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 .
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 | Values | 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 | |
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 | 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 . 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 . 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 . 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 . 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 . Replace the BPP sensor. Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
