK | Go to Functional Test