DTC

C101C:73

Electric vacuum pump: short circuit in drive circuit

DETECTION CONDITION

• Resistance of the electric vacuum pump drive circuit is less than 10 m ohm.

FAIL-SAFE FUNCTION

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

POSSIBLE CAUSE

• Electric vacuum pump circuits are shorted to each other

• Electric vacuum pump terminal B and terminal A are shorted to each other

• Electric vacuum pump connector or terminals malfunction

• EVP control unit connector or terminals malfunction

• Electric vacuum pump 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

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).

• 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.

3

• Switch the ignition ON (engine off).

• Access the following EVP control unit PIDs using the M-MDS:

• VP_MV

• VP_PV

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

• Verify PID VP_MV and VP_PV when the electric vacuum pump is operated by simulation item VPS_FBK.

• Are VP_MV and VP_PV PIDs within specification?

Specification:

• VP_MV: Below 0.8 V (VPS_FBK On), 4.1—8.7 V (VPS_FBK Off)

• VP_PV: 8.0—17.4 V (VPS_FBK On), 4.1—8.7 V (VPS_FBK Off)

Yes

Go to the next step.

No

Go to Step 7.

4

• Switch the ignition ON (engine off).

• Access the following EVP control unit PIDs using the M-MDS:

• VP_MV

• VP_PV

• VPS_FBK

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

• Are VP_MV and VP_PV PIDs within specification, while the vehicle is driven?

Specification:

• VP_MV: Below 0.8 V (VPS_FBK On), 4.1—8.7 V (VPS_FBK Off)

• VP_PV: 8.0—17.4 V (VPS_FBK On), 4.1—8.7 V (VPS_FBK Off)

Yes

Go to the next step.

No

Go to Step 7.

5

• Switch the ignition OFF.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the electric vacuum pump and EVP control unit connectors.

• Inspect for continuity between electric vacuum pump terminals A and B (wiring harness-side).

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector in the followings:

• Electric vacuum pump terminal B—EVP control unit terminal C

• Electric vacuum pump terminal A—EVP control unit terminal E

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 the next step.

No

Go to the next step.

6

• Connect the electric vacuum vacuum pump and EVP control unit connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

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

  (See CLEARING DTC [EVP CONTROL UNIT].)

• Switch the ignition ON (engine off).

• 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 11.

(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.

7

• Switch the ignition OFF.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the electric vacuum pump connector.

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

• Is the connector normal?

Yes

Go to the next step.

No

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

8

• Disconnect the EVP control unit connector.

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

• Is the connector normal?

Yes

Go to the next step.

No

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

9

• Verify that the electric vacuum pump and EVP control unit connectors are disconnected.

• Inspect for continuity between electric vacuum pump terminals A and B (wiring harness-side)

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector in the followings:

• Electric vacuum pump terminal B—EVP control unit terminal C

• Electric vacuum pump terminal A—EVP control unit terminal E

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 the next step.

No

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

(See ELECTRIC VACUUM PUMP REMOVAL/INSTALLATION.)

10

• 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.

11

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

DTC troubleshooting completed.