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

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DTC C1035:12 [EVP CONTROL UNIT]

DTC	C1035:12	Electric vacuum pump relay 1: short to power supply
DETECTION CONDITION		EVP control unit terminal C voltage is 90% or more of the battery voltage for a continuous 0.5 s when electric vacuum pump relay 1 is turned off.
FAIL-SAFE FUNCTION		Refer to “Fail-safe function table”. (See DTC TABLE [EVP CONTROL UNIT].)
POSSIBLE CAUSE		Electric vacuum pump relay 1 (built-into EVP control unit) stuck ON Short to power supply circuit in electric vacuum pump relay 1 (built-into EVP control unit) circuit Electric vacuum pump relay 1 (built-into EVP control unit) circuit malfunction EVP control unit malfunction
SYSTEM WIRING DIAGRAM		—

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. 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 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 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 SNAP SHOT DATA Switch the ignition ON (engine off). Access the following EVP control unit PIDs using the M-MDS: VP_PV VPR1_V VPWR Drive the vehicle based on the service questions content and snap shot 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 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 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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