DTC

C101A:00

Vacuum sensor 1/ Vacuum sensor 2 correlation problem

DETECTION CONDITION

• Vacuum sensor 1 and 2 values are compared and the difference is 5 kPa {38 mmHg, 2 inHg} or more for a continuous 1 s.

FAIL-SAFE FUNCTION

• Refer to “Fail-safe function table”. (See DTC TABLE [EVP CONTROL UNIT].)

POSSIBLE CAUSE

• Malfunctions (open circuit, short circuit, connection malfunction) in the following wiring harnesses and connectors

• Vacuum sensor 1 terminal A—EVP control unit terminal AA

• Vacuum sensor 1 terminal C—EVP control unit terminal AC

• Vacuum sensor 1 terminal B—EVP control unit terminal Y

• 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 1 malfunction

• Vacuum sensor 2 malfunction

• EVP control unit malfunction

Step

Inspection

Action

1

NOTE:

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

• Record the snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (fuel system related) on the repair order.

—

Go to the next step.

2

• Using the M-MDS, perform the EVP control unit and PCM DTC inspection.I

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

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Are following DTCs detected?

EVP control unit:

• C101B:16

• C101B:17

PCM:

• P0555:00

Yes

Go to the applicable DTC inspection.

(See DTC C101B:16/C101B:17 [EVP CONTROL UNIT].)

(See DTC P0555:00 [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

3

• Switch the ignition ON (engine off).

• Access the VS1 and VS2 PIDs using the M-MDS.

• Start the engine.

• Compare the values of PIDs VS1 and VS2.

• Is the difference between PIDs VS1 and VS2 5 kPa {38 mmHg, 2 inHg} or more?

Yes

Go to Step 8.

No

Go to the next step.

4

• Switch the ignition ON (engine off).

• Access the VS1 and VS2 PIDs using the M-MDS.

• Access the simulation item VPS_FBK using the M-MDS.

• Verify PID VS1 and VS2 when operating simulation item VPS_FBK.

• Do the values in PIDs VS1 and VS2 change when the wiring harnesses for vacuum sensor 1 and 2 are shaken?

Yes

If PID VS1 value changes:

• Go to Step 8.

If PID VS2 value changes:

• Go to Step 10.

No

Go to the next step.

5

• Switch the ignition OFF.

• Inspect the wiring harness between the following terminals for an open circuit, short circuit or connector connection malfunction.

• Vacuum sensor 1 terminal A (wiring harness-side)—EVP control unit terminal AA (wiring harness-side)

• Vacuum sensor 1 terminal C (wiring harness-side)—EVP control unit terminal AC (wiring harness-side)

• Vacuum sensor 1 terminal B (wiring harness-side)—EVP control unit terminal Y (wiring harness-side)

• Vacuum sensor 2 terminal A (wiring harness-side)—PCM terminal 2BG (wiring harness-side)

• Vacuum sensor 2 terminal C (wiring harness-side)—PCM terminal 2Q (wiring harness-side)

• Vacuum sensor 2 terminal B (wiring harness-side)—PCM terminal 2AH (wiring harness-side)

• Are connectors and harnesses normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part, then go to Step12.

6

• Switch the ignition ON (engine off).

• Access the VS1 and VS2 PIDs using the M-MDS.

• Compare the service questions content and snap shot data driving conditions when the vehicle is driven with the values of PID VS1 and VS2.

• Is the difference between PIDs VS1 and VS2 5 kPa {38 mmHg, 2 inHg} or more?

Yes

Go to Step 8.

No

Go to the next step.

7

• Using the M-MDS, clear the DTC from the EVP control unit.

  (See CLEARING DTC [EVP CONTROL UNIT].)

• Drive the vehicle based on the service questions content and snap shot data driving conditions again.

• Using the M-MDS, perform the EVP control unit DTC inspection.

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Is the same DTC present?

Yes

Replace the EVP control unit, then go to Step 13.

(See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

Explain to the customer that there are no malfunctions with the vehicle based on the contents of the servicing.

8

• Switch the ignition OFF.

• Inspect the wiring harness between the following terminals for an open circuit, short circuit or connector connection malfunction.

• Vacuum sensor 1 terminal A (wiring harness-side)—EVP control unit terminal AA (wiring harness-side)

• Vacuum sensor 1 terminal C (wiring harness-side)—EVP control unit terminal AC (wiring harness-side)

• Vacuum sensor 1 terminal B (wiring harness-side)—EVP control unit terminal Y (wiring harness-side)

• Are inspection results normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part, then go to Step 12.

9

• Inspect the vacuum sensor 1.

  (See VACUUM SENSOR 1 INSPECTION.)

• Is the vacuum sensor 1 normal?

Yes

Go to the next step.

No

Replace the power brake unit, then go to Step 12.

(See POWER BRAKE UNIT REMOVAL/INSTALLATION.)

10

• Switch the ignition OFF.

• Inspect the wiring harness between the following terminals for an open circuit, short circuit or connector connection malfunction.

• Vacuum sensor 2 terminal A (wiring harness-side)—PCM terminal 2BG (wiring harness-side)

• Vacuum sensor 2 terminal C (wiring harness-side)—PCM terminal 2Q (wiring harness-side)

• Vacuum sensor 2 terminal B (wiring harness-side)—PCM terminal 2AH (wiring harness-side)

• Are inspection results normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part, then go to Step 12.

11

• Inspect the vacuum sensor 2.

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

• Is the vacuum sensor 2 normal?

Yes

Go to the next step.

No

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

(See POWER BRAKE UNIT REMOVAL/INSTALLATION.)

12

• Using the M-MDS, clear the DTC from the EVP control unit.

  (See CLEARING DTC [EVP CONTROL UNIT].)

• Using the M-MDS, perform the EVP control unit DTC inspection.

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Is the same DTC present?

Yes

Repeat the inspection from Step1.

If the malfunction recurs, replace the EVP control unit, then go to the next step.

(See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

13

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

DTC troubleshooting completed.