ECD SYSTEM(for Swirl Control Valve), 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 has decreased.

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

DTC No.

DTC Detection Condition

Trouble Area

P0100

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 relay

  • ECM

WIRING DIAGRAM

A311425E04

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.

Tip:

  • 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).

    RECHARGE OR REPLACE BATTERYClick here

  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 relay from the engine room No. 1 relay block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A76-4 (E1) - Body ground

      Always

      Below 1 Ω

      A76-5 (E2) - Body ground

      Always

      Below 1 Ω

      A76-17 (E3) - Body ground

      Always

      Below 1 Ω

      A76-18 (E4) - Body ground

      Always

      Below 1 Ω

      A76-15 (BATT) - positive (+) battery terminal

      Always

      Below 1 Ω

      A76-2 (+B) - 3 (EFI MAIN relay holder)*1

      A76-2 (+B) - 5 (EFI MAIN relay holder)*2

      Always

      Below 1 Ω

      A76-14 (+B2) - 3 (EFI MAIN relay holder)*1

      A76-14 (+B2) - 5 (EFI MAIN relay holder)*2

      Always

      Below 1 Ω

      A76-1 (+B3) - 3 (EFI MAIN relay holder)*1

      A76-1 (+B3) - 5 (EFI MAIN relay holder)*2

      Always

      Below 1 Ω

      A76-9 (MREL) - 2 (EFI MAIN relay holder)

      Always

      Below 1 Ω

      5 (EFI MAIN relay holder) - positive (+) battery terminal*1

      3 (EFI MAIN relay holder) - positive (+) battery terminal*2

      Always

      Below 1 Ω

      1 (EFI MAIN relay holder) - Body ground

      Always

      Below 1 Ω

      A76-15 (BATT) or positive (+) battery terminal - Body ground

      Always

      10 kΩ or higher

      A76-2 (+B) or 3 (EFI MAIN relay holder) - Body ground*1

      A76-2 (+B) or 5 (EFI MAIN relay holder) - Body ground*2

      Always

      10 kΩ or higher

      A76-14 (+B2) or 3 (EFI MAIN relay holder) - Body ground*1

      A76-14 (+B2) or 5 (EFI MAIN relay holder) - Body ground*2

      Always

      10 kΩ or higher

      A76-1 (+B3) or 3 (EFI MAIN relay holder) - Body ground*1

      A76-1 (+B3) or 5 (EFI MAIN relay holder) - Body ground*2

      Always

      10 kΩ or higher

      A76-9 (MREL) or 2 (EFI MAIN relay holder) - Body ground

      Always

      10 kΩ or higher

      5 (EFI MAIN relay holder) or positive (+) battery terminal - Body ground*1

      3 (EFI MAIN relay holder) or positive (+) battery terminal - Body ground*2

      Always

      10 kΩ or higher

      • *1: for LHD

      • *2: for RHD

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

  3. INSPECT EFI MAIN RELAY

    1. Inspect the EFI MAIN relay (Click hereClick here).

    REPLACE EFI MAIN RELAYClick here

  4. REPLACE ECM

    1. Replace the ECM (Click here).

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. RECHARGE OR REPLACE BATTERY

    1. Recharge or replace the battery.

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  7. REPLACE EFI MAIN RELAY

    1. Replace the EFI MAIN relay.

  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 (Click here).

    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.

    8. Confirm that the DTC is not output again.

    END