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Home >> Mazda >> 2022 >> MX-5 Miata RF Club >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> On-Board Diagnostics - Electric Vacuum Pump (EVP) >> DTC C101C-00: Electric Vacuum Pump - Open Circuit In Drive Circuit [EVP Control Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC C101C:00 (EVP CONTROL UNIT) DIAGNOSTIC PROCEDURE

Step INSPECTION Action
1 RECORD SNAPSHOT DATA TO UTILIZE WITH REPEATABILITY VERIFICATION 
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the snapshot data on the repair order.
 - Go to the next Step.
2 DETERMINE WHETHER MALFUNCTION IS PAST OR PRESENT 
NOTE:
  • When clearing the DTC, the snapshot data is also cleared at the same time. Snapshot 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 VP_MV, VP_PV and VPS_FBK PIDs using the M-MDS.
  • Access the simulation item VPS_FBK using the MMDS.
  • 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 SNAPSHOT DATA 
  • Switch the ignition ON (engine off).
  • Access the VP_MV, VP_PV and VPS_FBK PIDs using the M-MDS.
  • Drive the vehicle based on the service questions content and snapshot 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 
  • Switch the ignition OFF.
  • Inspect the wiring harness between the following terminals for an open circuit or connector connection malfunction.
  • Electric vacuum pump terminal B (wiring harness-side)-EVP control unit terminal C (wiring harness-side)
  • Electric vacuum pump terminal A (wiring harness-side)-EVP control unit terminal E (wiring harness-side)
  • Are inspection results normal?
 Yes Go to the next Step.
No Repair or replace the malfunctioning part, then go to Step 10.
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 terminal. (See NEGATIVE BATTERY TERMINAL 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 CIRCUIT FOR OPEN CIRCUIT 
  • Verify that the electric vacuum pump and EVP control unit connectors are disconnected.
  • Inspect for continuity as followings:
    • Electric vacuum pump terminal B (wiring harness-side)-EVP control unit terminal C (wiring harness-side)
    • Electric vacuum pump terminal A (wiring harness-side)-EVP control unit terminal E (wiring harness-side)
  • Is there continuity?
 Yes Replace the electric vacuum pump, then go to the next Step.
(See ELECTRIC VACUUM PUMP REMOVAL/INSTALLATION .)
No 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 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.
10 VERIFY DTC TROUBLESHOOTING COMPLETED 
 Yes Repeat the inspection from Step l.
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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