DTC P0555:00

Vacuum sensor 2 circuit problem

DETECTION CONDITION

• The PCM monitors the vacuum sensor 2 signal voltage while the ignition is switched ON. If the PCM detects the vacuum sensor 2 voltage is below 0.15 V or above 4.8 V for 5 s, the PCM determines that the vacuum sensor 2 circuit has problem.

Diagnostic support note

• This is a continuous monitor (other).

• The check engine light does not illuminate.

• FREEZE FRAME DATA is not available.

• Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

• Not applicable

POSSIBLE CAUSE

• Vacuum sensor 2 connector or terminals malfunction

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

• Vacuum sensor 2 terminal A—PCM terminal 2BG

• Vacuum sensor 2 terminal C—PCM terminal 2Q

• PCM connector or terminals malfunction

• Short to power supply in wiring harness between vacuum sensor 2 terminal C and PCM terminal 2Q

• Vacuum sensor 2 circuits are shorted to each other

• Open circuit in wiring harness between the following terminals:

• Vacuum sensor 2 terminal A—PCM terminal 2BG

• Vacuum sensor 2 terminal C—PCM terminal 2Q

• Vacuum sensor 2 terminal B—PCM terminal 2AH

• Vacuum sensor 2 malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

NOTE:

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

• Record the snapshot data on the repair order.

—

Go to the next step.

2

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

• Switch the ignition off.

• Disconnect the vacuum sensor 2 connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 10.

No

Go to the next step.

4

• Verify that the vacuum sensor 2 connector is disconnected.

• Inspect for continuity between the following terminals (wiring harness-side) and body ground:

• Vacuum sensor 2 terminal A

• Vacuum sensor 2 terminal C

• Is there continuity?

Yes

Disconnect the PCM connector and inspect the wiring harness for short to ground.

• If the short to ground circuit could be detected in the wiring harness:

• Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Vacuum sensor 2 terminal A—PCM terminal 2BG

• Vacuum sensor 2 terminal C—PCM terminal 2Q

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

• If the short to ground circuit could not be detected in the wiring harness:

• Replace the PCM (short to ground in the PCM internal circuit).

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to Step 10.

No

Go to the next step.

5

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 10.

No

Go to the next step.

6

• Verify that the vacuum sensor 2 and PCM connectors are disconnected.

• Switch the ignition ON (engine off).

  NOTE:

  • Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the vacuum sensor 2 terminal C (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between vacuum sensor 2 terminal C and PCM terminal 2Q.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to power supply.

Go to Step 10.

7

• Verify that the vacuum sensor 2 and PCM connectors are disconnected.

• Switch the ignition off.

• Inspect for continuity between vacuum sensor 2 terminals A, C and B (wiring harness-side).

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Vacuum sensor 2 terminal A—PCM terminal 2BG

• Vacuum sensor 2 terminal C—PCM terminal 2Q

• Vacuum sensor 2 terminal B—PCM terminal 2AH

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to each other.

Go to Step 10.

No

Go to the next step.

8

• Verify that the vacuum sensor 2 and PCM connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side):

• Vacuum sensor 2 terminal A—PCM terminal 2BG

• Vacuum sensor 2 terminal C—PCM terminal 2Q

• Vacuum sensor 2 terminal B—PCM terminal 2AH

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Vacuum sensor 2 terminal A—PCM terminal 2BG

• Vacuum sensor 2 terminal C—PCM terminal 2Q

• Vacuum sensor 2 terminal B—PCM terminal 2AH

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to Step 10.

9

• Inspect the vacuum sensor 2.

  (See VACUUM SENSOR 2 INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

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

(See POWER BRAKE UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

10

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Perform the KOEO or KOER self test.

  (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the next step.

No

Go to the next step.

11

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.