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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0282 Brake Pedal Position Sensor Circuit Range/Performance
Conditions for Running the DTC
| • | The EBCM control module must be powered. |
| • | This test is run continuously. |
Conditions for Setting the DTC
If the BPP sensor position changes more than 25 percent between consecutive 10 millisecond samples, caused by an intermittent resistive short to battery, ground or a BPP sensor malfunction.
Action Taken When the DTC Sets
When DTC C0282 is set the following will occur:
| • | The vehicle will not start |
| • | 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 and the ignition is cycled off and on. |
| • | A history DTC clears after 100 consecutive ignition cycles in which no faults have occurred. |
| • | Clear the DTC with a scan tool. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the 5-volt reference circuit of the BPP sensor for a intermittent short.
-
This step tests the signal circuit of the BPP sensor for a intermittent short.
-
This step tests the low reference circuit of the BPP sensor for a intermittent short.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics and Antilock Brake System Schematics in Antilock Brake System Connector End View Reference: Master Electrical Component List in Wiring Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Test the 5-volt reference circuit of the brake pedal position (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 7 | Go to Step 3 | |
Test the signal circuit of the BPP sensor for an intermittent short to ground or 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 7 | Go to Step 4 | |
Test the 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 7 | Go to Step 5 | |
5 | 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 7 | Go to Step 6 |
6 |
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 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
