DTC

C101B:16

Vacuum sensor 1 circuit low input

C101B:17

Vacuum sensor 1 circuit high input

DETECTION CONDITION

• C101B:16

• If the EVP control unit detects that the vacuum sensor 1 voltage at the EVP control unit terminal AC is below 0.16 V for 0.6 s, the EVP control unit determines that the vacuum sensor 1 circuit has a malfunction.

• C101B:17

• If the EVP control unit detects that the vacuum sensor 1 voltage at the EVP control unit terminal AC is above 4.9 V for 0.6 s, the EVP control unit determines that the vacuum sensor 1 circuit has a malfunction.

FAIL-SAFE FUNCTION

• Refer to “Fail-safe function table”. (See DTC TABLE [EVP CONTROL UNIT].)

POSSIBLE CAUSE

• Vacuum sensor 1 connector or terminals malfunction

• Short to ground circuit in wiring harness between vacuum sensor 1 terminal C and EVP control unit terminal AC

• EVP control unit connector or terminals malfunction

• Open circuit in wiring harness between vacuum sensor 1 terminal A and EVP control unit terminal AA

• Open circuit in wiring harness between vacuum sensor 1 terminal B and EVP control unit terminal Y

• Short to power supply in wiring harness between vacuum sensor 1 terminal C and EVP control unit terminal AC

• Open circuit in wiring harness between vacuum sensor 1 terminal C and EVP control unit terminal AC

• Vacuum sensor 1 malfunction

• EVP control unit malfunction

Step

Inspection

Action

1

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

• Using the M-MDS, perform the EVP control unit DTC inspection.

  (See DTC INSPECTION [EVP CONTROL UNIT].)

• Is the DTC C101B:1C detected?

Yes

Go to the applicable DTC inspection.

(See DTC C101B:1C [EVP CONTROL UNIT].)

No

Go to the next step.

3

• Verify the following items with regard to the recorded snap shot data from Step 1.

• VS1_V

• VPWR

• Are snapshot data VS1_V and VPWR within specification?

Specification:

• VS1_V: Approx. 5 V

• VPWR: 8.3—17.4 V

Yes

Go to the next step.

No

If DTC C101B:16 is stored:

• Go to Step 8.

If DTC C101B:17 is stored:

• Go to Step 12.

4

• Switch the ignition ON (engine off).

• Access the VS1 and VS2 PIDs using the M-MDS.

• 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

If DTC C101B:16 is stored:

• Go to Step 8.

If DTC C101B:17 is stored:

• Go to Step 12.

No

Go to the next step.

5

• Switch the ignition ON (engine off).

• Access the VS1 PID using the M-MDS.

• Does the value in PID VS1 change when the wiring harnesses for vacuum sensor 1 is shaken?

Yes

If DTC C101B:16 is stored:

• Go to Step 8.

If DTC C101B:17 is stored:

• Go to Step 12.

No

Go to the next step.

6

• Switch the ignition ON (engine off).

• Access the VS1 PID using the M-MDS.

• Drive the vehicle based on the service questions content and snap shot data driving conditions.

• Is the VS1 PID value below 40 kPa {300 mmHg, 11 inHg}, while the vehicle is driven?

Yes

Go to the next step.

No

If DTC C101B:16 is stored:

• Go to Step 8.

If DTC C101B:17 is stored:

• Go to Step 12.

7

• 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 17.

(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.

8

• Switch the ignition OFF.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the vacuum sensor 1 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 16.

9

• Verify that the vacuum sensor 1 connector is disconnected.

• Inspect for continuity between vacuum sensor 1 terminal C (wiring harness-side) and body ground.

• Is there continuity?

Yes

Disconnect the EVP control unit connector and inspect the wiring harness for short to ground.

• If the short to ground circuit could be detected in the wiring harness:

• Refer to the wiring diagram and verify whether or not there is a common connector between vacuum sensor 1 terminal C and EVP control unit terminal AC.

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 a short to ground circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground circuit.

• If the short to ground circuit could not be detected in the wiring harness:

• Replace the EVP control unit. (short to ground in the EVP control unit internal circuit)

  (See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

Go to Step 16.

No

Go to the next step.

10

• 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 16.

11

• Verify that the vacuum sensor 1 and EVP control unit connectors are disconnected.

• Inspect for continuity as followings (wiring harness-side):

• Vacuum sensor 1 terminal A—EVP control unit terminal AA

• Vacuum sensor 1 terminal B—EVP control unit terminal Y

• Is there continuity?

Yes

Replace the power brake unit, then go to Step 16. (Vacuum sensor 1 malfunction)

(See POWER BRAKE UNIT REMOVAL/INSTALLATION.)

No

Refer to the wiring diagram and verify whether or not there is a common connector in the followings:

• Vacuum sensor 1 terminal A—EVP control unit terminal AA

• Vacuum sensor 1 terminal B—EVP control unit terminal Y

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 Step 16.

12

• Switch the ignition OFF.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the vacuum sensor 1 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 16.

13

• Verify that the vacuum sensor 1 connector is disconnected.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Switch the ignition ON (engine off).

• Measure the voltage at the vacuum sensor 1 terminal C (wiring harness-side)—body ground.

• Is the voltage 5 V or more?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between vacuum sensor 1 terminal C and EVP control unit terminal AC.

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 a short to power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to power supply.

Go to Step 16.

No

Go to the next step.

14

• Switch the ignition OFF.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• 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 16.

15

• Verify that the vacuum sensor 1 and EVP control unit connectors are disconnected.

• Inspect for continuity between vacuum sensor 1 terminal C (wiring harness-side) and EVP control unit terminal AC (wiring harness-side).

• Is there continuity?

Yes

Replace the power brake unit, then go to the next step. (Vacuum sensor 1 malfunction)

(See POWER BRAKE UNIT REMOVAL/INSTALLATION.)

No

Refer to the wiring diagram and verify whether or not there is a common connector between vacuum sensor 1 terminal C and EVP control unit terminal AC.

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.

16

• 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 DTC present?

Yes

Repeat the inspection from Step1.

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.

17

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [EVP CONTROL UNIT].)

No

DTC troubleshooting completed.