Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data Definitions
- Actual Motor Current
-
The scan tool displays 0.0 amps to 58.0 amps. The actual amount of current the Power Steering Control Module (PSCM) is commanding to the Electric Power Steering (EPS) motor.
- Battery Voltage
-
The scan tool displays 8-17 volts. The level of battery voltage available at the PSCM.
- Desired Motor Current
-
The scan tool displays 0.0 amps to 58.0 amps. The amount of current the PSCM is attempting to command to the EPS motor.
- Engine Running
-
The scan tool displays Yes or No. Yes indicates the PSCM is receiving it's class 2 message that the engine is running. No indicates the class 2 message is ether missing, invalid, or the engine is not running.
- Ignition Voltage
-
The scan tool displays 0-17 volts. The level of ignition voltage available at the PSCM.
- Limiting Motor Current
-
The scan tool displays up to 65 amps. The amount of current last commanded to the EPS motor before the system went into overload protection mode. 65 amps indicates that an overload protection incident has not occurred.
- Motor Voltage +
-
The scan tool displays 7.0-14.0 volts. The amount of voltage being supplied to the EPS motor while turning right.
- Motor Voltage -
-
The scan tool displays 7.0-14.0 volts. The amount of voltage being supplied to the EPS motor while turning left.
- Torque Sensor Amplified
-
The PSCM takes the detection coil voltage and multiplies it. This amplified signal voltage is used by the PSCM to compensate for lag in mechanical steering components.
- Torque Sensor Main
-
The scan tool displays -17.2 N.m to 17.2 N.m (12.6 lb ft). The amount of torque being applied to the steering column shaft when turning the steering wheel. This signal voltage is from the detection coil of the torque sensor which is then converted to N.m by the PSCM. A - value indicates a left turn, a positive value indicates a right turn.
- Torque Sensor Sub
-
The scan tool displays -17.2 N.m to 17.2 N.m (12.6 lb ft). This signal voltage is from the compensation coil of the torque sensor which is then converted to N.m by the PSCM. The Torque Sensor Main and Torque Sensor Sub data parameters should behave the same as each other.
- Tuning Profile
-
The scan tool displays 1-8. The number of the steering calibration the PSCM has been programmed to. After replacement, the PSCM must be programmed with the proper calibration using the Saturn Service Stall.
- Vehicle Speed
-
The scan tool displays 0-255 km/h (0-156 mph). The actual speed of the vehicle.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.