Pinpoint Test C : P0720, P0721, P0722, P0723
- Refer to Transmission Controls - DPS6
for schematic and connector information.
Normal Operation and Fault Conditions
The OSS sensor is a magnetic pickup that measures the rotating speed of the output shaft and sends this signal to the TCM. The OSS sensor is used for TCC scheduling and shift time. The rotation direction is not measured. The OSS sensor is located in the transmission housing above the rotor in the differential. If DTC P1934 or P193F are set along with OSS sensor DTC, follow the OSS sensor diagnostic routines. If DTC U0402 sets along with P1934 then the TCM is reporting invalid data to the PCM.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition TCM P0720:00 Output Shaft Speed Sensor Circuit: No Sub Type Information OSS sensor fault detected. TCM P0721:00 Output Shaft Speed Sensor Circuit Range/Performance: No Sub Type Information Erratic OSS sensor signal - noisy signal, out of range high, or not plausible. Detection of this fault is disabled if a power supply P06A8 or circuit fault P0720 is present. TCM P0722:00 Output Shaft Speed Sensor Circuit No Signal: No Sub Type Information OSS sensor failed to 0 speed when the ABS wheel speed sensors indicate vehicle speed. Detection of this fault is disabled if a power supply P06A8 or circuit fault P0720 is present. TCM P0723:00 Output Shaft Speed Sensor Circuit Intermittent: No Sub Type Information This DTC sets along with P0720, P0721 and/or P0722. Used to turn on the wrench light. Possible Sources
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
- OSS sensor
- TCM
- C1 READ AND RECORD ALL DTCS
- Using the diagnostic scan tool, retrieve all DTCs.
Are DTCs P0720, P0721, P0722, and/or P0723 present?
Yes GO to C2 No CARRY OUT the Speed Sensor Test, REFER to: Transmission Control Module (TCM) Adaptive Learning . - C2 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR POWER CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect OSS Sensor C193 .
- Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C193-1 Ground
Is the voltage greater than 11 volts?
Yes GO to C5 No GO to C3 - C3 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR POWER CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect TCM C1750B .
- Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
Is the resistance less than 3 ohms?
Yes GO to C4 No REPAIR the circuit. - C4 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR POWER CIRCUIT FOR A SHORT TO GROUND
- Measure:
Positive Lead Measurement / Action Negative Lead C193-1 Ground
Is the resistance greater than 10, 000 ohms?
Yes INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . PROGRAM the TCM with the latest calibration, REFER to: Transmission Control Module (TCM) Adaptive Learning . No REPAIR the circuit. - Measure:
- C5 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR RETURN CIRCUIT
- Ignition ON.
Is the voltage greater than 11 volts?
Yes INSTALL a new OSS sensor. REFER to: Output Shaft Speed (OSS) Sensor . CARRY OUT the Speed Sensor Test, REFER to: Transmission Control Module (TCM) Adaptive Learning . No GO to C6 - C6 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR RETURN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect TCM C1750B .
- Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
Is the resistance less than 3 ohms?
Yes GO to C7 No REPAIR the circuit. - C7 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR RETURN CIRCUIT FOR A SHORT TO POWER
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C193-2 Ground
Is any voltage detected?
Yes REPAIR the circuit. No INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . PROGRAM the TCM with the latest calibration, REFER to: Transmission Control Module (TCM) Adaptive Learning .