DTC

P050F:00

Low power brake unit vacuum

DETECTION CONDITION

• Power brake unit vacuum is 30 kPa {225 mmHg, 8.8 inHg} lower or more than the barometric pressure for a continuous 15 s when the electric vacuum pump is operating.

FAIL-SAFE FUNCTION

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

POSSIBLE CAUSE

• Electric vacuum pump power supply voltage decreases

• Vacuum line malfunction

• Electric vacuum pump malfunction

• Electric vacuum pump drive circuit malfunction

• EVP control unit malfunction

SYSTEM WIRING DIAGRAM

—

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 DTC inspection.

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Are following DTCs detected?

• C101C:00

• C101C:18

• C101C:71

• C101C:72

• C101C:73

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

Go to the next step.

3

• Verify the following items with regard to the recorded snap shot data from Step 1.

• VPS_FBK

• VPWR

• Is the snap shot data VPWR value is 8.3—17.4 V when the snap shot data VPS_FBK is On.

Yes

Go to the next step.

No

VPWR PID is below 8.3 V:

• Perform the DTC U3003:16 procedure.

  (See DTC U3003:16/U3003:17 [EVP CONTROL UNIT].)

VPWR PID is above 17.4 V:

• Go to the next step.

4

NOTE:

• When clearing the DTC, the snap shot data is also cleared at the same time. Snap shot data is recorded if it is not recorded in Step 1.

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

  (See CLEARING DTC [EVP CONTROL UNIT].)

• Switch the ignition ON (engine off).

• Disconnect the EVP control unit connector.

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

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

• Verify PIDs VS 1 and VS2 when the electric vacuum pump was operated for 10 s by simulation item VPS_FBK.

• Are VS1 and VS2 PIDs 31.5 kPa {236 mmHg, 9.30 inHg}or more?

Yes

Go to the next step.

No

Go to Step 7.

5

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

  (See CLEARING DTC [EVP CONTROL UNIT].)

• Start the engine and drive the vehicle.

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

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Is the same DTC present?

Yes

Go to Step 7.

No

Go to the next step.

6

• 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.

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

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Is the same DTC present?

Yes

Go to Step 8.

No

DTC troubleshooting completed.

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

7

• Inspect the vacuum line.

  (See VACUUM LINE INSPECTION.)

• Is the vacuum line normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part, then go to Step 9.

8

• Inspect the electric vacuum pump.

  (See ELECTRIC VACUUM PUMP INSPECTION.)

• Is the electric vacuum pump normal?

Yes

Go to the next step.

No

Replace the electric vacuum pump, then go to the next step.

(See ELECTRIC VACUUM PUMP REMOVAL/INSTALLATION.)

9

• 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.

10

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

DTC troubleshooting completed.