DTC    P007C    Charge Air Cooler Temperature Sensor Circuit Low

DTC    P007D    Charge Air Cooler Temperature Sensor Circuit High

for Preparation Click here


DESCRIPTION

The Intake Air Temperature (IAT) sensor is mounted on the charge air cooler duct and senses the IAT.
A built-in thermistor in the sensor changes its resistance value according to the intake air temperature.
The lower the intake air temperature, the greater the thermistor resistance value. The higher the intake air temperature, the lower the thermistor resistance value (See Fig. 1).
The sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the sensor from terminal THIA via resistor R. Resistor R and the sensor are connected in series. When the resistance value of the sensor changes in accordance with changes in the IAT, the potential at terminal THIA also changes. Based on this signal, the ECM corrects the fuel injection volume to improve drivability with a cold engine.
A067628E13

P007C 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 2 seconds
Intake air temperature sensor output voltage is 0.05 V or less.
(1 trip detection logic)
  1. Open in intake air temperature sensor circuit
  2. Intake air temperature sensor
  3. ECM

P007D 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 2 seconds
Intake air temperature sensor output voltage is 3.1 V or more.
(1 trip detection logic)
  1. Short in intake air temperature sensor circuit
  2. Intake air temperature sensor
  3. ECM

Related Data List 
DTC No.
Data List
P007C
  1. Intake Air Temp (Turbo)
P007D

HINT:
  1. If DTC P007C or P007D is stored, the following symptoms may appear:
    1. Misfire
    2. Combustion noise
    3. Black smoke
    4. White smoke
    5. Lack of power
  2. When DTC P007C or P007D is stored, check the intake air temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).


Temperature Displayed
Malfunction
-30°C (-22°F) or less
Open circuit
149°C (300°F) or more
Short circuit

WIRING DIAGRAM


A199002E26


INSPECTION PROCEDURE

NOTICE:
When replacing the ECM, the ECM needs Registration and Initialization (Click here).

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. Read freeze frame data using the intelligent tester. 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, and other data from the time the malfunction occurred.

1.READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMP [TURBO])

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

  1. Read the value.

    OK:
    Same as actual intake air temperature.

    Result 
    Result
    		Proceed to
    -30°C (-22°F) or less
    		A
    149°C (300°F) or more
    		B
    Same as actual intake air temperature
    		C

    HINT:
    1. If there is an open circuit, the intelligent tester indicates -30°C (-22°F) or less.
    2. If there is a short circuit, the intelligent tester indicates 149°C (300°F) or more.



B
Go to step 4

C
Go to step 11
A


2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    A200306E05

  1. Disconnect the intake air temperature sensor connector.
    Text in Illustration 
    *1
    		Intake Air Temperature Sensor
    *2
    		Front view of wire harness connector
    (to Intake Air Temperature Sensor)

  1. Connect terminals 1 and 2 of the intake air temperature sensor wire harness side connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    Standard:
    149°C (300°F) or more

  1. Reconnect the intake air temperature sensor connector.



OK
Go to step 7

NG
Go to step 3

3.CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)


    A199028E11

  1. Disconnect the intake air temperature sensor connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A47-2 - B9-8 (THIA)
    		Always
    		Below 1 Ω
    A47-1 - B9-7 (ETHI)
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Intake Air Temperature Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the intake air temperature meter connector.

  1. Reconnect the ECM connector.



OK
Go to step 9

NG
Go to step 8

4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    A200307E06

  1. Disconnect the intake air temperature sensor connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    Standard:
    -30°C (-22°F) or less

    Text in Illustration 
    *1
    		Intake Air Temperature Sensor

  1. Reconnect the intake air temperature sensor connector.



OK
Go to step 10

NG
Go to step 5

5.CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)


    A199028E12

  1. Disconnect the intake air temperature sensor connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A47-2 or B9-8 (THIA) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Intake Air Temperature Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the intake air temperature sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


6.REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 11

7.CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE INTAKE AIR TEMPERATURE SENSOR

  1. Replace the intake air temperature sensor (Click here).



NEXT
Go to step 11

8.REPAIR OR REPLACE HARNESS OR CONNECTOR


NEXT
Go to step 11

9.CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 11

10.REPLACE INTAKE AIR TEMPERATURE SENSOR

  1. Replace the intake air temperature sensor (Click here).


NEXT


11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off and wait for 30 seconds or more.

  1. Turn the ignition switch to ON and wait for 10 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END