TJ: Output Shaft Speed (OSS) Sensor
TJ: Introduction See: TJ: Output Shaft Speed (OSS) Sensor - Introduction
TJ1 DTC P0720, P0721, P0722, P0723, AND P1900: VERIFY DRIVE CYCLE
- Monitor the OSS PID.
- Drive vehicle.
- Through all gear ranges, shift up and down.
Does PID reading increase and decrease with engine and vehicle speed?
Yes
- OSS performed as expected. GO to TJ2
.
No
- For Hall Effect Type OSS:
- KEY OFF. GO to TJ3
.
- For VR Type OSS:
- GO to TJ5
.
TJ2 VISUAL INSPECTION
- Disconnect OSS sensor.
- Inspect OSS harness for damage. Inspect OSS vehicle harness connector for damage and proper seating.
- If possible, complete wiggle test.
Have any problems been found?
Yes
No
for intermittent fault diagnosis.
TJ3 CHECK VPWR TO OSS SENSOR
- Key on.
- Disconnect OSS sensor.
- Measure VPWR circuit voltage at OSS sensor harness connector.
Is voltage greater than 10.5 volts?
Yes
.
No
- KEY OFF. Repair open circuit.
TJ4 CHECK VPWR GND TO OSS SENSOR
- Measure resistance of PWR GND circuit between OSS sensor harness connector and negative battery post.
Is resistance less than 5.0 ohms?
Yes
.
No
TJ5 CHECK HARNESS FOR SHORT TO PWR
- Key on.
- Disconnect OSS sensor.
- Measure voltage between the OSS signal circuit at the OSS sensor harness connector and ground.
Is voltage less than 1.0 volt?
Yes
.
No
- KEY OFF. REPAIR short circuit.
TJ6 CHECK HARNESS FOR OPEN
- Disconnect PCM.
- Measure resistance of the OSS signal circuit between the OSS sensor harness connector and the PCM harness connector.
- Measure resistance of the OSS SIG RTN circuit between the OSS sensor harness connector and the PCM harness connector.
Is each resistance less than 5.0 ohms?
Yes
.
No
TJ7 CHECK HARNESS FOR SHORT TO GROUND
- Measure resistance between OSS signal and SIG RTN circuits at the OSS sensor harness connector.
- Measure resistance between the OSS signal at the the OSS sensor harness connector and chassis ground.
Is each resistance greater than 10,000 ohms?
Yes
- For VR Type OSS:
- GO to TJ8
.
- For Hall Effect Type OSS:
- GO to TJ9
.
No
TJ8 CHECK RESISTANCE OF OSS SENSOR
- Measure resistance of the OSS sensor between the pins of the OSS sensor.
Is resistance between 450 and 750 ohms?
Yes
No
TJ9 CHECK OSS SIGNAL OUTPUT TO PCM, HALL TYPE OSS
- Disconnect PCM.
- Raise vehicle to allow rotation of the front drive wheel.
- Key on, transmission in neutral.
- Measure voltage between OSS+ and PWR GND circuits at the PCM harness connector while slowly rotating the drive wheel.
Note: Opposite wheel must be held stationary.
- The voltage should rise above 5.0 volts and fall below 1.0 volts in a regular cycle. Observe several cycles.
Does the OSS output voltage rise and fall as specified?
Yes
No
- REPLACE OSS sensor. REFER to the diagnostic/repair information for manual transmissions.
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