- Engine coolant temperature is more than 70°C (158°F) or more
- Engine speed is less than 2,000 rpm
| Last Modified: 4-30-2014 | 6.6 C | Doc ID: RM000000UBW006X |
| Model Year: 2006 | Model: LX470 | Prod Date Range: [05/2005 - ] |
| Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass Air Flow Circuit Range / Performance Problem; 2006 MY LX470 [05/2005 - ] | ||
|
DTC |
P0101 |
Mass Air Flow Circuit Range / Performance Problem |
DESCRIPTION
Refer to DTCs P0100
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|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0101 |
Mass Air Flow (MAF) meter voltage is higher than MAF meter voltage based on throttle position when the following conditions are met (2 trip detection logic): |
Mass Air Flow (MAF) meter |
|
P0101 |
Mass Air Flow (MAF) meter voltage is lower than MAF meter voltage based on throttle position when the following conditions are met (2 trip detection logic):
|
Mass Air Flow (MAF) meter |
MONITOR DESCRIPTION
The Mass Air Flow (MAF) meter helps the ECM calculate the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and provide a proper air fuel ratio. Inside the MAF meter, there is a heated platinum wire exposed to the flow of intake air. By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools 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 air flow through the sensor. The ECM interprets this voltage as the intake air amount. If there is a defect in the sensor or an open or short circuit, the voltage level will deviate outside the normal operating range. The ECM interprets this deviation as a defect in the MAF meter and sets a DTC.
Example:
If the MAF meter voltage is higher than 2.2 V when the engine is idling, the ECM sets P0101 (2 trip detection logic). If the MAF meter voltage is less than 1.0 V when the throttle valve is opened, the ECM sets DTC P0101 (2 trip detection logic).
MONITOR STRATEGY
|
Related DTCs |
P0101: MAF Meter Rationality (low voltage) P0101: MAF Meter Rationality (high voltage) |
|
Required Sensors/Components (Main) |
MAF meter |
|
Required Sensors/Components (Related) |
Crankshaft position sensor, ECT sensor, Throttle position sensor |
|
Frequency of Operation |
Continuous |
|
Duration |
10 seconds |
|
MIL Operation |
2 driving cycles |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
ALL:
|
Monitor will run whenever these DTCs are not present |
P0115 - P0118 (ECT sensor) P0120 - P0223, P2135 (TP sensor) P0125 (insufficient ECT for closed loop) P0335 (CKP sensor) P0340, P0341 (CMP sensor) |
Mass air flow meter rationality (high voltage)
|
Engine speed |
Less than 2,000 rpm |
|
Engine coolant temperature |
70°C (158°F) or more |
Mass air flow meter rationality (low voltage)
|
Engine speed |
More than 300 rpm |
|
Fuel cut |
OFF |
TYPICAL MALFUNCTION THRESHOLDS
Mass air flow meter rationality (high voltage)
|
Mass air flow meter voltage |
More than 2.2 V (varies with throttle position) |
Mass air flow meter rationality (low voltage)
|
Mass air flow meter voltage |
Less than 1.0 V (varies with throttle position) |
COMPONENT OPERATING RANGE
|
Mass air flow meter voltage |
Between 0.4 and 2.2 V |
WIRING DIAGRAM
Refer to DTCs P0100
.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
PROCEDURE
|
1. |
CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101) |
(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
(b) Turn the ignition switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read the DTCs.
|
Display (DTC output) |
Proceed to |
|---|---|
|
P0101 and other codes are output |
A |
|
Only P0101 is output |
B |
HINT:
If any other codes besides P0101 are output, perform troubleshooting for those DTCs first.
| B |
|
| A |
|
|
|