Description
The mass air flow sensor (1) is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The greater air flow, the greater the heat loss.
Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0102
3.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-I
4.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-II
Diagnosis Procedure
Regarding Wiring Diagram information
1.INSPECTION START
Confirm the detected DTC.
2.CHECK INTAKE SYSTEM
Check the following for connection.
3.CHECK GROUND CONNECTION
4.CHECK MAF SENSOR POWER SUPPLY CIRCUIT
5.DETECT MALFUNCTIONING PART
Check the following.
6.CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
7.CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
8.CHECK MASS AIR FLOW SENSOR
9.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK MASS AIR FLOW SENSOR-I
With CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
2.CHECK FOR THE CAUSE OF UNEVEN AIR FLOW VIA THE MASS AIR FLOW SENSOR
Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
3.CHECK MASS AIR FLOW SENSOR-II
With CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
4.CHECK MASS AIR FLOW SENSOR-III
With CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Front wiper motor ground circuit
Diagnosis Procedure
1.CHECK FRONT WIPER MOTOR (GND) OPEN CIRCUIT
Turn the ignition switch OFF.
Disconnect front wiper motor.
Check continuity between front wiper motor harness connector
and ground.
...
U1000 CAN comm circuit
Description
CAN (Controller Area Network) is a serial communication
line for real time applications. It is an on-vehicle multiplex
communication line with high data communication speed and excellent error
detection ability. Modern
vehicle is equipped with many electronic control unit, and e ...
U1200 AV control unit
Description
Part name
Description
AV CONTROL UNIT
It is the master unit of the MULTI AV system and it is connected
to each control unit by means of communication. It operates each
system according to communication signals from the AV contro ...