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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 | P0722, P0723 | P0722, P0723 | P0722, P0723 | P0721, P215B |
OSS Signal | P0722, P0723 | P0722, P0723 | P0722, P0723 | P0721, P215B |
Circuit | Normal Range | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature | |||
Signal | 0-7,000 RPM | 0 RPM | 0 RPM |
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 | |||
Signal | OK | OK | OK |
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 speed is greater than 10 km/h (6 mph). |
| • | The vehicle is not in Park or neutral. |
The ECM OSS signal and the ABS wheel speed sensor signals differ by greater than 10 km/h (6 mph) for more than 10 seconds.
The ECM OSS signal and the ABS wheel speed sensor signals differ by greater than 10 km/h (6 mph) for more than 10 seconds.
| • | The ECM commands reduced vehicle power. |
| • | PROPULSION POWER REDUCED message is displayed on the driver information centre. |
The hybrid powertrain control module calculates the transmission output speed.
P215B is a Type A DTC.
P215B is a Type B DTC.
The hybrid system is very sensitive to the OSS signal for overall operation.
Automatic Transmission Controls Schematics
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information.
| ⇒ | The OSS and ABS wheel speed signal displays should not vary by greater than 10 km/h (6 mph). |
| ⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . |
| ⇒ | If the DTC resets, replace the control module which set the DTC. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM or Drive Motor Generator Power Inverter Module, also called the Power Inverter Module, replacement, programming, and setup.
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