Air Flow Meter/Sensor: Testing and Inspection

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE




Perform "Procedure for malfunction A" first. If DTC cannot be confirmed, perform "Procedure for malfunction B". If DTC still cannot be confirmed, perform "OVERALL FUNCTION CHECK", "Procedure for malfunction C".

Procedure for malfunction A

With Consult
(1) Turn ignition switch "ON", and wait at least 6 seconds.
(2) Select "DATA MONITOR" mode with CONSULT
(3) Start engine and wait at least 3 seconds.

OR

With GST
(1) Turn ignition switch "ON", and wait at least 6 seconds.
(2) Start engine and wait at least 3 seconds.
(3) Select "MODE 3" with GST

OR

Without Scan Tools
(1) Turn ignition switch "ON", and wait at least 6 seconds.
(2) Start engine and wait at least 3 seconds.
(3) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(4) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

Procedure for malfunction B

With Consult
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT
(3) Start engine and warm it up sufficiently.
(4) Run engine for at least 10 seconds at idle speed.

OR

With GST
(1) Turn ignition switch "ON".
(2) Start engine and warm it up sufficiently.
(3) Run engine for at least 10 seconds at idle speed.
(4) Select "MODE 3" with GST

OR

Without Scan Tools
(1) Turn ignition switch "ON".
(2) Start engine and warm it up sufficiently.
(3) Run engine for at least 10 seconds at idle speed.
(4) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(5) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a DTC might not be confirmed.

Procedure for malfunction C

With Consult
(1) Turn ignition switch "ON".
(2) Start engine and warm it up sufficiently.
(3) Select "DATA MONITOR" mode with CONSULT.




(4) Check the voltage of mass air flow sensor with DATA MONITOR".
(5) Check for linear voltage rise in response to increases to about 4,000 rpm in engine speed.

OR

With GST
(1) Turn ignition switch "ON".
(2) Start engine and warm it up sufficiently.
(3) Select "MODE 1" with GST.




(4) Check the mass air flow with "MODE 1".
(5) Check for linear mass air flow rise in response to increases to about 4,000 rpm in engine speed.

OR

Without Scan Tools
(1) Turn ignition switch "ON".
(2) Start engine and warm it up sufficiently.




(3) Check the voltage between ECM terminal (47) and ground.
(4) Check for linear voltage rise in response to increases to about 4,000 rpm in engine speed.

CIRCUIT DIAGRAM

EC-MAFS-01 Mass Air Flow Sensor (MAFS) (DTC: 0102):

DIAGNOSTIC PROCEDURE

Diagnostic Flow Chart:

COMPONENT INSPECTION

Mass air flow sensor
1. Turn ignition switch "ON".
2. Start engine and warm it up sufficiently.




3. Check voltage between terminal (1) and ground.




Remarks * Check for linear voltage rise in response to increases to about 4,000 rpm in engine speed.





4. If NG, remove mass air flow sensor from air duct. Check hot wire for damage or dust.