Pinpoint Test C: OSS Sensors

Pinpoint Tests - OSC Equipped Vehicle

Pinpoint Tests

PINPOINT TEST C: OSS SENSORS

NOTE: Refer to the Transaxle Vehicle Harness Connector illustrations within the Transaxle Connector Layouts Transaxle Connector Layouts procedure.

-------------------------------------------------
C1 ELECTRONIC DIAGNOSTICS

- Check to make sure the Transmission Control Module (TCM) connector is fully seated, pins are fully engaged in the connector and in good condition before proceeding.
- Connect the scan tool.
- Ignition ON.
- Monitor the PID for the Output Shaft Speed (OSS) sensor.
- Monitor and record speed.
- Does the OSS match the vehicle speed?

Yes
CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to C2.

No
GO to C2.

-------------------------------------------------
C2 CHECK OSS SENSOR RESISTANCE

- Remove the TCM.
- Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and 20.




- Is the resistance less than 5 ohms?

Yes
CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to C3 .

No
GO to C4.

-------------------------------------------------
C3 CHECK OSS SENSOR FOR SHORT TO GROUND

- Remove the TCM.
- Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and ground.




- Measure the resistance at the transaxle bulkhead electrical connector between pin 20 and ground.




- Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new TCM and REFLASH to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to C4.

No
GO to C4.

-------------------------------------------------
C4 CHECK OSS SENSOR RESISTANCE

- Remove the transaxle side cover.
- Measure the resistance at the speed sensor electrical connector between pin 1 and 2.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new internal harness.

No
INSTALL a new transaxle assembly.

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