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Home >> Infiniti >> 2017 >> QX30 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (4 Of 5) >> DTC/Circuit Diagnosis >> DTC P1525: EVAP Control System Check Valve >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK COMPONENT FUNCTION

    G-20 With CONSULT

    1. Turn ignition switch ON. (Engine stopped.)
    2. On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK PURGING SWITCHOVER VALVE".
    3. Perform the Active Test.
    4. Check that the indicated value of "PWR CSMN (PURG SWOVR/V)" is between 390 - 495 mA.

    Is the inspection result normal?

    YES 

    GO TO STEP   7  .

    NO 

    GO TO STEP 2  .

  2. CHECK FUSE

    1. Turn ignition switch OFF.
    2. Check that No. 213 (15 A) fuse is not fusing.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Replace the fuse after repairing the applicable circuit.

  3. CHECK EVAP PURGE CONTROL VALVE POWER SUPPLY

    1. Insert the fuse which pulled out.
    2. Disconnect EVAP purge control valve harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between EVAP purge control valve harness connector and ground.
      + - Voltage
      EVAP purge control valve
      Connector Terminal
      E101 1 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 4  .

  4. CHECK EVAP PURGE CONTROL VALVE POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.
    2. Pull out No. 213 fuse.
    3. Check the continuity between EVAP purge control valve harness connector and fuse terminal.
      + - Continuity
      EVAP purge control valve
      Connector Terminal
      E101 1 No. 213 fuse terminal Existed
    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for power supply circuit.

    NO 

    Repair or replace error-detected parts.

  5. CHECK EVAP PURGE CONTROL VALVE

    Check EVAP purge control valve. Refer to COMPONENT INSPECTION (EVAP PURGE CONTROL VALVE) .

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Replace EVAP purge control valve. Refer to COMPONENT LOCATION .

  6. CHECK EVAP PURGE CONTROL VALVE CONTROL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECM harness connector and EVAP purge control valve harness connector.
      + - Continuity
      ECM EVAP purge control valve
      Connector Terminal Connector Terminal
      E48 153 E101 2 Existed
    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair or replace error-detected parts.

  7. CHECK EVAP PURGE CIRCUIT LEAKAGE

    Check leakage of the following components.

    • Hose and tube
    • EVAP canister
    • EVAP purge control valve (mechanical malfunction)

    INSPECTION END

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