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| • | 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 provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Output Speed Sensor Signal | P0722, P0723, P077C | P0722, P0723, P077C | P0722, P0723, P077D | - |
Output Speed Sensor Supply Voltage | P0722, P0723, P077C | P0722, P0723, P077C | -- | -- |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Drive vehicle, normal operating temperature Parameter Normal Range: 0-7,000 RPM | |||
Output Speed Sensor Supply Voltage | 0 RPM | 0 RPM | 0 RPM |
Output Speed Sensor Signal | 0 RPM | 0 RPM | 0 RPM |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Key ON, Engine OFF or Engine running, normal operating temperature Parameter Normal Range: OK | |||
Output Speed Sensor Signal | OK | OK | OK |
Output Speed Sensor Supply Voltage | Out of Range | Out of Range | Out of Range |
The output speed sensor (OSS) is a hall-effect type sensor. The OSS mounts to the automatic transmission case assembly and connects to the control solenoid valve assembly through a 2-wire harness and connector. The sensor faces the park gear teeth. The sensor receives battery voltage on the OSS supply voltage circuit from the transmission control module (TCM). As the output shaft rotates, the sensor produces a signal frequency based on the park gear teeth. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses the OSS signal to determine line pressure, transmission shift patterns, vehicle speed and gear ratio.
| • | DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0722, or P0723 is not set. |
| • | The ignition voltage is 9.0 volts or greater. |
| • | The engine speed is greater than 400 RPM for 5 seconds. |
| • | The engine torque signal is valid. |
| • | The throttle position signal is valid. |
| • | The transmission input speed is between 1,000-8,191 RPM. |
| • | The calculated throttle position is greater than 8 percent. |
| • | The engine torque is greater than 30 N·m (22 lb ft). |
| • | The TFT is greater than -40°C (-40°F). |
| • | DTC P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0723, P0973, P0974, P0976, or P0977 is not set. |
| • | The ignition voltage is 9.0 volts or greater. |
| • | Greater than 5 seconds since last range change. |
| • | The engine torque signal is valid. |
| • | The throttle position signal is valid. |
| • | DTC P077D is not set. |
| • | The ignition voltage is 9.0 volts or greater. |
| • | DTC P077C is not set. |
| • | The ignition voltage is 9.0 volts or greater. |
The transmission output speed is 35 RPM or less for 5 seconds.
| • | The transmission output speed is 105 RPM or greater. |
| • | The transmission output speed drops 1,000 RPM for greater than 3 seconds and does not recover. |
The transmission OSS analogue signal voltage is 0.25 volts or less for 4 seconds.
The transmission OSS analogue signal voltage is 4.75 volts or greater for 4 seconds.
| • | DTC P0722 is a Type A DTC. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM commands maximum line pressure. |
| • | The TCM forces the torque converter clutch (TCC) OFF. |
| • | The TCM limits the transmission to reverse and 2nd gear. |
| • | The TCM inhibits Tap-Up/Tap-Down functions. |
| • | The TCM inhibits manual up, manual down shifts with the shift selector. |
| • | DTCs P0723, P077C, and P077D are Type A DTCs. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM forces TCC OFF. |
| • | The TCM commands the high side driver OFF. |
| • | The TCM commands maximum line pressure. |
| • | The TCM enables torque management. |
| • | The TCM limits the transmission to reverse and 5th gear. |
| • | The TCM inhibits Tap-Up/Tap-Down functions. |
| • | The TCM inhibits manual up, manual down shifts with the shift selector. |
DTCs P0722, P0723, P077C, and P077D are Type A DTCs.
Inspect the OSS, harness, and connector for metallic debris and proper alignment of the OSS with the park gear. Proper torque of the OSS mounting bolt is critical to proper OSS operation.
Automatic Transmission Controls Schematics
| • | Electronic Component Description for output speed sensor (OSS) |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| • | DT-48616-10 Adapter Harness |
| • | EL 38522 Variable Signal Generator |
For equivalent regional tools, refer to Special Tools .
Note: You must perform the Circuit/System Verification first.
| ⇒ | If not within the specified range, replace the Q8 control solenoid valve assembly. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection . |
| • | Refer to Control Module References for control solenoid valve assembly replacement, set-up, and programming. |
| • | Perform the Transmission Adaptive Values Learn following all transmission related repairs. |
| • | Perform the Input and Output Speed Sensor Removal and the Input and Output Speed Sensor Installation . |
| © Copyright Chevrolet. All rights reserved |
| © Copyright Chevrolet. All rights reserved |
