Pinpoint Test J: OSS Sensor
Pinpoint Tests - TorqShift(R)6
PINPOINT TEST J: OSS SENSOR
NOTE: If the scan tool is unable to access the transmission PIDs, REFER to Computers and Control Systems.
NOTE: If DTCs P0706, P0707, P0708, P1702, P1705 and/or P1921 are set, diagnose those DTCs first.
NOTE: Read and record all DTCs.
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J1 DRIVE CYCLE TEST
- Enter the following diagnostic mode on the scan tool: OSS PID: OSS_SRC.
- Monitor the Output Shaft Speed (OSS) sensor PID while road testing the vehicle. Drive the vehicle so the transmission upshifts and downshifts through all the gears.
- Does the OSS sensor rpm increase and decrease with engine rpm and vehicle speed?
Yes
REFER to Shift Point Road Test Initial Inspection and Diagnostic Overview for further diagnosis.
No
GO to J2.
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J2 CHECK THE OSS SIGNAL CIRCUIT FOR AN OPEN
- Disconnect: Transmission C1623.
- Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
- Disconnect: Transmission Control Module (TCM) C1750.
- Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
- Measure the resistance between the transmission vehicle harness C1623-17 circuit RET04 (YE/OG) and the TCM C1750-51.
- Is the resistance less than 5 ohms?
Yes
GO to J3.
No
REPAIR the OSS signal circuit for an open. CLEAR the DTCs. TEST the system for normal operation.
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J3 CHECK THE OSS SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between the TCM C1750-51 circuit RET04 (YE/OG) and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J4.
No
REPAIR the OSS signal circuit for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
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J4 CHECK THE OSS SIGNAL CIRCUIT FOR A SHORT TO POWER
- Ignition ON.
- Check for voltage between the TCM C1750-51 circuit RET04 (YE/OG) and ground.
- Is any voltage present?
Yes
REPAIR the OSS signal circuit for a short to voltage. CLEAR the DTCs. TEST the system for normal operation.
No
GO to J5.
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J5 CHECK THE OSS SIGNAL CIRCUIT FOR POWER
- Ignition OFF.
- Connect: PCM C1750.
- Ignition ON.
- Check for voltage between the transmission vehicle harness C1623-17 circuit RET04 (YE/OG) and ground.
- Is voltage greater than 4.6 volts?
Yes
GO to J6.
No
REPLACE the TCM. PROGRAM the TCM with the latest calibration level. PERFORM the solenoid strategy download procedure. REFER to Solenoid Body Strategy Solenoid Body Strategy - TorqShift(R)6. TEST the system for normal operation.
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J6 CHECK THE OSS INTERNAL HARNESS FOR AN OPEN
- Remove the transmission fluid pan.
- Disconnect: 3-way OSS sensor connector.
- Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
- Measure the resistance of the OSS sensor circuits between C1623 and the 3-way OSS sensor connector component side, using the following chart.
- Is the resistance less than 5 ohms?
Yes
GO to J7.
No
REPLACE the transmission internal harness. CLEAR the DTCs. TEST the system for normal operation.
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J7 CHECK THE OSS INTERNAL HARNESS FOR A SHORT TO GROUND
- Measure the resistance of the OSS sensor circuits between C1623 and ground using the following chart.
- Is the resistance greater than 10,000 ohms?
Yes
REPLACE the OSS sensor.
No
REPLACE the transmission internal harness. CLEAR the DTCs. TEST the system for normal operation. If DTCs P0720, P0721 and/or P0722 return, REPLACE the TCM. PROGRAM the TCM with the latest calibration level. PERFORM the solenoid strategy download procedure. REFER to Solenoid Body Strategy Solenoid Body Strategy - TorqShift(R)6. TEST the system for normal operation.
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