DTC P0557 or P0558
Diagnostic Instructions
DTC Descriptors
DTC P0557 00: Brake Servo Pressure Sensor
Circuit Low Voltage
DTC P0558 00: Brake Servo Pressure Sensor
Circuit High Voltage
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5V Reference
|
P0641
|
P0557
|
P0641
|
-
|
Signal
|
P0557
|
P0557
|
P0558
|
-
|
Low Reference
|
-
|
P0558
|
--
|
--
|
Circuit/System Description
The brake servo pressure sensor measures the pressure inside the
brake servo. The engine control module (ECM) supplies a regulated
5 V to the sensor on the 5 V reference circuit. The ECM
supplies an ground on the low reference circuit. The brake servo
pressure sensor provides a signal voltage to the ECM, relative to
the pressure changes, on signal circuit. The ECM converts the
signal voltage input to a pressure value.
Conditions for Running the DTC
Conditions for Setting the DTC
The ECM detects the brake servo pressure sensor signal circuit
is open, shorted to ground, or shorted to a voltage for greater
than 1 s.
Action Taken When the DTC Sets
DTCs P0557, and P0558 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0557, and P0558 are Type B DTCs.
Diagnostic Aids
If a shared 5 V reference circuit is shorted to ground or
shorted to a voltage, other 5 V reference circuits may be
affected.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition On, observe the DTC information with a scan
tool. Verify that DTCs P0641 is not set.
⇒ |
If any DTCs are set, refer to: |
- Engine running, observe the scan tool Brake Servo
Pressure Sensor parameter. The reading should be between
0.3-4.8 V.
⇒ |
If not the specified value, refer to
Circuit/System Testing. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the
B19B Brake Servo Vacuum Sensor.
- Test for less than 5 Ω between the low reference
circuit terminal 2 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 K20 Engine Control Module. |
- Ignition ON, test for 4.8-5.2 V between the
5 V reference circuit terminal 3 and ground.
⇒ |
If less than the specified range, test the
5 V reference circuit for a short to ground or an open/high
resistance. If the circuit tests normal, replace the
K20 Engine Control Module. |
⇒ |
If greater than the specified range, test the
5 V reference circuit for a short to voltage. If the circuit
tests normal, replace the K20 Engine Control Module. |
- Verify the scan tool Brake Servo Pressure Sensor
parameter is greater than 4.8 V.
⇒ |
If less than the specified range, test the signal
circuit for a short to ground. If the circuit tests normal, replace
the K20 Engine Control Module. |
- Install a 3 A fused jumper wire between the
signal circuit terminal 1 and the low reference circuit
terminal 2. Verify the Brake Servo Pressure Sensor parameter
is less than 0.3 V.
⇒ |
If greater than the specified range, test the
signal circuit for an open circuit or a short to voltage. If the
circuit tests normal, replace the K20 Engine Control
Module. |
- If all circuits test normal, replace the
B19B Brake Servo Vacuum Sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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