• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
OSS High Signal | P0722, P0723 | P0722, P0723 | P0722, P0723 | P0722, P0723 |
OSS Low Signal | -- | P0722, P0723 | -- | P0722, P0723 |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Operating Conditions: Drive vehicle, normal operating temperature Parameter Normal Range: 100-7,000 RPM | |||
Transmission OSS | 0 RPM | 0 RPM | 0 RPM |
The OSS system is a pulse generator consisting of a speed sensor assembly, located in the case extension, and a toothed vehicle speed sensor (VSS) reluctor wheel, which is pressed onto the final drive carrier assembly. As the vehicle drives forward, the VSS reluctor wheel rotates. This rotation produces a variable AC signal in the pick-up coil that is proportional to vehicle speed. The transmission control module (TCM) uses this signal in order to calculate vehicle speed, shift timing, and gear ratios.
• | No ISS DTC P0716 or P0717. |
• | The engine speed is greater than 500 RPM for 5 seconds. |
• | The engine torque is greater than 50 N·m (37 lb ft). |
• | The transmission range is not PARK or NEUTRAL. |
• | No TP sensor DTC P0120 or P0220. |
• | No OSS DTC P0723. |
• | The calc. throttle position is 8 percent or greater. |
• | The input shaft speed is 1,500-5,000 RPM. |
• | The torque converter clutch (TCC) slip speed is -20 RPM or greater. |
• | The transmission fluid temperature (TFT) is -40°C (-40°F) or greater. |
• | No ISS DTC P0716 or P0717. |
• | The engine speed is greater than 500 RPM for 5 seconds. |
• | The engine torque is greater than 50 N·m (37 lb ft). |
• | The transmission range is not PARK or NEUTRAL. |
• | No 1-2 SS electrical DTC P0974. |
• | The time since the last gear selector range change is 6 seconds or greater. |
• | The output speed is 350 RPM or greater for 2 seconds. |
• | No transmission OSS rise 175 RPM or greater to 2 seconds. |
• | The ISS changes 500 RPM or less for 2 seconds. |
The output shaft speed is 70 RPM or less for 4.5 seconds.
The output shaft speed drops greater than 420 RPM for 3.25 seconds.
• | DTC P0722 and P0723 are type B DTCs. |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM calculates output speed based on engine speed and gear ratio. |
DTC P0722 and P0723 are type B DTCs.
Automatic Transmission Controls Schematics
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 35616 GM Terminal Test Kit
⇒ | If the value is less than 100 RPM, disconnect the TCM connector. Using the J 35616 GM terminal test kit, connect the DMM between the OSS high signal and the OSS low signal circuits. |
⇒ | If the value is greater than 3,180 ohms, test the OSS high signal circuit and the OSS low signal circuit for an open. If the value is less than 1,650 ohms, test the OSS high signal and the OSS low signal circuits for a shorted together condition. |
⇒ | If the value is less than 10K ohms, repair the short to ground. |
⇒ | If the value is less than 10K ohms, repair the short to ground. |
⇒ | If the resistance is not within the specified range, replace the OSS. |
⇒ | If the AC voltage is not greater than 0.4 volt, replace the OSS. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for TCM replacement, setup, and programming.