P0144

DTC P0144 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 3)

HINT: This DTC has been added to meet the requirement for Partial Zero Emission Vehicle (PZEV).

CIRCUIT DESCRIPTION

DTC Detection Condition:

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

This sensor (heated oxygen sensor 3) is similar to the heated oxygen sensor 2, only difference between the two sensors is that this is not used to regulate the air-fuel ratio. The sensor is located after the rear catalyst (hydrocarbon (HC) absorptive catalyst) only to detect the deterioration in the catalyst.

In a circuit inside the ECM, impedance* of the heated oxygen sensor 3 is measured by the ECM. The ECM determines that there is a malfunction in the sensor when the measured impedance deviates from the standard range.

*: The effective resistance in an alternating current electrical circuit.

Wiring Diagram:

CONFIRMATION ENGINE RACING PATTERN for DTC P0144

PURPOSE






HINT: Performing this confirmation pattern will activate the DTC detection (P0144) of the ECM. This is very useful for verifying the completion of a repair.

a. Clear the DTCs.
1. Disconnect the battery cable remove the EFI and ETCS fuses for 60 seconds or more.

b. Start the engine and let the engine idle for 1 minute.
c. Read the DTC.

NOTE: If the conditions in this test are not strictly followed, detection of a malfunction will not occur.

Step 1 - 2:

Step 3:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.