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C1103



DTC C1101-C1103 or P0556-P0558

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0556
- Brake Booster Pressure Sensor Performance

DTC P0557
- Brake Booster Pressure Sensor Circuit Low Voltage

DTC P0558
- Brake Booster Pressure Sensor Circuit High Voltage

DTC C1101
- Base Brake System Pressure Sensor Circuit Performance

DTC C1102
- Base Brake System Pressure Sensor Circuit Low Voltage

DTC C1103
- Base Brake System Pressure Sensor Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data

Hybrid Data:





Circuit/System Description

The brake booster pressure sensor measures the pressure inside the power brake booster assembly. Pressure in the power brake booster is affected by engine speed, throttle opening, air temperature, and barometric pressure. A diaphragm within the brake pressure sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The brake booster pressure sensor wiring includes 3 circuits. The control module supplies a regulated 5 volts to the sensor on a 5-volt reference circuit. The engine control module (ECM) supplies a ground on a low reference circuit. The brake booster pressure sensor provides a signal voltage to the ECM, relative to the pressure changes, on the brake booster pressure sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

The base brake system pressure sensor measure the pressure inside the hydraulic brake lines from the master cylinder.

Conditions for Running the DTC

P0556
* DTCs P0106, P0107, P0108, P0220, P0222, or P0223 are not set.
* The throttle position is less than 1 percent when the engine speed is less than or equal to 1,000 RPM.
* The brake booster pressure is increasing more than 0.3 kPa during 0.2 seconds.

P0557 or P0558
* The engine is running.
* This diagnostic runs continuously.

C1101
* The ignition is on or engine is running.
* The base brake pressure circuit high or low DTCs have not set.
* The transmission is in the drive position.
* The vehicle speed DTCs not present.

C1102 or C1103
* The ignition is on or engine is running.
* This diagnostic runs continuously.

Conditions for Setting the DTC

P0556
* The throttle is closed and the pressure difference between the engine manifold vacuum, and brake booster vacuum is higher than threshold 6 kPa.
* The brake booster pressure sensor detects a leak in the brake booster system.

P0557 or P0558
* The DTC will set when a brake booster pressure sensor or signal circuit is out of range low.
* The DTC will set when a brake booster pressure sensor or signal circuit is out of range High.

C1101
* The engine is running.
* This diagnostic runs continuously.

C1102 or C1103
* The engine is running.
* This diagnostic runs continuously.

Action Taken When the DTC Sets

DTC P0107 and P0108 are Type B DTCs.

Conditions for Clearing the DTC

DTC P0556, P0557, P0558 and C1101, C1102, C1103 are Type B DTCs.

Reference Information

Schematic Reference

Hydraulic Brake Schematics

Connector End View Reference

* Engine Control Module Connector End Views
* Engine Controls Connector End Views

Electrical Information Reference

* Testing for Intermittent Conditions and Poor Connections
* Connector Repairs
* Circuit Testing
* Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

* Scan Tool Output Controls
* Scan Tool Data List

Special Tool Reference

J 23738-A

Circuit/System Verification

Important: Verify that the engine is in good mechanical condition before continuing with this diagnostic.

1. If P0641 or P0651 are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
2. Verify the integrity of the entire air induction system by inspecting for the following conditions:

* Any damaged components
* Loose or improper installation
* An air flow restriction
* Any vacuum leak
* Improperly routed vacuum hoses
* In cold climates, inspect for any snow or ice buildup.

3. Verify that restrictions do not exist in the brake booster sensor port or vacuum source.
4. Verify that restrictions do not exist in the exhaust system.
5. A skewed brake booster sensor will also cause the intake manifold models to disagree with the actual MAP sensor measurements. Use the scan tool and compare the MAP and brake booster Sensor parameter to a known good vehicle, under various operating conditions.

Circuit/System Testing

Important: All electrical components and accessories must be turned OFF, and allowed to power down.

1. Ignition OFF, disconnect the harness connector at the brake booster pressure sensor or the base brake fluid pressure sensor.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 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 ECM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 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 ECM.
* If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool brake booster or base brake fluid pressure sensor parameter is in the correct range.

* If greater than the specified range, test the signal circuit terminal for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal and the 5-volt reference circuit terminal. Verify the scan tool brake booster or base brake fluid pressure sensor parameter is greater than correct range.

* If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits test normal, test or replace the brake booster or base brake fluid sensor.

Component Testing

1. Turn ON the ignition, with the engine OFF, and remove the brake booster pressure sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal or the sensor and the corresponding circuit terminal in the harness connector of the brake booster pressure sensor.
3. Install a jumper wire between the low reference circuit terminal of the brake booster pressure sensor and ground.
4. Install a jumper wire at signal circuit terminal of the brake booster pressure sensor.
5. Connect a DMM between the jumper wire from signal terminal of the brake booster pressure sensor and ground.
6. Install the J 23738-A to the sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.

* If the voltage is not within the specified range or is erratic, replace the brake booster pressure sensor.

Repair Instructions

Perform the following procedures after completing the diagnostic procedure.

* Diagnostic Repair Verification Verification Tests
* Control Module References

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