Pinpoint Test D: TSS, Intermediate Shaft Speed and OSS Sensors
Pinpoint Tests - OSC Equipped Vehicle - TorqShift(R)
PINPOINT TEST D: TSS, INTERMEDIATE SHAFT SPEED AND OSS SENSORS
NOTE: Refer to the Transmission Vehicle Harness Connector illustration within the Transmission Connector Layouts Transmission Connector Layouts - TorqShift(R) procedure.
NOTE: Refer to the Transmission Internal Harness Connector illustration within the Transmission Connector Layouts Transmission Connector Layouts - TorqShift(R) procedure.
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to Diagnostic Parameters Identification (PID) Chart Scan Tool Testing and Procedures.
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D1 ELECTRONIC DIAGNOSTICS
- Select PARK.
- Ignition OFF.
- Check to make sure transmission vehicle harness C1385, C193, C1387 and C175T are fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PID List.
- Select and monitor the appropriate PID for the suspected sensor(s): Turbine Shaft Speed (TSS) sensor, intermediate shaft speed sensor or Output Shaft Speed (OSS) sensor.
- Can the appropriate sensor(s) be selected and monitored?
Yes
Continue to monitor the suspect sensor(s). GO to D2.
No
REPEAT procedure to enter PID. If the sensor(s) cannot be monitored using the diagnostic equipment, REFER to Computers and Control Systems for diagnosis of the PCM.
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D2 DRIVE CYCLE TEST
- While monitoring the appropriate sensor PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Does the TSS, intermediate shaft speed sensor or OSS sensor rpm PIDs increase and decrease with engine and vehicle speed?
Yes
GO to D3.
No
If the TSS, intermediate shaft speed sensor or OSS sensor rpm PID does not increase and decrease with engine and vehicle speed, the issue may be found with the vehicle harness, PCM, sensor or internal hardware. GO to D4 .
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D3 DRIVE CYCLE TEST ERRATIC
- While monitoring the appropriate sensor PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Is the TSS, intermediate shaft speed sensor or OSS sensor rpm PID signal erratic (drop to zero or near zero and return to normal operation)?
Yes
If the sensor signal is erratic, there may be an intermittent concern in the vehicle harness sensor or connector. GO to D4.
No
CLEAR the DTCs. RERUN the On-Board Diagnostic (OBD) test.
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D4 CHECK FOR SENSOR BATTERY VOLTAGE
- Ignition OFF.
- Disconnect: OSS Sensor C193.
- Disconnect: TSS/Intermediate Shaft Speed Sensor C1387.
- Inspect for damaged or pushed-out terminals, corrosion or loose wires.
- Ignition ON.
- For the OSS, measure the voltage between C1387-1, circuit LE111 (VT/GN), harness side and ground.
- For the TSS/intermediate shaft speed sensor, measure the voltage between C1387-1, circuit LE111 (VT/GN), harness side and ground.
- Is voltage greater than 10 volts?
Yes
GO to D5.
No
REPAIR the open in circuit LE111 (VT/GN). CLEAR the DTCs. TEST the system for normal operation.
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D5 CHECK THE TRANSMISSION VEHICLE HARNESS CIRCUITS FOR AN OPEN
- Disconnect: PCM C175T.
- Disconnect: Transmission Vehicle Harness C1385.
- For TSS/intermediate shaft speed sensor, measure the resistance between the speed sensor C1387 and PCM C175T using the following chart.
- For OSS, measure the resistance between OSS C193 and PCM C175T using the following chart.
- Is resistance less than 5 ohms?
Yes
GO to D6.
No
REPAIR the circuit that is open. CLEAR the DTCs. TEST the system for normal operation.
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D6 CHECK THE TRANSMISSION VEHICLE HARNESS CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between TSS/intermediate shaft speed sensor C1387, harness side and ground using the following chart.
- Measure the resistance between OSS C193, harness side and ground using the following chart.
- Is resistance greater than 10,000 ohms?
Yes
If DTC P0715, P0717, P0718, P0719, P0793 and/or P0794 were set, REPLACE the TSS/intermediate shaft speed sensor. If DTC P0720, P0721 and/or P0722 were set, REPLACE the OSS sensor. CLEAR the DTCs. TEST the system for normal operation.
No
INSPECT and REPAIR the circuit shorted to ground. If a short to ground was not found, REPLACE the PCM. TEST the system for normal operation.
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