Diagnostic Instructions
DTC Descriptor
DTC C0136 00: Base Brake System Pressure Circuit
DTC C0136 08: Base Brake System Pressure Circuit Signal Invalid
Circuit/System Description
The electronic brake control module (EBCM) uses the input from the brake fluid pressure sensor to enhance antilock brake system (ABS) braking and vehicle stability, if equipped.
Conditions for Running the DTC
The ignition is ON for 1 second.
Conditions for Setting the DTC
C0136 00
One of the following conditions exists for 0.1 second.
| • | The brake fluid pressure sensor signal is greater than 4.9 volts. |
| • | The brake fluid pressure sensor signal is less than 0.15 volt. |
C0136 08
The EBCM performs a diagnostic test on the base brake system pressure circuit and sensor when the ignition is turned ON. If the diagnostic determines a faulty sensor or wiring, the DTC will set.
Action Taken When the DTC Sets
| • | The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The traction control system (TCS) is degraded. |
| • | The traction control off indicator illuminates. |
| • | The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
The brake pressure sensor 5 volt reference circuit and low reference circuit is shared with other components in the vehicle stability system. DTCs can set for other components that share circuits with the brake pressure sensor.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the brake fluid pressure sensor.
- Test for less than 2.0 ohms of resistance between the low reference circuit terminal 1 and ground.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the brake fluid pressure sensor. |
- Ignition ON, test for 4.8-5.2 volts between the 5 volt reference circuit terminal 3 and ground.
| ⇒ | If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the brake fluid pressure sensor. |
| ⇒ | If greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the brake fluid pressure sensor. |
- Verify the scan tool Brake Pressure Sensor Input, in VSES Data, is less than 0.2 volts.
| ⇒ | If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the brake fluid pressure sensor. |
- Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 volt reference circuit terminal 3. Verify the scan tool Brake Pressure Sensor Input is greater than 4.7 volts.
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the brake fluid pressure sensor. |
- If all circuits test normal, test or replace the EBCM.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
