DTC P0101:00

MAF sensor circuit range/performance problem

DETECTION CONDITION

When the conditions are as follows, the PCM compares the intake airflow amount with the estimated intake airflow amount (calculated from the barometric pressure, MAP sensor and throttle opening angle).
MONITORING CONDITIONS
- Engine speed: below 4, 500 rpm
- Barometric pressure divided by intake manifold absolute pressure: above 1.2
- Throttle position-throttle position before 20 ms: below 10 %
- Battery voltage: above 8 V
If over a period continuing for 5 s, the cumulative value of the intake airflow amount divided by the estimated intake airflow amount is 1.35 or more, and intake airflow amount multiplied by the estimated intake airflow amount is 6 g/s {0.8 lb/min} or more, the PCM determines that the detected mass air flow amount is above is too high.
If over a period continuing for 5 s , the cumulative value of the intake airflow amount divided by the estimated intake airflow amount is 0.65 or less, and intake airflow amount multiplied by the estimated intake airflow amount is 6 g/s {0.8 lb/min} or less , the PCM determines that the detected mass air flow amount is above is too low.

Diagnostic support note

This is a continuous monitor (CCM).
The MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

MAF sensor connector or terminals malfunction
PCM connector or terminals malfunction
MAF sensor malfunction
MAP sensor malfunction
PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND STORED DTC Switch the ignition to off, then to ON (engine off). Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the DTC P2108:00 also present?	Yes	Go to the applicable DTC inspection. (See DTC P2108:00 ).
3		No	Go to the next step.
4	VERIFY CURRENT INPUT SIGNAL STATUS IS CONCERN INTERMITTENT OR CONSTANT Start the engine. Access the following PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST ). ECT ECT2 TP REL RPM Warm up the engine until ECT and ECT2 PIDs are above -200°C {-392°F} . Idle the engine for 5 s or more. CAUTION: While performing this step, always operate the vehicle in a safe and lawful manner. When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. Drive the vehicle under the following two PID conditions: Condition 1 TP REL: 50-87.5 % RPM: above 500 rpm 4th gear (MTX), D range (ATX) Condition 2 TP REL: above 80% RPM: below 2, 000 rpm Gear in Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the PENDING CODE for this DTC present?	Yes	Go to the next step.
4		No	Intermittent concern exists. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING" procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING ).
5	INSPECT MAF/IAT SENSOR CONNECTOR CONDITION Switch the ignition to off. Disconnect the MAF/IAT sensor connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 9.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR CONDITION Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 9.
6		No	Go to the next step.
7	INSPECT MAF SENSOR Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the MAF/IAT sensor, then go to Step 9. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ).
7		No	Go to the next step.
8	INSPECT MAP SENSOR Inspect the MAP sensor. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the MAP sensor, then go to the next step. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to connect all disconnected connectors. Switch the ignition to ON (engine off). Clear the DTC from PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). Start the engine. Warm up the engine until ECT and ECT2 PIDs are above -200°C {-392°F} . Idle engine for 5 s or more . CAUTION: While performing this step, always operate the vehicle in a safe and lawful manner. When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. Drive the vehicle under the following two PID conditions: Condition 1 TP REL 50-87.5% RPM: above 500 rpm 4th gear (MTX), D range (ATX) Condition 2 TP REL: above 80% RPM: below 2, 000 rpm Gear in Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION ). Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
10		No	DTC troubleshooting completed.