Toyota Yaris: Sfi System / Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground (P011011)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground (P011011)

DESCRIPTION

The intake air temperature sensor, mounted on the mass air flow meter sub-assembly, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (see Fig. 1).

The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.

Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

HINT:

When DTC P011011 is stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P011011

Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground

The intake air temperature sensor output voltage is less than 0.142 V for 0.5 seconds or more (1 trip detection logic).

  • Short in intake air temperature sensor circuit
  • Intake air temperature sensor (mass air flow meter sub-assembly)
  • ECM

Comes on

SAE: P0112

HINT:

When a DTC is output, check the Data List item "Intake Air Temperature" using the GTS.

Click here

DTC No.

Intake Air Temperature

Malfunction

P011011

Higher than 128°C (262°F)

Short to ground in THA circuit

If the Data List displays a normal value, the normal value may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor (mass air flow meter sub-assembly) circuit, illuminates the MIL and stores a DTC.

Example:

If the intake air temperature sensor output voltage is less than 0.142 V for 0.5 seconds or more, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON.
  7. Turn the GTS on.
  8. Wait 0.5 seconds or more.
  9. Enter the following menus: Powertrain / Engine / Trouble Codes.
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P011011.
  13. Check the DTC judgment result.

    GTS 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 is malfunctioning.

WIRING DIAGRAM

Refer to DTC P010012.

Click here

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. 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.

READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)

*1

Mass Air Flow Meter Sub-assembly

*2

ECM

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Intake Air Temperature

(c) According to the display on the GTS, read the Data List.

OK:

GTS Display

Specified Condition

Intake Air Temperature

-40°C (-40°F)

HINT:

Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

Click here

OK

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

NG

2.

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D23-4(THA) or D104-106(THA) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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