1

Electric vacuum pump warning light remains illuminated

POSSIBLE CAUSE

• Electric vacuum pump warning light illuminates for emission-related concern (DTC is stored in EVP control unit)

• Instrument cluster malfunction (malfunction in Electric vacuum pump warning light illumination circuit)

• EVP control unit malfunction

• Electric vacuum pump warning light illumination request signal false transmission

• EVP control unit does not operate.

• Short to ground or open circuit in wiring harness between battery and EVP control unit terminal A

• Open circuit in wiring harness between EVP control unit terminal G and body ground

• Electric vacuum pump control unit related HS-CAN communication error

STEP

INSPECTION

ACTION

1

• Implement the network test using the M-MDS.

  (See NETWORK TEST.)

• Is the EVP (electric vacuum pump control unit) test result displayed as pass?

Yes

Go to the next step.

No

Go to Step 4.

2

• Switch the ignition ON (engine off).

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

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

Go to the next step.

3

• Turn on and off all the indicator lights and warning lights in the instrument cluster using the simulation function WL+IL in the M-MDS instrument cluster.

  (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].)

• Does the electric vacuum pump warning light turn on/off according to the simulation operation?

Yes

Replace the EVP control unit, then go to the next step.

(See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

Go to Step 7.

No

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Go to Step 7.

4

• Inspect for EVP control unit power supply as followings:

• Battery voltage

• Fuse (EVPS 30A)

• Wiring harness and connectors between battery and EVP control unit terminal A

• EVP control unit connector for poor connection (such as damaged/pulled-out pins, corrosion).

• Are inspection results normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part.

Go to Step 7.

5

• Switch the ignition OFF.

• Disconnect the EVP control unit connector.

• Measure the resistance between EVP control unit terminal G (wiring harness-side) and body ground.

• Is the resistance 0—1 ohm?

Yes

Go to the next step.

No

• If the open circuit could be detected in the wiring harness:

• Refer to the wiring diagram and verify whether or not there is a common connector between EVP control unit terminal G and body ground.

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 the next step.

• If the resistance is out of specification:

• Refer to the wiring diagram and verify whether or not there is a common connector between EVP control unit terminal G and body ground.

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 poor ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

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

• Go to the next step.

6

• Perform the CAN malfunction diagnosis flow.

  (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

• Are inspection results normal?

Yes

Replace the EVP control unit, then go to the next step.

(See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Repair or replace the malfunctioning part.

Go to the next step.

7

• Has the symptom troubleshooting been completed?

Yes

Troubleshooting completed. (explain the contents of the servicing to the customer)

No

Find the malfunctioning location referring to Action for Non-Repeatable Malfunction.

(See FOREWORD [EVP CONTROL UNIT].)