Circuit 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0136 Base Brake System Pressure Circuit
DTC Symptom | DTC Symptom Descriptor |
|---|---|
08 | Signal Invalid |
00 | No Additional Information |
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. |
| • | A DIC message and/or a warning message may be displayed. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
If equipped, 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.
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.
- Ignition ON, test for 4.8-5.2 volts between the 5 volt reference circuit terminal 3 and ground.
- Verify the scan tool Brake Pressure Sensor Input, in VSES Data, is between 4.8 - 5.2 volts.
- Install a 3A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Brake Pressure Sensor Input is less than 0.5 volts.
- If all circuits test normal, test or replace the brake fluid pressure sensor. If DTC resets, replace the EBCM.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
| ⇒ | If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. |
| ⇒ | If greater than the specified range, test the 5 volt reference circuit for a short to voltage. |
| ⇒ | If less than the specified range, test the signal circuit terminal 2 for a short to ground. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. |
