FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Nissan-Datsun >> 2000 >> Altima GXE L4-2.4L (KA24DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0100

P0100




COMPONENT DESCRIPTION
The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the ECM. The temperature of the hot film is controlled by the ECM a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss.

Therefore, the ECM must supply more electric current to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.




CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECM ground).







ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the 1st trip DTC cannot be confirmed, perform "Procedure for malfunction B". If there is no problem on "Procedure for malfunction B", perform "Procedure for malfunction C". If there is no problem on "Procedure for malfunction C", perform "Procedure for malfunction D".

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

Procedure for malfunction A




With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 6 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

With Generic Scan Tools
1. Turn ignition switch "ON", and wait at least 6 seconds.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

Without Scan Tools
1. Turn ignition switch "ON", and wait at least 6 seconds.
2. Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
3. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Procedure for malfunction B







With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Start engine and wait 5 seconds at most.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

With Generic Tools
1. Turn ignition switch "ON".
2. Start engine and wait 5 seconds at most.
3. Select "MODE 7" with GST.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

Without Scan Tools
1. Turn ignition switch "ON".
2. Start engine and wait 5 seconds at most.
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.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

NOTE: If 1st trip DTC is confirmed after more than 5 seconds, there may be malfunction C.

Procedure for malfunction C

NOTE: If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch "ON") instead of running engine at idle speed.

With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Start engine and warm it up to normal operating temperature.
4. Run engine for at least 10 seconds at idle speed.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

With Generic Scan Tools
1. Start engine and warm it up to normal operating temperature.
2.Run engine for at least 10 seconds at idle speed.
3. Select "MODE 7" with GST.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

Without Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Run engine for at least 10 seconds at idle speed.
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.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Procedure for malfunction D







With Consult
1. Turn ignition switch "ON".
2. Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to "Diagnostic Procedure" below.
3. Select "DATA MONITOR" mode with CONSULT-II.
4. Check the voltage of MAS AIR/FL SE with "DATA MONITOR".
5. Increases engine speed to about 4,000 rpm.
6. Monitor the linear voltage rise in response to engine speed increases.
If NG, go to "Diagnostic Procedure" below. If OK, go to following step.
7. Maintain the following conditions for at least 10 consecutive seconds.
CMPS-RPM (REF): More than 2,000 rpm
THRTL POS SEN: More than 3V
Selector lever: Suitable position
Driving location: Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.
8. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip DTC might not be confirmed.

Procedure for malfunction D




With Generic Scan Tools
1. Turn ignition switch "ON".
2. Start engine and warm it up to normal operating temperature.
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.
6. If NG, go to "Diagnostic Procedure" below.

OR




Without Scan Tools
1. Turn ignition switch "ON".
2. Start engine and warm it up to normal operating temperature.
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.
5. If NG, go to "Diagnostic Procedure" below.

EC-MAFS-01:




EC-MAFS-01 - Connector View:




WIRING DIAGRAM

M8, E65:






DIAGNOSTIC PROCEDURE
If the trouble is duplicated after "Procedure for malfunction A or C", perform "Procedure A" below. If the trouble is duplicated after "Procedure for malfunction B or D", perform "Procedure B".

Diagnostic Procedure (Part 1 Of 2):




Diagnostic Procedure (Part 2 Of 2):




Procedure A

Diagnostic Procedure (Part 1 Of 2):




Diagnostic Procedure (Part 2 Of 2):




Procedure B

COMPONENT INSPECTION







Mass air flow sensor
1. Turn ignition switch "ON".
2. Start engine and warm it up to normal operating temperature.




3. Check voltage between ECM terminal (47) and ground.


pro multis Credits:Operation CHARM About Operation CHARM