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Home >> Toyota >> 2006 >> Corolla CE, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) (2ZZ-GE) - Diagnostics) >> DTC P0100, P0102, P0103: Mass Or Volume Air Flow Circuit Low/High Input >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

HINT: Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record 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, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

  1. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL (MASS AIR FLOW RATE) 
    1. Connect a hand-held tester or OBD II scan tool to the DLC3.
    2. Start the engine.
    3. Turn the tester or scan tool ON.
    4. On the tester, select the following menu items: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF.
    5. Read the values displayed on the tester.
    6. If using an OBD II scan tool, refer to the instruction manual .

      Result: 

      MASS AIR FLOW SENSOR TEST RESULT

      Mass Air Flow Rate (gm/s) Proceed To
      0.0 A
      271.0 or more B
      Between 1.0 and 270.0 ((1)) C
      (1) The value must be changed when the throttle valve is open or closed.
    1. B: Go to step   6 
    2. C:  CHECK FOR INTERMITTENT PROBLEMS  

      A: GO TO NEXT STEP 

  2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
    1. Disconnect the M1 Mass Air Flow (MAF) meter connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the terminal of the wire harness side connector and body ground.

      Standard: 

      MASS AIR FLOW METER (POWER SOURCE VOLTAGE)

      Tester Connections Specified Conditions
      +B (M1-1) - Body ground Between 9 V and 14 V
    4. Reconnect the MAF meter connector.
      Fig 1: Inspecting Mass Air Flow Meter (Power Source Voltage)
      G02599203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step   5 
    2. OK: GO TO NEXT STEP 
  3. INSPECT ECM (VG VOLTAGE) 
    1. Start the engine.
    2. Measure the voltage between the terminals of the E3 ECM connector.

      Standard: 

      ECM (VG VOLTAGE)

      Tester Connections Conditions Specified Conditions
      VG (E3-30) -EVG (E3-29) Engine idling Between 0.5 V and 3.0 V
      Fig 2: Inspecting ECM (VG Voltage)
      G02599204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE ECM (See  ECM (1ZZ-FE/2ZZ-GE) REPLACEMENT  ) 
    2. NG: GO TO NEXT STEP 
  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the M1 MAF meter connector.
    2. Disconnect the E3 ECM connector.
    3. Check the resistance.

      Standard (Check for open): 

      MASS AIR FLOW METER - ECM RESISTANCE (CHECK FOR OPEN)

      Tester Connections Specified Conditions
      VG (M1-3)-VG (E3-30) Below 1 Ω
      E2G (M1-2) - EVG (E3-29) Below 1 Ω
      Fig 3: Identifying MAF Meter Connector Terminals
      G02599205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      MASS AIR FLOW METER - ECM RESISTANCE (CHECK FOR SHORT)

      Tester Connections Specified Conditions
      VG (M1-3) or VG (E3-30) - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.
      Fig 4: Disconnecting E3 ECM Connector
      G02599206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 

      REPLACE MASS AIR FLOW METER 

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI RELAY) 
    1. Remove the EFI relay from the engine room R/B.
    2. Disconnect the M1 MAF meter connector.
    3. Check the resistance.

      Standard (Check for open): 

      MASS AIR FLOW METER - EFI RELAY RESISTANCE (CHECK FOR OPEN)

      Tester Connection Specified Condition
      +B (M1-1)-EFI relay (3) Below 1 Ω

      Standard (Check for short): 

      MASS AIR FLOW METER - EFI RELAY RESISTANCE (CHECK FOR SHORT)

      Tester Connection Specified Condition
      +B (M1-1) or EFI relay (3) - Body ground 10 kΩ or higher
      Fig 5: Identifying Location Of EFI Relay
      G02599207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the MAF meter connector.
    5. Reinstall the EFI relay.
      Fig 6: Identifying M1 MAF Meter Connector Terminals
      G02599208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 

      INSPECT ECM POWER SOURCE CIRCUIT (See  ECM POWER SOURCE CIRCUIT  ) 

  6. INSPECT ECM (SENSOR GROUND) 
    1. Check the resistance.

      Standard: 

      ECM (SENSOR GROUND) RESISTANCE

      Tester Connection Specified Condition
      EVG (E3-29) - Body ground Below 1 Ω
      Fig 7: Inspecting ECM (Sensor Ground)
      G02599209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE ECM (See  ECM (1ZZ-FE/2ZZ-GE) REPLACEMENT  ) 
    2. OK: GO TO NEXT STEP 
  7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the M1 MAF meter connector.
    2. Disconnect the E3 ECM connector.
    3. Check the resistance.

      Standard (Check for open): 

      MASS AIR FLOW METER - ECM RESISTANCE (CHECK FOR OPEN)

      Tester Connection Specified Condition
      VG (M1-3)-VG (E3-30) Below 1 Ω
      E2G (M1-2) - EVG (E3-29) Below 1 Ω

      Standard (Check for short): 

      MASS AIR FLOW METER - ECM RESISTANCE (CHECK FOR SHORT)

      Tester Connection Specified Condition
      VG (M1-3) or VG (E3-30) - Body ground 10 kΩ or higher
      Fig 8: Identifying Terminals Of M1 MAF Meter Connector
      G02599210Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.
      Fig 9: Disconnecting E3 ECM Connector
      G02599211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
      2. OK: GO TO NEXT STEP 

        REPLACE MASS AIR FLOW METER 

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