P0098
2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0097,P0098,P0112,P0113: Intake Air Temperature Sensor 2 Circuit Low
P0113 - Intake Air Temperature Circuit High Input
DESCRIPTION
- The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT. The IAT sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the IAT 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 IAT sensor is powered by a 5 V supply from the THA and THA2 terminals of the ECM, via resistor R.
- Resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes, according to changes in the IAT, the voltage at terminal THA and THA2 also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve drivability.
HINT
When DTC P0097, P0098, P0112 or P0113 is set, the ECM enters fail-safe mode. During fail-safe mode, the IAT is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.
HINT
When any of these DTCs are set, check the IAT by entering the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air #1 or Intake Air #2.
MONITOR DESCRIPTION
The ECM monitors the sensor voltage and uses this value to calculate the Intake Air Temperature (IAT). When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the IAT sensor and sets a DTC.
Example:
If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the IAT sensor circuit, and sets DTC P0098 or P0113. Conversely, if the output voltage is less than 0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0097 or P0112.
If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0097 and P0112:
P0098 and P0113:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
- When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
- If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
- Read freeze frame data using the Techstream. 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.
PROCEDURE
1. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air #1 or Intake Air #2.
(e) Read the value displayed on the Techstream.
Standard:
Same as actual Intake Air Temperature (IAT).
Result
HINT
- If there is an open circuit, the Techstream indicates -40°C (-40°F).
- If there is a short circuit, the Techstream indicates 140°C (284°F) or higher.
C -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
B -- READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)
(a) Disconnect the E13 or E22 MAF meter connector.
(b) Connect terminals THA and E2 or THAR and E2R of the MAF meter wire harness side connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Turn the Techstream ON.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air #1 or Intake Air #2.
(g) Read the value displayed on the Techstream.
Standard:
140°C (284°F) or higher
NG -- READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM)
OK -- CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER Removal
3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM)
(a) Disconnect the E13 or E22 MAF meter connector.
(b) Connect terminals THA and E2 or THA2 and E2 of the E1 ECM connector.
HINT
Before checking, do visual and contact pressure checks on the ECM connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Turn the Techstream ON.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air #1 or Intake Air #2.
(g) Read the value displayed on the Techstream.
Standard:
140°C (284°F) or higher
NG -- CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM Removal
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR
4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
(a) Disconnect the E13 or E22 MAF meter connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream ON.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air #1 or Intake Air #2.
(f) Read the value displayed on the Techstream.
Standard:
-40°C (-40°F)
NG -- READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM)
OK -- REPLACE MASS AIR FLOW METER Removal
5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM)
(a) Disconnect the E13 or E22 MAF meter connector.
(b) Disconnect the E1 ECM connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Turn the Techstream ON.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air #1 or Intake Air #2.
(g) Read the value displayed on the Techstream.
Standard:
-40°C (-40°F)
NG -- REPLACE ECM Removal
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR