Scan Tool Data Definitions

Scan Tool Data Definitions
The electro-hydraulic power steering (EHPS) scan tool data display values and definition information that can assist in diagnosing EHPS related problems, especially when no diagnostic trouble codes (DTC) are stored in memory. A vehicle's scan tool data can be compared with the data display values from a known good vehicle in the scan tool data display table. When data from the vehicle differs from the typical data display value, the data definition information will help in understanding the nature of the difference and the source of the problem. This list is in alphanumeric order.

Data Definitions
Brake Pedal Travel - -50 to 200 mm (-1.97 to 7.87 inch)
This data represents the chord length translation position of the brake pedal through its normal range of movement.
BPP Sensor Rate - 0 to +10%/25 ms
This data indicates the rate of change of the brake pedal.
BPP Sensor Input Voltage - 0 to 5 Volts
This data represents the voltage being supplied to the BPP Sensor as measured by the EHPS system.
BPP Sensor Output Voltage - 0 to 5 Volts
This data represents a raw brake pedal position indicated by the voltage being received by the EHPS module from the BPP Sensor as measured by the EHPS system.
EHPS 42 V Bus Voltage - 0 to 76 Volts
This data indicates the voltage of the 42 V bus at the EHPS module.
EHPS Ignition 0- OFF/ON
This data represents the voltage of the Accessory signal at the EHPS module as read by the EHPS system.
EHPS Ignition 1 - OFF/ON
This data represents the voltage of the Ignition 1 signal at the EHPS module as read by the EHPS system.
EHPS Demand - -100 to +100%
This data represents the percentage of the available EHPS pump output being delivered as determined by the EHPS system.
EHPS Demand Speed - 0 to +7500 RPM
This data represents the current pump speed being commanded as determined by the EHPS system.
EHPS ECU Temperature - -180 to +180°C (-238 to +302°F)
This data represents the temperature of the EHPS module in the EHPS system as determined by the EHPS system.
EHPS Manifold Temperature - -180 to +180°C (-238 to +302 °F)
This data represents the temperature of the manifold in the EHPS system as determined by the EHPS system.
EHPS Motor Current - 0 to +200 A
This data represents the current being used by the EHPS motor as measured by the EHPS system.
EHPS Motor RPM - 0 to +7500 RPM
This data represents the rotational speed of the EHPS motor as determined by the EHPS system.
Steering Wheel Rate - 0 to 2048°/s
This data represents the approximate degrees per second change of the steering wheel as determined by the EHPS system.
Steering Wheel Sensor Phase A Volts - Low/High
This data represents the state of the Phase A digital output of the steering wheel sensor at the EHPS unit as currently read by the EHPS system.
Steering Wheel Sensor Phase B Volts - Low/High
This data represents the state of the Phase B digital output of the steering wheel sensor at the EHPS unit as currently read by the EHPS system.
Vehicle Speed - km/h (mph)
This data represents the calculated speed of the vehicle as determined by the PCM.