DTC P0557:00 [PCM (SKYACTIV-D 2.2)]

id0102j5218600

DTC P0557:00

Power brake unit vacuum sensor circuit low input

DETECTION CONDITION

•  With the following conditions met, the voltage of the power brake unit vacuum sensor is less than 0.21 V for a continuous 5 s.

―  Battery positive voltage: 8—16 V

―  The following DTCs are not detected

•  Constant voltage power supply control system: P0642:00, P0643:00

Diagnostic support note

•  This is a continuous monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Inhibits engine-stop by i-stop control.

POSSIBLE CAUSE

•  Power brake unit vacuum sensor connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  Power brake unit vacuum sensor terminal A and PCM terminal 2BB

―  Power brake unit vacuum sensor terminal B and PCM terminal 2BC

•  PCM connector or terminal malfunction

•  Short circuit in each wiring harness of power brake unit vacuum sensor

•  Open circuit in wiring harness between the following terminals:

―  Power brake unit vacuum sensor terminal A and PCM terminal 2BB

•  Power brake unit vacuum sensor malfunction

•  PCM malfunction

DTC P0557:00	Power brake unit vacuum sensor circuit low input
DETECTION CONDITION	• With the following conditions met, the voltage of the power brake unit vacuum sensor is less than 0.21 V for a continuous 5 s. ― Battery positive voltage: 8—16 V ― The following DTCs are not detected • Constant voltage power supply control system: P0642:00, P0643:00 Diagnostic support note • This is a continuous monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Inhibits engine-stop by i-stop control.
POSSIBLE CAUSE	• Power brake unit vacuum sensor connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Power brake unit vacuum sensor terminal A and PCM terminal 2BB ― Power brake unit vacuum sensor terminal B and PCM terminal 2BC • PCM connector or terminal malfunction • Short circuit in each wiring harness of power brake unit vacuum sensor • Open circuit in wiring harness between the following terminals: ― Power brake unit vacuum sensor terminal A and PCM terminal 2BB • Power brake unit vacuum sensor malfunction • PCM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

Note

•  Recording can be facilitated using the screen capture function of the PC.

•  Record the freeze frame data/snap shot data.

—

Go to the next step.

2

INSPECT POWER BRAKE UNIT VACUUM SENSOR CONNECTOR

•  Switch the ignition OFF.

•  Disconnect the power brake unit vacuum sensor connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 8.

3

INSPECT POWER BRAKE UNIT VACUUM SENSOR CIRCUIT FOR SHORT TO GROUND

•  Verify that the power brake unit vacuum sensor connector is disconnected.

•  Inspect for continuity between the following terminals (vehicle wiring harness side) and ground.

―  Power brake unit vacuum sensor terminal A

―  Power brake unit vacuum sensor terminal B

•  Is there continuity?

Yes

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

•  Power brake unit vacuum sensor terminal A and PCM terminal 2BB

•  Power brake unit vacuum sensor terminal B and PCM terminal 2BC

If there is a common connector:

―  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.

―  Repair or replace the malfunctioning location.

If there is no common connector:

―  Repair or replace the wiring harness which is shorted to ground.

Go to Step 8.

No

Go to the next step.

4

INSPECT PCM CONNECTOR CONDITION

•  Disconnect the PCM connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 8.

5

INSPECT EACH WIRING HARNESS OF POWER BRAKE UNIT VACUUM SENSOR CIRCUIT FOR SHORT CIRCUIT

•  Verify that the power brake unit vacuum sensor connector and the PCM connector are disconnected.

•  Switch the ignition OFF.

•  Inspect for continuity between power brake unit vacuum sensor terminals A, B, C (vehicle wiring harness side).

•  Is there continuity?

Yes

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

•  Power brake unit vacuum sensor terminal A and PCM terminal 2BB

•  Power brake unit vacuum sensor terminal B and PCM terminal 2BC

•  Power brake unit vacuum sensor terminal C and PCM terminal 2BD

If there is a common connector:

―  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short circuit to determine the malfunctioning location.

―  Repair or replace the malfunctioning location.

If there is no common connector:

―  Repair or replace the malfunctioning wiring harness.

Go to Step 8.

No

Go to the next step.

6

INSPECT POWER BRAKE UNIT VACUUM SENSOR CIRCUIT FOR OPEN CIRCUIT

•  Verify that the power brake unit vacuum sensor connector and the PCM connector are disconnected.

•  Inspect between the following terminals (vehicle wiring harness side) for continuity.

