Circuit Description
The brake pedal position (BPP) sensor is a potentiometer. The electronic brake control module (EBCM) supplies a 5-volt reference circuit and low reference circuit to the BPP sensor. The BPP sensor signal circuit is a direct input to the EBCM. The EBCM determines the BPP based on the voltage from the BPP sensor. The EBCM converts the BPP sensor feed back voltage to a digital signal and puts it on the class 2 communication bus. If the voltage is less than 0.25 volts, then DTC C0283 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0283 Brake Pedal Position Sensor Circuit Low
Conditions for Running the DTC
| • | The EBCM must be powered. |
| • | This test is run continuously. |
Conditions for Setting the DTC
The BPP sensor voltage is less than 0.25 volt for a consecutive period of 610 milliseconds.
Action Taken When the DTC Sets
When DTC C0283 is set the following will occur:
| • | The engine drive control is disabled. |
| • | The panic brake assist is disabled. |
| • | The traction control system is disabled. |
| • | The vehicle stability enhancement system is disabled. |
| • | The service vehicle soon lamp will illuminate. |
Conditions for Clearing the DTC
| • | The current DTC will clear when the fault is no longer present. |
| • | A history DTC clears after 100 consecutive ignition cycles in which no faults have occurred. |
| • | Clear the DTC with a scan tool. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Interior Lights Schematics and Antilock Brake System Schematics Connector End View Reference: Master Electrical Component List | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Is the BPP Sensor A/D Conversi parameter within the specified range? | 0.25-4.90 V | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 |
Is the BPP Sensor A/D Conversi parameter less than the specified value? | 0.25 V | Go to Step 4 | Go to Step 6 |
4 | Test the 5-volt reference circuit of the BPP sensor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 5 |
5 | Test the signal circuit of the BPP sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 |
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 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
8 |
Important: Always perform the calibration procedure for the BPP sensor. Refer to Brake Pedal Position Sensor Calibration . Replace the BPP sensor. Refer to Brake Pedal Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
