Pinpoint Test E: OSS Sensor

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST E: OSS SENSOR

NOTE: Refer to the Output Shaft Speed (OSS) Sensor Harness Connector illustration within the Transmission Connector Layouts Transmission Connector Layouts procedure.

NOTE: Refer to the Transmission Vehicle Harness Connector illustration within the Transmission Connector Layouts Transmission Connector Layouts procedure.

NOTE: Read and record all DTCs.

-------------------------------------------------
E1 ELECTRONIC DIAGNOSTICS


- Select PARK.
- Ignition OFF.
- Check to make sure the transmission vehicle harness C1274 and the Output Shaft Speed (OSS) sensor C1107 are fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
- Connect the scan tool.
- Ignition ON.
- Access the transmission PIDs.
- Is the scan tool able to access the transmission PIDs?

Yes
GO to E2.

No
REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to Computers and Control Systems for diagnosis of PCM.

-------------------------------------------------
E2 DRIVE CYCLE TEST


- While monitoring the OSS_SRC PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Does the OSS_SRC PID increase and decrease with vehicle speed?

Yes
CLEAR the DTCs. ROAD TEST to verify if concern is still present. If concern is still present, REFER to Diagnosis By Symptom Diagnosis By Symptom.

No
If the OSS_SRC PID does not increase and decrease with vehicle speed or if the sensor signal is erratic or the sensor signal is consistent/unchanging output, GO to E3.

-------------------------------------------------
E3 CHECK THE TRANSMISSION VEHICLE HARNESS FOR OPENS


- Ignition OFF.
- Disconnect: PCM C175T.
- Disconnect: OSS Sensor C1107.
- Measure the resistance between PCM C175T and OSS sensor C1107, harness side using the following table.









- Is the resistance less than 5 ohms?

Yes
GO to E4.

No
REPAIR the transmission vehicle harness circuit for an open. CLEAR the DTCs. TEST the system for normal operation.

-------------------------------------------------
E4 CHECK THE TRANSMISSION VEHICLE HARNESS FOR SHORT TO GROUND


- Measure the resistance between PCM C175T-3, circuit 136 (DB/YE), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to E5.

No
REPAIR the transmission vehicle harness circuit 136 (DB/YE) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

-------------------------------------------------
E5 CHECK RESISTANCE OF THE OSS SENSOR


- Measure the resistance between OSS sensor pins 1 and 2, component side.




- Is the resistance between 400-500 ohms at 25°C (77°F)?

Yes
REPLACE the PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

No
REPLACE the OSS sensor. CLEAR the DTCs. TEST the system for normal operation.

-------------------------------------------------