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DTC C101C:73 [EVP CONTROL UNIT]

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

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

Diagnostic Procedure

Step

Inspection

Action

1

 RECORD SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION

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

 DETERMINE WHETHER MALFUNCTION IS PAST OR PRESENT

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.

Yes

Go to Step 7.

No

Go to the next step.

3

 VERIFY DTC REPEATABILITY

  • 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

 DRIVE VEHICLE THEN VERIFY DTC REPEATABILITY BASED ON SERVICE QUESTIONING RESULTS AND SNAP SHOT DATA

  • 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

 INSPECT ELECTRIC VACUUM PUMP CIRCUITS FOR SHORT TO EACH OTHER

  • 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

 VERIFY DTC REPEATABILITY AND DETERMINE IF MALFUNCTION CAUSE IS EVP CONTROL UNIT

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

 INSPECT ELECTRIC VACUUM PUMP CONNECTOR CONDITION

  • 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

 INSPECT EVP CONTROL UNIT CONNECTOR CONDITION

  • 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

 INSPECT ELECTRIC VACUUM PUMP CIRCUITS FOR SHORT TO EACH OTHER

  • 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

 VERIFY DTC TROUBLESHOOTING COMPLETED

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

 VERIFY NO DTC IS PRESENT

  • Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

DTC troubleshooting completed.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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