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

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Wiring Diagram - Intake Air Temperature Circuit Malfunction

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. 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.

READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.

Read the value displayed on the tester.

Standard:

Same as 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 4

C: CHECK FOR INTERMITTENT PROBLEMS

A: Go to next step

READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the M1 Mass Air Flow (MAF) meter connector.
2. Connect terminals THA and E2 of the MAF meter wire harness side connector.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON.
5. Turn the tester ON.
6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
7. Read the value displayed on the tester.
  Standard:
  
  140°C (284°F) or higher
8. Reconnect the MAF meter connector.
  
  Fig 2: Identifying MAF Meter Connector (Open In Wire Harness)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER

NG: GO TO NEXT STEP
READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM (INCLUDED IN HV CONTROL ECU))
1. Disconnect the M1 MAF meter connector.
2. Connect terminals THA and E2 of the H32 HV Control ECU connector.
  HINT:
  
  Before checking, do visual and contact pressure checks on the HV Control ECU connector.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON.
5. Turn the tester ON.
6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
7. Read the value displayed on the tester.
  Standard:
  
  140°C (284°F) or higher
8. Reconnect the MAF meter connector.
  
  Fig 3: Identifying MAF Meter Connector (Open In ECM (Included In HV Control ECU))
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE HV CONTROL ECU
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. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
6. Read the value displayed on the tester.
  Standard:
  
  -40°C (-40°F) or higher
7. Reconnect the MAF meter connector.
  
  Fig 4: Identifying MAF Meter Connector (Short In Wire Harness)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE MASS AIR FLOW METER

NG: GO TO NEXT STEP
READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM (INCLUDED IN HV CONTROL ECU))
1. Disconnect the H32 HV Control ECU 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 / PRIMARY / INTAKE AIR.
6. Read the value displayed on the tester.
  Standard:
  
  -40°C (-40°F) or higher
7. Reconnect the HV Control ECU connector.
  
  Fig 5: Identifying MAF Meter Connector (Short In ECM (Included In HV Control ECU))
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPAIR OR REPLACE HARNESS AND CONNECTOR

NG: REPLACE HV CONTROL ECU