Diagnostic Procedure

DTC C101A:00 (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 IF SNAPSHOT DATA IS AFFECTED BY OTHER RELATED DTCs OCCURRING Using the M-MDS, perform the EVP control unit and PCM DTC inspection. (See DTC TABLE [PCM] .) (See DTC INSPECTION [EVP CONTROL UNIT] .) Are following DTCs detected? EVP control unit: C101B:16 C101B:17 PCM: P0555:00	Yes	Go to the applicable DTC inspection. (See DTC C101B:16/C101B:17 [EVP CONTROL UNIT] .) (See DTC P0555:00 [PCM] .)
2		No	Go to the next Step.
3	DETERMINE WHETHER MALFUNCTION IS PAST OR PRESENT Switch the ignition ON (engine off). Access the VS1 and VS2 PIDs using the M-MDS. Start the engine. Compare the values of PIDs VS1 and VS2. Is the difference between PIDs VS1 and VS2 5 kPa {38 mmHg, 2 inHg} or more?	Yes	Go to Step 8.
3		No	Go to the next Step.
4	VERIFY DTC REPEATABILITY Switch the ignition ON (engine off). Access the VS1 and VS2 PIDs using the M-MDS. Access the simulation item VPS_FBK using the M-MDS. Verify PID VS1 and VS2 when operating simulation item VPS_FBK. Do the values in PIDs VS1 and VS2 change when the wiring harnesses for vacuum sensor 1 and 2 are shaken?	Yes	If PID VS1 value changes: Go to Step 8. If PID VS2 value changes: Go to Step 10.
4		No	Go to the next Step.
5	INSPECT VACUUM SENSOR 1 AND VACUUM SENSOR 2 CIRCUITS Switch the ignition OFF. Inspect the wiring harness between the following terminals for an open circuit, short circuit or connector connection malfunction. Vacuum sensor 1 terminal A (wiring harness-side)-EVP control unit terminal AA (wiring harness-side) Vacuum sensor 1 terminal C (wiring harness-side)-EVP control unit terminal AC (wiring harness-side) Vacuum sensor 1 terminal B (wiring harness-side)-EVP control unit terminal Y (wiring harness-side) Vacuum sensor 2 terminal A (wiring harness-side)-PCM terminal 2AU (wiring harness-side) Vacuum sensor 2 terminal C (wiring harness-side)-PCM terminal 2X (wiring harness-side) Vacuum sensor 2 terminal B (wiring harness-side)-PCM terminal 2AI (wiring harness-side) Are connectors and harnesses normal?	Yes	Go to the next Step.
5		No	Repair or replace the malfunctioning part, then go to Step 12.
6	DRIVE VEHICLE THEN VERIFY DTC REPEATABILITY BASED ON SERVICE QUESTIONING RESULTS AND SNAPSHOT DATA Switch the ignition ON (engine off). Access the VS1 and VS2 PIDs using the M-MDS. Compare the service questions content and snapshot data driving conditions when the vehicle is driven with the values of PID VS1 and VS2. Is the difference between PIDs VS1 and VS2 5 kPa {38 mmHg, 2 inHg} or more?	Yes	Go to Step 8.
6		No	Go to the next Step.
7	DRIVE VEHICLE THEN VERIFY DTC REPEATABILITY BASED ON SERVICE QUESTIONING RESULTS AND SNAPSHOT DATA Using the M-MDS, clear the DTC from the EVP control unit. (See CLEARING DTC [EVP CONTROL UNIT] .) Drive the vehicle based on the service questions content and snapshot data driving conditions again. 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 13. (See EVP CONTROL UNIT REMOVAL/INSTALLATION .)
7		No	DTC troubleshooting completed. Explain to the customer that there are no malfunctions with the vehicle based on the contents of the servicing.
8	INSPECT VACUUM SENSOR 1 CIRCUIT Switch the ignition OFF. Inspect the wiring harness between the following terminals for an open circuit, short circuit or connector connection malfunction. Vacuum sensor 1 terminal A (wiring harness-side)-EVP control unit terminal AA (wiring harness-side) Vacuum sensor 1 terminal C (wiring harness-side)-EVP control unit terminal AC (wiring harness-side) Vacuum sensor 1 terminal B (wiring harness-side)-EVP control unit terminal Y (wiring harness-side) Are inspection results normal?	Yes	Go to the next Step.
8		No	Repair or replace the malfunctioning part, then go to Step 12.
9	INSPECT VACUUM SENSOR 1 Inspect the vacuum sensor 1. (See VACUUM SENSOR 1 INSPECTION .) Is the vacuum sensor 1 normal?	Yes	Go to the next Step.
9		No	Replace the power brake unit, then go to Step 12. (See POWER BRAKE UNIT REMOVAL/INSTALLATION .)
10	INSPECT VACUUM SENSOR 2 CIRCUIT Switch the ignition OFF. Inspect the wiring harness between the following terminals for an open circuit, short circuit or connector connection malfunction. Vacuum sensor 2 terminal A (wiring harness-side)-PCM terminal 2AU (wiring harness-side) Vacuum sensor 2 terminal C (wiring harness-side)-PCM terminal 2X (wiring harness-side) Vacuum sensor 2 terminal B (wiring harness-side)-PCM terminal 2AI (wiring harness-side) Are inspection results normal?	Yes	Go to the next Step.
10		No	Repair or replace the malfunctioning part, then go to Step 12.
11	INSPECT VACUUM SENSOR 2 Inspect the vacuum sensor 2. (See VACUUM SENSOR 2 INSPECTION .) Is the vacuum sensor 2 normal?	Yes	Go to the next Step.
11		No	Replace the power brake unit, then go to the next Step. (See POWER BRAKE UNIT REMOVAL/INSTALLATION .)
12	VERIFY DTC TROUBLESHOOTING COMPLETED Using the M-MDS, clear the DTC from the EVP control unit. (See CLEARING DTC [EVP CONTROL UNIT] .) Using the M-MDS, perform the EVP control unit DTC inspection. (See DTC INSPECTION [EVP CONTROL UNIT] .) Is the same Pending DTC present?	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 .)
12		No	Go to the next Step.
13	VERIFY NO DTC IS PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [EVP CONTROL UNIT] .)
13	VERIFY NO DTC IS PRESENT Are any DTCs present?	No	DTC troubleshooting completed.