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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-71: Electric Vacuum Pump - Stuck [EVP Control Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC C101C:71 (EVP CONTROL UNIT) DIAGNOSTIC PROCEDURE

Step INSPECTION Action
1 RECORD SNAPSHOT DATA TO UTILIZE WITH REPEATABILITY VERIFICATION 
NOTE:
  • 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 VERIFY DTC REPEATABILITY 
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.
  • Using the M-MDS, clear the DTC from the EVP control unit. (See CLEARING DTC [EVP CONTROL UNIT] .)
  • Switch the ignition ON (engine off).
  • Access the VP C PID and simulation item VPS FBK using the M-MDS.
  • Verify PID VP_C when the electric vacuum pump is operated by simulation item VPS_FBK.
  • Is the VP C PID 60 A or more?
 Yes Replace the electric vacuum pump, then go to Step 5.
(See ELECTRIC VACUUM PUMP REMOVAL/INSTALLATION .)
No Go to the next Step.
3 DRIVE VEHICLE THEN VERIFY DTC REPEATABILITY BASED ON SERVICE QUESTIONING RESULTS AND SNAPSHOT DATA 
  • Switch the ignition ON (engine off).
  • Access the VP_C PID and simulation item VPS_FBK using the M-MDS.
  • Drive the vehicle based on the service questions content and snapshot data driving conditions.
  • Is the VP_C PID 60 A or more, while the vehicle is driven?
 Yes Replace the electric vacuum pump, then go to Step 5.
(See ELECTRIC VACUUM PUMP REMOVAL/INSTALLATION .)
NO  Go to the next Step.
4 VERIFY DTC REPEATABILITY AND DETERMINE IF MALFUNCTION CAUSE IS EVP CONTROL UNIT 
 Yes Replace the EVP control unit, then go to Step 6. (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.
5 VERIFY DTC TROUBLESHOOTING COMPLETED 
 Yes Repeat the inspection from Step 1. 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.
6 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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