ECD SYSTEM, Diagnostic DTC:P0100

DTC Code DTC Name
P0100 Mass or Volume Air Flow Sensor "A" Circuit

DESCRIPTION

When the engine is running and the supply voltage to the ECM is outside the threshold, the ECM determines that the supply voltage to the mass air flow meter sub-assembly has decreased.

When the supply voltage to the mass air flow meter sub-assembly has decreased, this DTC differentiates when there is a malfunction with the mass air flow meter sub-assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0100 Mass or Volume Air Flow Sensor "A" Circuit

Either condition is met (3 trip detection logic):


  • Supply voltage to ECM while engine is running is less than 7 V for 1 second.

  • Supply voltage to ECM while engine is running is more than 17 V for 1 second.

  • Open or short in power source circuit

  • Battery

  • EFI MAIN NO. 1 relay

  • ECM

 Does not come on DTC stored

WIRING DIAGRAM

A01QSWPE02

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs registration and initialization.

    Click here

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

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK BATTERY VOLTAGE


    1. Check battery voltage.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    RECHARGE OR REPLACE BATTERY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR


    1. Disconnect the negative (-) battery terminal.

    2. Disconnect the positive (+) battery terminal.

    3. Disconnect the ECM connector.

    4. Remove the EFI MAIN NO. 1 relay from the engine room and junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A62-4 (E1) - Body ground Always Below 1 Ω
      A62-5 (E2) - Body ground Always Below 1 Ω
      A62-17 (E3) - Body ground Always Below 1 Ω
      A62-18 (E4) - Body ground Always Below 1 Ω
      A62-15 (BATT) - positive (+) battery terminal Always Below 1 Ω
      A62-2 (+B) - 3 (EFI MAIN NO. 1 relay holder) Always Below 1 Ω
      A62-14 (+B2) - 3 (EFI MAIN NO. 1 relay holder) Always Below 1 Ω
      A62-1 (+B3) - 3 (EFI MAIN NO. 1 relay holder) Always Below 1 Ω
      A62-9 (MREL) - 1 (EFI MAIN NO. 1 relay holder) Always Below 1 Ω
      5 (EFI MAIN NO. 1 relay holder) - positive (+) battery terminal Always Below 1 Ω
      2 (EFI MAIN NO. 1 relay holder) - Body ground Always Below 1 Ω
      A62-15 (BATT) or positive (+) battery terminal - Body ground Always 10 kΩ or higher
      A62-2 (+B) or 3 (EFI MAIN NO. 1 relay holder) - Body ground Always 10 kΩ or higher
      A62-14 (+B2) or 3 (EFI MAIN NO. 1 relay holder) - Body ground Always 10 kΩ or higher
      A62-1 (+B3) or 3 (EFI MAIN NO. 1 relay holder) - Body ground Always 10 kΩ or higher
      A62-9 (MREL) or 1 (EFI MAIN NO. 1 relay holder) - Body ground Always 10 kΩ or higher
      5 (EFI MAIN NO. 1 relay holder) or positive (+) battery terminal - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. INSPECT EFI MAIN NO. 1 RELAY


    1. Inspect the EFI MAIN NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE EFI MAIN NO. 1 RELAY Click here

    OK

  4. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  5. REPLACE EFI MAIN NO. 1 RELAY


    1. Replace the EFI MAIN NO. 1 relay.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  7. RECHARGE OR REPLACE BATTERY


    1. Recharge or replace the battery.

      Result
      Proceed to
      NEXT

    NEXT

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END