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Pinpoint Test C : OSS (Output Shaft Speed) Sensor




Pinpoint Tests - OSC Equipped Vehicle

PINPOINT TEST C : OSS (Output Shaft Speed) SENSOR

NOTE: Refer to the Solenoid Body Leadframe-to-Output Shaft Speed (OSS) Sensor Pin Internal Circuit Diagram illustration within the Transaxle Connector Layouts procedure.

NOTE: Output Shaft Speed (OSS) codes may be a result of a bad common power or ground shared between the Transmission Range (TR) sensor, OSS (Output Shaft Speed) sensor and Turbine Shaft Speed (TSS) sensor.

C1 ELECTRONIC DIAGNOSTICS

- Check to make sure the transaxle vehicle harness C168A is fully seated, terminals are engaged in connector and in good condition before proceeding.

Have the items above been checked?

Yes
GO to C2.

No
CARRY OUT the checks. CLEAR the codes. RERUN the On-Board Diagnostic (OBD) tests.

C2 ELECTRONIC DIAGNOSTICS

- Connect the scan tool.

- Monitor the OSS (Output Shaft Speed) sensor PIDs while test driving the vehicle.

Is the OSS (Output Shaft Speed) sensor signal present and consistent?

Yes
The condition that set the DTC is intermittent and is not currently present. ERASE the codes. RERUN the OBD (On-Board Diagnostic) tests.

No
GO to C3.

C3 CHECK THE VEHICLE HARNESS FOR AN OPEN CIRCUIT

- Disconnect: Transaxle Vehicle Harness C168A.

- Disconnect: PCM Transaxle Harness C175T.

- Use a mirror to inspect both ends of the connectors for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.

- Measure the resistance for the OSS (Output Shaft Speed) sensor circuit, between the transaxle vehicle harness C168A and the PCM transaxle harness C175T, harness using the following chart.

Output Shaft Speed Sensor Circuit Transaxle Vehicle Harness PCM OSS (Output Shaft Speed) power supply LE111 (VT/GN) C168A-18 C175T-1 OSS (Output Shaft Speed) ground RET24 (BN/BU) C168A-20 C175T-36 OSS (Output Shaft Speed) sensor signal VET26 (BN/GN) C168A-19 C175T-25

Is the resistance less than 5 ohms?

Yes
GO to C4.

No
REPAIR the circuit(s) for an open. CONNECT all components. TEST the system for normal operation.

C4 CHECK THE VEHICLE HARNESS FOR A SHORT TO GROUND

- Disconnect: Transaxle Vehicle Harness C168B.

- Measure the resistance for the OSS (Output Shaft Speed) sensor circuit between the transaxle vehicle harness C168A and ground using the following chart.

Output Shaft Speed Sensor Circuit Transaxle Vehicle Harness Ground TR (Transmission Range) /OSS (Output Shaft Speed) power supply LE111 (VT/GN) C168A-18 Ground TR (Transmission Range) /OSS (Output Shaft Speed) ground RET24 (BN/BU) C168A-20 Ground OSS (Output Shaft Speed) sensor signal VET26 (BN/GN) C168A-19 Ground

Is the resistance greater than 10,000 ohms?

Yes
GO to C5.

No
REPAIR the circuit(s) for a short to ground. CONNECT all components. TEST the system for normal operation.

C5 CHECK THE VEHICLE HARNESS FOR A SHORT TO VPWR

- Check for voltage between the OSS (Output Shaft Speed) sensor circuits and the transaxle vehicle harness C168A using the following chart.

Output Shaft Speed Sensor Circuit Transaxle Vehicle Harness Ground TR (Transmission Range) /OSS (Output Shaft Speed) power supply LE111 (VT/GN) C168A-18 Ground TR (Transmission Range) /OSS (Output Shaft Speed) ground RET24 (BN/BU) C168A-20 Ground OSS (Output Shaft Speed) sensor signal VET26 (BN/GN) C168A-19 Ground

Is any voltage present?

Yes
REPAIR the circuit(s) for a short to voltage. CONNECT all components. TEST the system for normal operation.

No
GO to C6.

C6 CHECK THE SOLENOID BODY FOR AN INTERNAL OPEN CIRCUIT

- Remove the main control cover. Refer to Main Control Cover .

- Disconnect: TR (Transmission Range) Sensor.

- Disconnect: OSS (Output Shaft Speed) Sensor.

- Use a mirror to inspect both ends of the connectors for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.

- Measure the resistance of the solenoid body internal sensor power circuit between the main solenoid body leadframe connector pin 18, leadframe side and the OSS (Output Shaft Speed) sensor connector pin 4, leadframe side.





- Measure the resistance of the solenoid body internal sensor signal circuit between the main solenoid body leadframe connector pin 19, leadframe side and the OSS (Output Shaft Speed) sensor connector pin 3, leadframe side.





- Measure the resistance of the solenoid body internal sensor ground circuit between the main solenoid body leadframe connector pin 20, leadframe side and the OSS (Output Shaft Speed) sensor connector pin 1, leadframe side.





Is the resistance less than 5 ohms?

Yes
GO to C7.

No
INSTALL a new solenoid body leadframe. REFER to Solenoid Body Leadframe . CONNECT all components. TEST the system for normal operation.

C7 CHECK FOR VOLTAGE AND GROUND AT THE OSS (Output Shaft Speed) SENSOR CONNECTOR

- Connect: PCM C175T.

- Connect: Transaxle Vehicle Harness C168A.

- Ignition ON.

- Measure the voltage on the solenoid body leadframe between OSS (Output Shaft Speed) sensor connector pins 1 and 4.





Is the voltage greater than 10 volts?

Yes
INSTALL a new speed sensor. REFER to Output Shaft Speed (OSS) Sensor . TEST the system for normal operation. If the condition is still present, INSTALL a new PCM.

No
INSTALL a new PCM. CONNECT all components. TEST the system for normal operation.
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