Curiosii for ever!: Car repair manuals for everyone.
Home >> Toyota >> 2010 >> Camry V6-3.5L (2GR-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0112

P0112





2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0112,P0113: Intake Air Temperature Circuit Low 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 drops, the resistance of the thermistor increases. When the temperature rises, 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 terminal 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 also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

HINT
When any of DTCs P0112 and P0113 are 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 on the Techstream: Powertrain / Engine / Data List / All Data / Intake Air.





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 -40°C (-40°F) for 0.5 seconds or more, the ECM determines that there is an open in the IAT sensor circuit, and sets DTC P0113. Conversely, if the output voltage is more than 140°C (284°F) for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC 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

P0112:

P0112::





P0113:

P0113::





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the ignition switch to ON and turn the Techstream on.

- Clear the DTCs (even if no DTCs are stored, perform the Clear DTC procedure) DTC Check / Clear.

- Turn the ignition switch off and turn the Techstream off.

- Turn the ignition switch to ON and turn the Techstream on.

- Wait 0.5 seconds or more [A].

- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0112 or P0113.

- Check the DTC judgment result [B].





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

- If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

- Read Pending DTCs.

HINT
If a pending DTC is output, the system is malfunctioning.

- If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM





INSPECTION PROCEDURE

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. READ VALUE USING INTAKE AIR TEMPERATURE SENSOR (INTAKE AIR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.

(e) Read the value displayed on the tester.

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).
C -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

B -- CHECK MASS AIR FLOW METER (CHECK FOR SHORT IN SENSOR)
A -- Continue to next step.

2. CHECK MASS AIR FLOW METER (CHECK FOR OPEN IN SENSOR)

(a) Confirm good connection of the Mass Air Flow (MAF) meter.





(b) Disconnect the MAF meter connector.

(c) Connect terminals THA and E2 of the MAF meter wire harness side connector.

(d) Connect the Techstream to the DLC3.

(e) Turn the ignition switch to ON.

(f) Turn the tester on.

(g) Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.

(h) Read the value displayed on the tester.

Standard:

140°C (284°F)

(i) Reconnect the MAF meter connector.

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

OK -- REPLACE MASS AIR FLOW METER Removal

3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

(a) Disconnect the MAF meter connector.





(b) Disconnect the ECM connector.

(c) Measure the resistance between the terminals.

Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the MAF meter connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

4. CHECK MASS AIR FLOW METER (CHECK FOR SHORT IN SENSOR)

(a) Disconnect the MAF meter connector.





(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / All Data / Intake Air.

(f) Read the value displayed on the tester.

Standard:

-40°C (-40°F)

(g) Reconnect the MAF meter connector.

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

OK -- REPLACE MASS AIR FLOW METER Removal

5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER- ECM)

(a) Disconnect the MAF meter connector.





(b) Disconnect the ECM connector.

(c) Measure the resistance between the terminals.

Standard resistance:





(d) Reconnect the MAF meter connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal
pro multis · Curiosii