DTC P0110 Intake Air Temperature Circuit : DTC P0112 Intake Air Temperature Circuit Low Input : DTC P0113 Intake Air Temperature Circuit High Input: Wiring Diagram

Fig 1: Intake Air Temperature Circuit Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

• 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 intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 OUTPUT DTC 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON and turn the tester ON.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   4. Read DTCs.

   Result 

   RESULT CHART
   
   

   Display (DTC Output)	Proceed to
   P0110	A
   P0112	B
   P0113	C

   B : GO TO STEP   5 

   C : GO TO STEP   4 

   A : Go to next step 

2. READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Turn the tester ON.
   4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
   5. Read the value displayed on the tester.

   Standard: 

   Same as the actual Intake Air Temperature (IAT). 

   Result 

   RESULT CHART
   
   

   Temperature Displayed	Proceed To
   -40°C (-40°F)	A
   140°C (284°F) or higher	B
   Same as actual IAT	C

   HINT:

   • If there is an open circuit, the intelligent tester indicates - 40°C (-40°F).
   • If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.

   B : GO TO STEP   5 

   C : CHECK FOR INTERMITTENT PROBLEMS 

   A : Go to next step 

3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect terminals THA of the MAF meter wire harness side connector.
   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch ON and turn the intelligent tester ON.
   5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
   6. Read the value.

   Standard temperature: 

   140°C (284°F) or more 

   OK : CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER 

   Fig 2: Identifying M1 MAF Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG 

4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect terminals THA and E2 of the E8 ECM connector.

      HINT:

      Before checking, perform visual and contact pressure checks on the ECM connector.

   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch ON.
   5. Turn the tester ON.
   6. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
   7. Read the value displayed on the tester.

   Standard temperature: 

   140°C (284°F) or higher 

   NG : CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 

   Fig 3: Connecting Terminals THA And E2 Of E8 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPAIR OR REPLACE HARNESS AND CONNECTOR 

5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch ON.
   4. Turn the tester ON.
   5. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
   6. Read the value displayed on the tester.

   Standard temperature: 

   -40°C (-40°F) 

   OK : REPLACE MASS AIR FLOW METER 

   Fig 4: Checking For Short In Wire Harness Of M1 MAF Meter

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG 

6. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM) 
   1. Disconnect the E8 ECM connector.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch ON.
   4. Turn the tester ON.
   5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR.
   6. Read the value displayed on the tester.

   Standard temperature: 

   -40°C (-40°F) 

   NG : REPLACE ECM 

   Fig 5: Disconnecting E8 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPAIR OR REPLACE HARNESS AND CONNECTOR