―  Power brake unit vacuum sensor terminal A and PCM terminal 2BB

•  Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify if there is a common connector between power brake unit vacuum sensor terminal A and PCM terminal 2BB.

If there is a common connector:

•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.

•  Repair or replace the malfunctioning location.

If there is no common connector:

•  Repair or replace the wiring harness which has an open circuit.

Go to Step 8.

7

INSPECT POWER BRAKE UNIT VACUUM SENSOR

•  Reconnect all the disconnected connectors.

•  Inspect the power brake unit vacuum sensor.
(See POWER BRAKE UNIT VACUUM SENSOR INSPECTION [SKYACTIV-D 2.2].)

•  Is the power brake unit vacuum sensor normal?

Yes

Go to the next step.

No

Replace the power brake unit vacuum sensor, then go to the next step.

(See POWER BRAKE UNIT VACUUM SENSOR REMOVAL/INSTALLATION [L.H.D.].)

(See POWER BRAKE UNIT VACUUM SENSOR REMOVAL/INSTALLATION [R.H.D.].)

8

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Reconnect all the disconnected connectors.

•  Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.
(See CLEARING DTC [PCM (SKYACTIV-D 2.2)].)

•  Perform the KOER self-test.
(See KOEO/KOER SELF TEST [PCM (SKYACTIV-D 2.2)].)

•  Has DTC P0557:00 been recorded?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

No

Go to the next step.

9

VERIFY OTHER DTCs

•  Has any other DTC or pending code been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the freeze frame data/snap shot data.	—	Go to the next step.
2	INSPECT POWER BRAKE UNIT VACUUM SENSOR CONNECTOR • Switch the ignition OFF. • Disconnect the power brake unit vacuum sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 8.
3	INSPECT POWER BRAKE UNIT VACUUM SENSOR CIRCUIT FOR SHORT TO GROUND • Verify that the power brake unit vacuum sensor connector is disconnected. • Inspect for continuity between the following terminals (vehicle wiring harness side) and ground. ― Power brake unit vacuum sensor terminal A ― Power brake unit vacuum sensor terminal B • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • Power brake unit vacuum sensor terminal A and PCM terminal 2BB • Power brake unit vacuum sensor terminal B and PCM terminal 2BC If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the wiring harness which is shorted to ground. Go to Step 8.
3		No	Go to the next step.
4	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
4		No	Repair or replace the connector, then go to Step 8.
5	INSPECT EACH WIRING HARNESS OF POWER BRAKE UNIT VACUUM SENSOR CIRCUIT FOR SHORT CIRCUIT • Verify that the power brake unit vacuum sensor connector and the PCM connector are disconnected. • Switch the ignition OFF. • Inspect for continuity between power brake unit vacuum sensor terminals A, B, C (vehicle wiring harness side). • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • Power brake unit vacuum sensor terminal A and PCM terminal 2BB • Power brake unit vacuum sensor terminal B and PCM terminal 2BC • Power brake unit vacuum sensor terminal C and PCM terminal 2BD If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short circuit to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the malfunctioning wiring harness. Go to Step 8.
5		No	Go to the next step.
6	INSPECT POWER BRAKE UNIT VACUUM SENSOR CIRCUIT FOR OPEN CIRCUIT • Verify that the power brake unit vacuum sensor connector and the PCM connector are disconnected. • Inspect between the following terminals (vehicle wiring harness side) for continuity. ― Power brake unit vacuum sensor terminal A and PCM terminal 2BB • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify if there is a common connector between power brake unit vacuum sensor terminal A and PCM terminal 2BB. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 8.
7	INSPECT POWER BRAKE UNIT VACUUM SENSOR • Reconnect all the disconnected connectors. • Inspect the power brake unit vacuum sensor. (See POWER BRAKE UNIT VACUUM SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is the power brake unit vacuum sensor normal?	Yes	Go to the next step.
7		No	Replace the power brake unit vacuum sensor, then go to the next step. (See POWER BRAKE UNIT VACUUM SENSOR REMOVAL/INSTALLATION [L.H.D.].) (See POWER BRAKE UNIT VACUUM SENSOR REMOVAL/INSTALLATION [R.H.D.].)
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)].) • Perform the KOER self-test. (See KOEO/KOER SELF TEST [PCM (SKYACTIV-D 2.2)].) • Has DTC P0557:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
8		No	Go to the next step.
9	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
9		No	DTC troubleshooting completed.