Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1UR-FE ENGINE CONTROL
READ VALUE USING GTS (INTAKE AIR)
READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
DTC P0112 Intake Air Temperature Circuit Low Input
DTC P0113 Intake Air Temperature Circuit High Input
DESCRIPTION
- HINT:
- When DTC P0112 or P0113 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. The ECM continues operating in fail-safe mode until a pass condition is detected.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0112 | Short in the intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic). | Short in intake air temperature sensor circuit Intake air temperature sensor (built into mass air flow meter assembly) ECM |
| P0113 | Open in the intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic). | Open in intake air temperature sensor circuit Intake air temperature sensor (built into mass air flow meter assembly) ECM |
- HINT:
- When either of these DTCs is stored, check the intake air temperature by entering the following menus: Powertrain / Engine and ECT / All Data / Intake Air.
| Temperature Displayed | Malfunction |
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) or higher | Short circuit |
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 and stores a DTC.
Example:
If the sensor output voltage is higher than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the intake air temperature sensor circuit and stores DTC P0113. Conversely, if the output voltage is below 0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit and stores DTC P0112.
If the malfunction is not repaired successfully, a DTC is stored 0.5 seconds after the engine is next started.
CONFIRMATION DRIVING PATTERN
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. 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.
| 1.READ VALUE USING GTS (INTAKE AIR) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / All Data / Intake Air.
Read the value displayed on the GTS.
- OK:
- Same as actual intake air temperature
| Result | Proceed to |
| -40°C (-40°F) | A |
| 140°C (284°F) or higher | B |
| Same as actual intake air temperature | C |
- HINT:
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| A | |
| 2.READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS) |
Disconnect the mass air flow meter connector.
Connect terminals 4 (THA) and 5 (E2) of the mass air flow meter wire harness side connector.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / All Data / Intake Air.
Read the value displayed on the GTS.
- Standard value:
- 140°C (284°F) or higher
| *1 | Mass air flow meter assembly |
| *2 | ECM |
| *a | Front view of wire harness connector (to Mass Air Flow Meter Assembly) |
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| OK | ||
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| 3.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
Disconnect the mass air flow meter connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RHD Tester Connection Condition Specified Condition C50-4 (THA) - C46-73 (THA) Always Below 1 Ω C50-5 (E2) - C46-98 (E2) Always Below 1 Ω for LHD Tester Connection Condition Specified Condition C50-4 (THA) - C45-73 (THA) Always Below 1 Ω C50-5 (E2) - C45-98 (E2) Always Below 1 Ω
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| OK | ||
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| 4.READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS) |
Disconnect the mass air flow meter connector.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / All Data / Intake Air.
Read the value displayed on the GTS.
- Standard value:
- -40°C (-40°F)
| *1 | Mass Air Flow Meter Assembly |
| *2 | ECM |
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| OK | ||
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| 5.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
Disconnect the mass air flow meter connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RHD Tester Connection Condition Specified Condition C50-4 (THA) or C46-73 (THA) - Body ground Always 10 kΩ or higher for LHD Tester Connection Condition Specified Condition C50-4 (THA) or C45-73 (THA) - Body ground Always 10 kΩ or higher
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| OK | ||
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