During calibration of the offset of the pressure sensor signal, the pressure sensor signal offset value must be in the range of 1-15 bar (1-434 psi).
The pressure sensor is also monitored for sensitivity via a correlation between estimated vehicle deceleration and the pressure sensor signal. This is monitored over the course of numerous straight line non-ABS braking stops.
This diagnostic procedure supports the following DTC:
DTC C0132 Antilock Brake System (ABS)/Traction Control System (TCS) Pressure Circuit Range/Performance
• | The ignition is ON. |
• | The vehicle speed is greater than 40 km/h (25 mph). |
• | The sensor signal offset value is out of range for more than 1 second. |
• | The brake pedal is not applied. |
• | The ABS pump is not ON. |
• | The brake pressure sensor sensitivity is outside a predetermined range. |
• | The brake pressure sensor indicates low brake fluid pressure, and the brake pedal position sensor indicates brakes applied. |
If equipped, the following actions occur:
• | The electronic brake control module (EBCM) disables the ABS/TCS/vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
• | A malfunction DTC will set. |
• | The ABS indicator turns ON. |
• | The Stability Off indicator turns ON. |
• | The red BRAKE warning indicator could turn ON. |
• | The condition for the DTC is no longer present. |
• | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
• | Using a scan tool |
• | A malfunctioning pressure sensor |
• | A malfunctioning EBCM |
• | Test the brake pedal position sensor (BPPS) for proper operation, and adjustment. A improperly adjusted BPPS will set the DTC. |
The numbers below refer to the step numbers on the diagnostic table.
This step tests for DTCs set in the body control module (BCM) lighting systems for a malfunctioning BPPS.
This step tests for specified voltage on the brake pressure signal circuit.
This step checks to see if voltage was below specified voltage.
This step checks to see if voltage was above specified voltage.
This step checks to see if voltage was above specified voltage of 5-volt reference.
This step checks to see if 5-volt reference from EBCM is 5 volts.
This step checks to see if resistance of ground circuit is less than 5 ohms.
This step tests for short to voltage in the 5-volt reference circuit.
This step tests for a short to ground, a high resistance, or an open in the 5-volt reference circuit.
This step tests for a short to voltage in the brake pressure sensor signal circuit.
This step tests for a high resistance or an open in the ground circuit.
This step checks to brake pressure sensor connector for poor connections.
This step checks to EBCM connector for poor connections.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
After performing the Diagnostic System Check, retrieve DTCs set for the brake pedal position sensor (BPPS) in Lighting Systems. Did the BPPS set DTCs? | -- | Go to Step 3 | ||
Is the voltage within the specified value? | 0.25-4.75 V | Go to Diagnostic Aids | Go to Step 4 | |
Is the voltage less than the specified value? | 4.75 V | Go to Step 5 | Go to Step 11 | |
Is the voltage greater than the specified value? | 0.25 V | Go to Step 6 | Go to Step 9 | |
Does the voltage measure less than the specified value? | 5 V | Go to Step 7 | Go to Step 8 | |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 13 | Go to Step 12 | |
Test the 5-volt reference circuit of the brake pressure sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 | |
Test the 5-volt reference circuit of the brake pressure sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 10 | |
Test the signal circuit of the brake pressure sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 | |
Test the signal circuit of the brake pressure sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 | |
Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 | |
Inspect for poor connections at the harness connector of the brake pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 15 | |
Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 16 | |
15 | Replace the brake pressure sensor. Refer to Brake Pressure Modulator Valve Pressure Sensor Replacement . Did you complete the replacement? | -- | Go to Step 17 | -- |
16 |
Important: Before replacing the EBCM, inspect the brake pedal position sensor for proper adjustment. Refer to Brake Pedal Position Sensor Calibration . Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 17 | -- |
17 |
Does the DTC reset? | -- | Go to Step 2 | System OK |