Diagnostic guide for P0722

Diagnostic Guide for P0722 - Output Shaft Speed Sensor No Signal

The P0722 code indicates that the Powertrain Control Module (PCM) is not receiving a signal from the Output Shaft Speed (OSS) Sensor. This guide will help you diagnose the issue systematically to determine the root cause of the problem, which may involve the sensor itself, its wiring, or the PCM.

✓

Difficulty

Intermediate

⏱

Estimated Time

30-60 Minutes

Estimated Diagnostic Cost

$0-$100

Typical shop charge to perform this diagnostic process. Repair parts and labor are not included.

⚙

Tools Needed

OBDII scanner, multimeter, wiring diagram, basic hand tools

Safety Notes

Ensure the vehicle is on a flat surface and securely supported if lifting is required. Be cautious of moving parts and hot engine components during diagnosis.

Step 1

Check for Existing Codes

Instruction Connect the OBDII scanner to the vehicle's diagnostic port and retrieve any stored trouble codes.

Expected result The scanner displays the P0722 code along with any other related codes.

If Pass If P0722 is present, proceed to the next step to inspect the OSS sensor.

If Fail If P0722 is not present, check for other codes that may indicate related issues with the transmission or PCM.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 2

Inspect the OSS Sensor and Wiring

Instruction Locate the OSS sensor and visually inspect it for any signs of damage, corrosion, or loose connections. Check the wiring harness for frays or shorts.

Expected result The OSS sensor and wiring should appear intact without any visible damage.

If Pass If everything looks good, proceed to test the sensor's electrical output.

If Fail If you find any damage, repair or replace the affected components before retesting.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 3

Test the OSS Sensor Output

Instruction Using a multimeter, measure the voltage output of the OSS sensor while the vehicle is in motion or with the engine running.

Expected result The sensor should produce a voltage signal that varies with the speed of the output shaft.

If Pass If a proper signal is detected, the sensor is functioning correctly; proceed to check the PCM.

If Fail If no signal is detected, the OSS sensor may be faulty and should be replaced.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 4

Check the PCM Input

Instruction With the multimeter, check the input signal at the PCM connector for the OSS sensor.

Expected result The PCM should receive a voltage signal corresponding to the OSS sensor output.

If Pass If the PCM receives the signal, the issue may lie within the PCM itself; consider further diagnostics or replacement.

If Fail If the PCM does not receive a signal, inspect the wiring between the OSS sensor and the PCM for continuity and shorts.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 5

Perform a Continuity Test

Instruction With the multimeter, perform a continuity test on the wiring harness between the OSS sensor and the PCM.

Expected result There should be continuity with no shorts or open circuits.

If Pass If continuity is confirmed, the wiring is intact; consider the possibility of a faulty PCM.

If Fail If there is no continuity, repair the wiring as necessary and retest the system.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.