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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 C1035-12: Electric Vacuum Pump Relay 1 - Short To Power Supply [EVP Control Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC C1035:12 (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.
  • 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 Pending DTC present?
 Yes Replace the EVP control unit, then go to Step 7. (See EVP CONTROL UNIT REMOVAL/INSTALLATION .)
No Go to the next Step.
3 DETERMINE WHETHER MALFUNCTION IS PAST OR PRESENT USING PID/DATA MONITOR FUNCTION 
  • Switch the ignition ON (engine off).
  • Access the following EVP control unit PIDs using the M-MDS:
    • VP PV
    • VPR1 V
    • VPWR
  • Compare the values of VP PV and VPWR with the PID VPR1 V verified when the VPR1 V PID is Off.
  • Is PID VP PV 90% or more of VPWR?
 Yes Replace the EVP control unit, then go to Step 7. (See EVP CONTROL UNIT REMOVAL/INSTALLATION .)
No Go to the next Step.
4 VERIFY DTC REPEATABILITY 
  • 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 simulation item VPS_FBK using the M-MDS.
  • Electric vacuum pump operation is stopped by simulation item VPS_FBK.
  • Using the M-MDS, perform the EVP control unit DTC inspection. (See DTC INSPECTION [EVP CONTROL UNIT] .)
  • Is the same Pending DTC present?
 Yes Replace the EVP control unit, then go to Step 7. (See EVP CONTROL UNIT REMOVAL/INSTALLATION .)
No Go to the next Step.
5 DRIVE VEHICLE THEN VERIFY DTC REPEATABILITY BASED ON SERVICE QUESTIONING RESULTS AND SNAPSHOT DATA 
  • Switch the ignition ON (engine off).
  • Access the following EVP control unit PIDs using the MMDS:
    • VP_PV
    • VPR1_V
    • VPWR
  • Drive the vehicle based on the service questions content and snapshot data driving conditions.
  • Compare the values of VP PV and VPWR with the PID VPR1 V verified when the VPR1 V PID is Off.
  • Is PID VP PV 90% or more of VPWR?
 Yes Replace the EVP control unit, then go to Step 7. (See EVP CONTROL UNIT REMOVAL/INSTALLATION .)
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 the next Step.
(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 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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