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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 |
|---|---|---|---|---|
OSS Supply Voltage | P215C | P0721, P215C | P0721, P215C | P077B, P0721, P215C |
OSS Signal | P215C | P0721, P215C | P0721, P215C | P077B, P0721, P215C |
Circuit | Normal Range | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature | |||
OSS Signal | 0-7,000 RPM | 0 RPM | 0 RPM |
OSS Supply Voltage | - | 0 RPM | 0 RPM |
Circuit | Normal Range | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Key ON, Engine OFF or Engine running, normal operating temperature | |||
OSS Signal | OK | OK | OK |
OSS Supply Voltage | OK | Out of Range | Out of Range |
8.3-9.3 Volts = OK, Any other voltage = Out of range | |||
The A/Trans Output Speed Sensor Assembly has 2 internal hall-effect type sensors, and is capable of sensing both speed and direction. The output speed sensor is internal to the transmission and mounts to the A/Trans case assembly and is connected to the transmission control module (TCM) through the control solenoid valve assembly and transmission internal harness. The A/Trans Output Speed Sensor Assembly faces the park gear machined teeth surface. The sensor receives 8.3-9.3 volts on the OSS supply voltage circuit from the TCM. As the output shaft rotates, the sensor produces a signal frequency based on the machined surface of the output shaft.
The two sensor elements in the output speed sensor assembly are spaced approximately 1/2 a tooth apart.
| • | When the vehicle is moving in a forward direction, sensor A detects a particular tooth before sensor B. |
| • | When the vehicle is moving in a reverse direction, sensor B detects a particular tooth before sensor A. |
The electronics in the sensor combine the two signals and send a signal with a different pulse width. This signal is interpreted by the transmission control module for speed and direction and is transmitted through the serial data circuits to the engine control module (ECM) and the hybrid powertrain control module. The ECM, hybrid powertrain control module, and transmission control module compare the output speed sensor signal with the anti lock brake system (ABS) wheel speed sensor signal. The TCM is part of the control solenoid valve assembly and is not serviced separately. The hybrid powertrain control module is part of the drive motor generator power inverter module and is not serviced separately.
| • | The vehicle is moving. |
| • | The transmission control module correlates the transmission output speed with the ABS wheel speed and motor speed to detect any failures in the transmission output speed sensor. |
The difference between transmission output speed and the calculated average of output speed from the drive motors and ABS wheel speed sensors is greater than 150 RPM. The difference between the average of wheel speed sensors and drive motors and the output speed sensor is greater than 175 RPM.
| • | P215C is a Type B DTC. |
| • | The transmission control module calculates output speed based on the ABS wheel speed. |
| • | The HCP calculates vehicle direction based on drive motor direction. |
P215C is a Type B DTC.
Automatic Transmission Controls Schematics
Electronic Component Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information.
EL 38522 Variable Signal Generator
Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS and ABS wheel parameters on the scan tool.
| ⇒ | The Transmission OSS and ABS wheel speed signal parameters should not vary by greater than 10 km/h (6 mph). |
| ⇒ | If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Perform the Automatic Transmission Wiring Harness and Output Speed Sensor Removal and Automatic Transmission Wiring Harness and Output Speed Sensor Installation for OSS replacement. |
| • | Control Module References for Control Solenoid Valve Assembly and Transmission Control Module Assembly replacement, programming, and setup. |
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