C0890

DTC C0890

DTC Descriptor
DTC C0890 03
- Voltage Below Threshold

DTC C0890 07
- Voltage Above Threshold

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview





Circuit/System Description

The body control module (BCM) applies a ground through the brake pedal position sensor low reference circuit to the brake pedal position sensor (BPPS). The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the BPPS. When the brake pedal is being applied, the BPPS then sends a variable voltage through the brake sensor signal circuit to the BCM.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

* The BCM detects a voltage that is lower then 5 volts on the brake pedal position sensor 5-volt reference circuit.
* The BCM detects a voltage that is greater then 5 volts on the brake pedal position sensor 5-volt reference circuit.

Action Taken When the DTC Sets

The stop lamps will not function correctly.

Conditions for Clearing the DTC

The BCM clears this code from current when the fault is removed from the system.

Circuit/System Verification

Ignition ON, press and release the brake pedal. The stop lamps should illuminate then go out.

Circuit/System Testing

1. Ignition OFF, disconnect the BPPS. With a DMM, measure the voltage at the BPPS Brake pedal position sensor 5-volt reference circuit.

• If less then 5 volts, test the brake pedal position sensor 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.
• If more then 5 volts, test the brake pedal position sensor 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the BCM.

2. If all circuits/connections test normal, replace the brake pedal position sensor.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Important: Always perform the brake pedal position sensor calibration Brake Pedal Position Sensor Calibration after replacement of the brake pedal position sensor.

Brake Pedal Position Sensor Replacement