SFI SYSTEM, Diagnostic DTC:C1263, C1264

DTC Code DTC Name
C1263 Ejector VSV Malfunction (High)
C1264 Ejector VSV Malfunction (Low)

DESCRIPTION

The ejector VSV is installed on the throttle by-pass and controlled by the ECM to optimally apply vacuum to the brake booster assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
C1263 Ejector VSV Malfunction (High)

Both of the following conditions are met for 3 seconds or more (1 trip detection logic):

(a) Ignition switch is ON.

(b) Terminal voltage is LO (short to +B) when VSV operation command is on.

  • Open or short in NO. 1 vacuum switching valve assembly (ejector VSV) circuit

  • (NO. 1 vacuum switching valve assembly) ejector VSV

  • ECM

 Does not come on DTC stored
C1264 Ejector VSV Malfunction (Low)

Both of the following conditions are met for 3 seconds or more (1 trip detection logic):

(a) Ignition switch is ON.

(b) Terminal voltage is HI (open or short to ground) when VSV operation command is off.

  • Open or short in (NO. 1 vacuum switching valve assembly) ejector VSV circuit

  • NO. 1 vacuum switching valve assembly (ejector VSV)

  • ECM

 Does not come on DTC stored

MONITOR DESCRIPTION

The ECM monitors the terminal voltage input from the NO. 1 vacuum switching valve assembly (ejector VSV). If the voltage and NO. 1 vacuum switching valve assembly (ejector VSV) operation command signals do not match, the ECM judges that there is a malfunction in the NO. 1 vacuum switching valve assembly (ejector VSV) circuit and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components NO. 1 vacuum switching valve assembly (ejector VSV)
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

B0026X8E38

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

    Tech Tips

    The A/C switch and all accessory switches should be off.

  7. Idle the engine for 15 minutes or more [B].

  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

  9. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  11. Input the DTC: C1263 or C1264.

  12. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E].

  13. Drive the vehicle at a constant speed between 40 and 60 km/h (25 and 37 mph) for 10 minutes or more [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  14. Check the DTC judgment result again [E].

WIRING DIAGRAM

A01SB7NE03

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (BRAKE EJECTOR VSV) INSPECTION)


    1. A01SAVH

      Disconnect the hose (connected to the air cleaner hose) of the ejector VSV.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Brake Ejector VSV Inspection.


      Powertrain > Engine and ECT > Active Test
      Tester Display
      Brake Ejector VSV Inspection

    6. When the ejector VSV is operated using the GTS, check whether the port of the NO. 1 vacuum switching valve assembly (ejector VSV) applies suction to your finger.

      OK
      GTS Operation Specified Condition
      ON NO. 1 vacuum switching valve assembly (ejector VSV) port applies suction to finger
      OFF NO. 1 vacuum switching valve assembly (ejector VSV) port applies no suction to finger
      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (EJECTOR VSV)


    1. Inspect the NO. 1 vacuum switching valve assembly (ejector VSV).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (EJECTOR VSV) Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (EJECTOR VSV))

    A01SCEJC02
    *a

    Front view of wire harness connector

    (to NO. 1 vacuum switching valve assembly (Ejector VSV))

    1. Disconnect the NO. 1 vacuum switching valve assembly (ejector VSV) connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A44-2 - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN RELAY - NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (EJECTOR VSV))

    OK

  4. CHECK HARNESS AND CONNECTOR (EJECTOR VSV - ECM)


    1. Disconnect the NO. 1 vacuum switching valve assembly (ejector VSV) connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A44-1 - C53-14 (PBV) Always Below 1 Ω
      A44-1 or C53-14 (PBV) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR