DTC    P0102    Mass Air Flow Circuit Low

DTC    P0103    Mass Air Flow Circuit High

DTC    P010C    Mass or Volume Air Flow "A" Circuit Low Input

DTC    P010D    Mass or Volume Air Flow "A" Circuit High Input

для подготовки Нажмите здесь


DESCRIPTION

The Mass Air Flow (MAF) meter is a sensor that measures the amount of air flowing through the valve.
The ECM uses this information to determine the fuel injection time and to provide appropriate air-fuel ratio.
Inside the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air.
By applying a specific electrical current to the wire, the ECM heats it to a given temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.
The circuit is constructed so that the platinum hot wire and the temperature sensor provide a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined temperature.

УКАЗАНИЕ:
When any of these DTCs are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine RPM and throttle valve position. Fail-safe mode continues until a pass condition is detected.


A148357E01


DTC No.
DTC Detection Condition
Trouble Area
P0102
P010C
Open in Mass Air Flow (MAF) meter circuit for 3 seconds
  1. Open in MAF meter circuit
  1. Short in MAF meter circuit
  1. MAF meter
  1. ECM
P0103
P010D
Short in Mass Air Flow (MAF) meter circuit for 3 seconds
  1. Short in MAF meter circuit (+B circuit)
  1. MAF meter
  1. ECM

УКАЗАНИЕ:
When any of these DTCs are set, check the air-flow rate by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / MAF Bank 1 or MAF Bank 2.

Mass Air Flow Rate (g/sec.)
Malfunctions
Approximately 0.0
  1. Open in Mass Air Flow (MAF) meter power source circuit
  2. Open or short in VG circuit
271.0 or more
  1. Open in EVG circuit


MONITOR DESCRIPTION

If there is a defect in the MAF meter or an open short circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the MAF meter and sets a DTC.
Example:
When the sensor output voltage remains less than 0.2 V, or more than 4.9 V, for more than 3 seconds, the ECM sets a DTC.
If the malfunction is not repaired successfully, a DTC is set 3 seconds after the engine is next started.

WIRING DIAGRAM


A147854E02


INSPECTION PROCEDURE

УКАЗАНИЕ:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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 INTELLIGENT TESTER (MASS AIR FLOW RATE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the tester ON.

  1. Wait 30 seconds with the engine stopped.

  1. Enter the following menus: Powertrain / Engine / Data List / MAF Bank 1 or MAF Bank 2.

  1. Read the values displayed on the tester.


Result:

Mass Air Flow Rate (g/sec.)
Proceed to
0.0
A
0.26 or more
B
Between 1.0 and 0.25*
C

*: The value must change when the throttle valve is open or closed.


B
Перейдите к шагу 6

C
CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)
A


2.INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE)
A148358E01

  1. Disconnect the E13 or E22 MAF meter connector.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E13-3 (+B) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    E22-3 (+B) - Body ground
    		Engine switch on (IG)
    		11 to 14 V



NG
Перейдите к шагу 5
OK


3.INSPECT ECM (VG VOLTAGE)
A124678E20

  1. Start the engine.

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

    УКАЗАНИЕ:
    The transmission gear selector lever should be in the P or N position and the A/C switch should be turned OFF.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E1-25 (VG) - E1-24 (E2G)
    		Engine idling
    		0.5 to 3.0 V
    E1-23 (VG2) - E1-32 (E2G2)
    		Engine idling
    		0.5 to 3.0 V



OK
REPLACE ECM (Нажмите здесь)
NG


4.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
A148359E01

  1. Disconnect the E13 or E22 MAF meter connector.

  1. Disconnect the E1 ECM connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    E13-1 (VG) - E1-25 (VG)
    		Always
    		Below 1 Ω
    E13-2 (E2G) - E1-24 (E2G)
    		Always
    		Below 1 Ω
    E22-1 (VGR) - E1-23 (VG2)
    		Always
    		Below 1 Ω
    E22-2 (EVGR) - E1-32 (E2G2)
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    E13-1 (VG) or E1-25 (VG) - Body ground
    		Always
    		10 kΩ or higher
    E22-1 (VGR) or E1-23 (VG2) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MASS AIR FLOW METER (BANK 1 OR BANK 2) (Нажмите здесь)  

5.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI FUSE)
A149596E02

  1. Remove the EFI fuse from the engine room No. 2 relay block.

  1. Inspect the fuse.

    1. Measure the resistance of the EFI fuse.

      Standard resistance:
      Below 1 Ω

  1. Disconnect the E13 or E22 MAF meter connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    E13-3 (+B) - EFI fuse terminal 2
    		Always
    		Below 1 Ω
    E22-3 (+B) - EFI fuse terminal 2
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    E13-3 (+B) or EFI fuse terminal 2 - Body ground
    		Always
    		10 kΩ or higher
    E22-3 (+B) or EFI fuse terminal 2 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT (Нажмите здесь)  

6.INSPECT ECM (SENSOR GROUND)
A124678E32

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E1-24 (E2G) - Body ground
    		Always
    		Below 1 Ω
    E1-32 (E2G2) - Body ground
    		Always
    		Below 1 Ω



NG
REPLACE ECM (Нажмите здесь)
OK


7.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
A148359E01

  1. Disconnect the E13 or E22 MAF meter connector.

  1. Disconnect the E1 ECM connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    E13-1 (VG) - E1-25 (VG)
    		Always
    		Below 1 Ω
    E13-2 (E2G) - E1-24 (E2G)
    		Always
    		Below 1 Ω
    E22-1 (VGR) - E1-23 (VG2)
    		Always
    		Below 1 Ω
    E22-2 (EVGR) - E1-32 (E2G2)
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    E13-1 (VG) or E1-25 (VG) - Body ground
    		Always
    		10 kΩ or higher
    E22-1 (VGR) or E1-23 (VG2) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MASS AIR FLOW METER (BANK OR BANK 2) (Нажмите здесь)