C0870 SATURN - Device Voltage Reference Output Circuit
- Faulty Electro-Hydraulic Power Steering (EHPS) Powerpack
- Electro-Hydraulic Power Steering (EHPS) Powerpack harness is open or shorted
- Electro-Hydraulic Power Steering (EHPS) Powerpack circuit poor electrical connection
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C0870 Saturn DescriptionThe Brake Pedal Position (BPP) sensor provides an analog pedal position signal. Its output is hardwired to the Electro-Hydraulic Power Steering (EHPS) connector. The signal must be digitized and differentiated within the powerpack controller to provide the necessary pedal rate signal.
The BPP sensor is a resistive sensor with a total resistance between 3,000-5,000 ohms with a maximum current draw of less than 16 ma. The BPP sensor will output an analog signal that is referenced to 5 volts which may increase or decrease monotonically with brake pedal depression. The sensor analog output shall have a specified electrical output over a mechanical range of 32 degrees rotation of the brake pedal pivot. Out-of-range values will be provided outside of the 32 degree range.
The EHPS provides the BPP sensor with 5 volts, actual 4.3 volts, on the 5-volt reference circuit and a ground on the low reference circuit. Rotation of the BPP sensor during brake pedal movement provides the EHPS with a signal voltage from 1-4 volts through the BPP sensor signal circuit. When the control module detects that the BPP sensor signal or 5-volt reference voltage is outside the predetermined range, DTC C0870 is set.
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