1000 - 1999: 1140

1140 - ESP BRAKE PRESSURE SENSOR 1 CIRCUIT





When Monitored and Set Condition

- When Monitored: Ignition on.
- Set Condition: The Controller Antilock Brake (CAB) detects an Electronic Stability Program (ESP) Brake Pressure Sensor 1 malfunction.





For a complete Antilock Brake System (ABS) Circuit Diagram Brakes - ABS Electrical Diagnostics.

Diagnostic Test

1. MEASURE THE VOLTAGE OF THE ESP BRAKE PRESSURE SENSOR 1 SIGNAL CIRCUIT




Turn the ignition off.
Disconnect the CAB harness connector.
Disconnect the ESP Brake Pressure Sensor 1 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the ESP Brake Pressure Sensor 1 Signal circuit at the ESP Brake Pressure Sensor 1 harness connector.
Is the voltage below 1.0 volt?

Yes

- Go to 2

No

- Repair the ESP Brake Pressure Sensor 1 Signal circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. ABS Verification Test

2. MEASURE THE RESISTANCE BETWEEN THE ESP BRAKE PRESSURE 1 SIGNAL CIRCUIT AND THE 5-VOLT SUPPLY CIRCUIT




Turn the ignition off.
Measure the resistance between the ESP Brake Pressure Sensor 1 Signal circuit and the 5-Volt Supply circuit in the ESP Brake Pressure Sensor 1 harness connector.
Is the resistance below 100k ohms?

Yes

- Repair the ESP Brake Pressure Sensor 1 Signal circuit for a short to the 5-Volt Supply circuit.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Go to 3

3. MEASURE THE RESISTANCE OF THE ESP BRAKE PRESSURE SENSOR 1 SIGNAL CIRCUIT




With the ignition off.
Measure the resistance of the ESP Brake Pressure Sensor 1 Signal circuit from the CAB harness connector to the ESP Brake Pressure Sensor 1 harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 4

No

- Repair the ESP Brake Pressure Sensor 1 Signal circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test

4. MEASURE THE RESISTANCE OF THE ESP BRAKE PRESSURE SENSOR 1 GROUND CIRCUIT




With the ignition off.
Measure the resistance of the Sensor Ground circuit from the CAB harness connector to the ESP Brake Pressure Sensor 1 harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 5

No

- Repair the Sensor Ground circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test

5. MEASURE THE VOLTAGE OF THE 5-VOLT SUPPLY CIRCUIT




With the ignition off.
Reconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of the 5-Volt Supply circuit at the ESP Brake Pressure Sensor 1 harness connector.
Is the voltage between 4.5 and 5.0 volts?

Yes

- Go to 6

No

- Go to 8

6. MEASURE THE RESISTANCE BETWEEN GROUND AND THE ESP BRAKE PRESSURE SENSOR 1 SIGNAL CIRCUIT




Turn the ignition off.
Disconnect the CAB harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the ESP Brake Pressure Sensor 1 Signal circuit.
Is the resistance below 100k ohms?

Yes

- Repair the ESP Brake Pressure Sensor 1 Signal circuit for a short to ground.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Go to 7

7. MEASURE THE RESISTANCE BETWEEN THE ESP BRAKE PRESSURE SENSOR 1 SIGNAL CIRCUIT AND THE SENSOR GROUND CIRCUIT




With the ignition off.
Measure the resistance between the ESP Brake Pressure Sensor 1 Signal circuit and the Sensor Ground circuit in the ESP Brake Pressure Sensor 1 harness connector.
Is the resistance below 100k ohms?

Yes

- Repair the ESP Brake Pressure Sensor 1 Signal circuit for a short to the Sensor Ground circuit.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Replace the ESP Brake Pressure Sensor 1. Removal.
- Perform ABS VERIFICATION TEST. ABS Verification Test

8. CHECK THE ESP BRAKE PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the CAB harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the 5-Volt Supply circuit at the ESP Brake Pressure Sensor 1 harness connector.
Is the voltage below 1.0 volt?

Yes

- Go to 9

No

- Repair the 5-Volt Supply circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. ABS Verification Test

9. MEASURE THE RESISTANCE BETWEEN THE ESP BRAKE PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT AND THE SENSOR GROUND CIRCUIT




Turn the ignition off.
Measure the resistance between the 5-Volt Supply circuit and the Sensor Ground circuit.
Is the resistance below 100k ohms?

Yes

- Repair the 5-Volt Supply circuit for a short to the Sensor Ground circuit.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Go to 10

10. MEASURE THE RESISTANCE BETWEEN GROUND AND THE ESP BRAKE PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT




With the ignition off.
Measure the resistance between ground and the 5-Volt Supply circuit.
Is the resistance below 100k ohms?

Yes

- Repair the 5-Volt Supply circuit for a short to ground.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Go to 11

11. MEASURE THE RESISTANCE OF THE ESP BRAKE PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT




With the ignition off.
Measure the resistance of the 5-Volt Supply circuit from the ESP Brake Pressure Sensor 1 harness connector to the CAB harness connector.
Is the resistance below 5.0 ohms?

Yes

- Replace the Controller Antilock Brake (CAB) Module. Removal.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Repair the ESP Brake Pressure Sensor 5-Volt Supply circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test