Circuit Description
The 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 EHPS module 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 degrees range.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0282 Brake Pedal Position Sensor Circuit Range/Performance
Conditions for Running the DTC
| • | The EHPS module is in RUN mode. |
| • | The ignition switch is in the ACC or ON position. |
| • | Battery voltage is between 12-58 volts. |
Conditions for Setting the DTC
The BPP sensor rate information calculated from the sensor is greater than 100 percent/25 milliseconds.
Action Taken When the DTC Sets
| • | System operation is reduced. |
| • | The SERVICE BRAKE SYSTEM message will be displayed. |
| • | Ramp the motor speed input to the commanded flow resolved from a default brake pedal position. |
| • | Stores DTC C0282 in the powertrain control module (PCM). |
| • | History DTC C0282 will be set in the PCM. |
Conditions for Clearing the DTC
| • | The BPP sensor rate information calculated from the sensor is less than 100 percent/25 milliseconds. |
| • | Using the scan tool |
| • | A history DTC will clear after 255 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Diagnostic Aids
It may be necessary to check Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Test the 5-volt reference circuit of the brake pedal position sensor for an intermittent short.
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Test the signal circuit of the brake pedal position sensor for an intermittent short.
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This step tests the 5-volt reference circuit of the brake pedal position sensor for an intermittent short.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Power Steering Schematics Connector End Views Reference: Power Steering Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the rate of change a smooth transition within the specified values? | 0-10 percent/25 milliseconds | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Test the 5-volt reference circuit of the BPP sensor for an intermittent short to voltage or an intermittent short to ground. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 4 | |
Test the signal circuit of the BPP sensor for an intermittent short to ground or an intermittent short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 5 | |
Test the 5-volt low reference circuit of the BPP sensor for an intermittent short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 | |
6 | Inspect for poor connections at the harness connector of the BPP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
7 |
Important: Always perform the calibration procedure for the BPP sensor. Refer to Brake Pedal Position Sensor Calibration Description and Operation . Replace the BPP sensor. Refer to Brake Pedal Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
