DTC    P0545    Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 1)

DTC    P0546    Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

for Preparation Click here


DESCRIPTION

The exhaust gas temperature sensors are installed before and after the CCo catalytic converter to sense the exhaust gas temperature.
A thermistor built into the sensor changes its resistance value according to the exhaust gas temperature. The lower the exhaust gas temperature, the greater the thermistor resistance value. The higher the exhaust gas temperature, the lower the thermistor resistance value.
The exhaust gas temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the exhaust gas temperature sensor from terminal THCI (B1S1) and THCO (B1S2) via resistor R.
The resistor R and the exhaust gas temperature sensor are connected in series. When the resistance value of the exhaust gas temperature sensor changes in accordance with changes in the exhaust gas temperature, the voltage at terminals THCI (B1S1) and THCO (B1S2) also changes.

P0545 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 2 seconds
Exhaust gas temperature sensor B1S1 output voltage is 0.15 V or less.
(1 trip detection logic)
  1. Open or short in exhaust gas temperature sensor B1S1 circuit
  2. Exhaust gas temperature sensor B1S1
  3. ECM

P0546 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Both of following conditions are met for 2 seconds:
  1. Engine coolant temperature is 80°C (176°F) or more.
  2. 11 minutes elapsed after engine start.
Exhaust gas temperature sensor B1S1 output voltage is 3.28 V or more.
(1 trip detection logic)
  1. Open or short in exhaust gas temperature sensor B1S1 circuit
  2. Exhaust gas temperature sensor B1S1
  3. ECM

Related Data List 
DTC No.
Data List
P0545
  1. Exhaust Temperature B1S1
P0546

HINT:
When DTC P0545 or P0546 is stored, check the exhaust gas temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1.

Temperature Displayed
Malfunction
20°C (68°F)
Open circuit
900°C (1652°F)
Short circuit


WIRING DIAGRAM


A199002E05


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 (EXHAUST TEMPERATURE B1S1)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and warm it up.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1.

  1. Read the value.

    Standard:
    Same as the actual exhaust gas temperature (50 to 700°C [122 to 1292°F] during idling after warm-up).

    Result 
    Result
    		Proceed to
    20°C (68°F)
    		A
    900°C (1652°F)
    		B
    Same as the actual exhaust gas temperature (50 to 700°C [122 to 1292°F] during idling after warm-up)
    		C

    HINT:
    1. If there is an open circuit, the intelligent tester indicates 20°C (68°F).
    2. If there is a short circuit, the intelligent tester indicates 900°C (1652°F).



B
Go to step 4

C
Go to step 11
A


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


    A200286E01

  1. Disconnect the exhaust gas temperature sensor B1S1 connector.

  1. Connect terminals THCI and ETCI of the exhaust gas temperature sensor (B1S1) 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 / Exhaust Temperature B1S1.

  1. Read the value.

    Standard:
    900°C (1652°F)

    Text in Illustration 
    *1
    		Exhaust Gas Temperature Sensor B1S1
    *2
    		Front view of wire harness connector
    (to Exhaust Gas Temperature Sensor B1S1)

  1. Reconnect the exhaust gas temperature sensor connector.



OK
Go to step 7

NG
Go to step 3

3.CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR B1S1 - ECM)

  1. Disconnect the exhaust gas temperature sensor B1S1 connector.



    A200287E07

  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
    B22-2 (THCI) - A19-50 (THCI)
    		Always
    		Below 1 Ω
    B22-1 (E2) - A19-51 (ETCI)
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Exhaust Gas Temperature Sensor B1S1)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the exhaust gas temperature sensor 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)


    A200307E04

  1. Disconnect the exhaust gas temperature sensor B1S1 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 / Exhaust Temperature B1S1.

  1. Read the value.

    Standard:
    20°C (68°F)

    Text in Illustration 
    *1
    		Exhaust Gas Temperature Sensor B1S1

  1. Reconnect the exhaust gas temperature sensor connector.



OK
Go to step 10

NG
Go to step 5

5.CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR B1S1 - ECM)

  1. Disconnect the exhaust gas temperature sensor B1S1 connector.



    A200287E08

  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
    B22-2 (THCI) or A19-50 (THCI) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Exhaust Gas Temperature Sensor B1S1)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the exhaust gas temperature sensor B1S1 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 EXHAUST GAS TEMPERATURE SENSOR B1S1

  1. Replace the exhaust gas temperature sensor B1S1 (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 EXHAUST GAS TEMPERATURE SENSOR B1S1

  1. Replace the exhaust gas temperature sensor B1S1 (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. Start the engine and wait until the engine coolant temperature is 80°C (176°F) or more.

  1. Confirm that 11 minutes or more elapsed after engine was started.

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

  1. Confirm that the DTC is not output again.


NEXT

END