Lexus ES: Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range (P01102A)
DESCRIPTION
Refer to DTC P011011.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P01102A | Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range | Either of the following conditions is met (2 trip detection logic):
| Mass air flow meter sub-assembly | Comes on | DTC stored | SAE Code: P0111 |
MONITOR DESCRIPTION
The ECM performs OBD II monitoring based on the values from the intake air temperature sensor (mass air flow meter sub-assembly). If there is no change of the sensor value within the normal range, the ECM will not be able to perform OBD II monitoring or will misdiagnose that there is a malfunction in the sensor. The ECM detects when the intake air temperature sensor value is stuck by performing monitoring after the engine switch is turned off or the engine is started (short soak or long soak).
MONITOR STRATEGY
| Related DTCs | P0111: Intake air temperature sensor rationality (after engine stop) P0111: Intake air temperature sensor rationality (after cold engine start) |
| Required Sensors/Components (Main) | Intake air temperature sensor (mass air flow meter sub-assembly) |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Once per driving cycle |
| Duration | - |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
After Engine Stop| All of the following conditions are met | - |
| Time after engine start | 10 seconds or more |
| Battery voltage | 10.5 V or higher |
| Engine coolant temperature at internal engine off timer | -40°C (-40°F) or higher |
| Engine coolant temperature before engine stop | 70°C (158°F) or higher |
| Time that mass air flow is low before engine stop | 2100 seconds or more |
| Accumulated mass air flow amount before engine stop | 1940 g or more |
| Key-off duration | 30 minutes |
| Mass air flow meter circuit fail (P0102, P0103) | Not detected |
| Intake air temperature sensor circuit fail (P0112, P0113) | Not detected |
| Engine coolant temperature sensor circuit fail (P0117, P0118) | Not detected |
| Soak timer fail (P2610) | Not detected |
| All of the following conditions are met | - |
| Key-off duration | 5 hours or more |
| Time after engine start | 10 seconds or more |
| Engine coolant temperature | 70°C (158°F) or higher |
| Accumulated mass air flow amount | 1940 g or more |
| Either of the following conditions is met | 1 or 2 |
| 1. Duration while engine load is low | 120 seconds or more |
| 2. Duration while engine load is high | 10 seconds or more |
| Mass air flow meter circuit fail (P0102, P0103) | Not detected |
| Intake air temperature sensor circuit fail (P0112, P0113) | Not detected |
| Engine coolant temperature sensor circuit fail (P0117, P0118) | Not detected |
| Soak timer fail (P2610) | Not detected |
TYPICAL MALFUNCTION THRESHOLDS
After Engine Stop| Intake air temperature change | Less than 1°C (1.8°F) |
| Intake air temperature change | Less than 1°C (1.8°F) |
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
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-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG) [A].
- Turn the Techstream on.
- Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
-
Idle the engine for 5 minutes or more [C].
HINT:
During steps [A] through [C], if the change in the intake air temperature is less than 1°C (1.8°F), the intake air temperature sensor (mass air flow meter sub-assembly) is malfunctioning. It is not necessary to continue this procedure.
- Enter the following menus: Powertrain / Engine / Trouble Codes [D].
-
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
-
[A] to [D]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P01102A.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [E] through [F].
-
Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [E].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
-
Check the DTC judgment result again [F].
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [E] through [F] again.
-
[A] to [F]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
WIRING DIAGRAM
Refer to DTC P010012.
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CAUTION / NOTICE / HINT
HINT:
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P01102A) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Powertrain > Engine > Trouble Codes| Result | Proceed to |
|---|---|
| DTC P01102A and other DTCs are output | A |
| DTC P01102A is output | B |
HINT:
If any DTCs other than P01102A are output, troubleshoot those DTCs first.
| A | .gif) | GO TO DTC CHART |
| B | | INSPECT MASS AIR FLOW METER SUB-ASSEMBLY |
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