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DTC P0161: Heated Oxygen Sensor Heater Circuit (Bank 2, Sensor 2)

The document describes DTC code P0161 related to the heated oxygen sensor heater circuit for bank 2, sensor 2 of a 2005 Mitsubishi Endeavor with a 3.8L engine. The PCM monitors the heater current of this sensor and will set the code if the current is outside the normal range of 0.16 to 5.0 amps. Troubleshooting steps include checking the sensor resistance, power supply voltages, and inspecting connectors for damage. Replacing the sensor or repairing wiring faults are provided as solutions.

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Willie Austine
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1K views14 pages

DTC P0161: Heated Oxygen Sensor Heater Circuit (Bank 2, Sensor 2)

The document describes DTC code P0161 related to the heated oxygen sensor heater circuit for bank 2, sensor 2 of a 2005 Mitsubishi Endeavor with a 3.8L engine. The PCM monitors the heater current of this sensor and will set the code if the current is outside the normal range of 0.16 to 5.0 amps. Troubleshooting steps include checking the sensor resistance, power supply voltages, and inspecting connectors for damage. Replacing the sensor or repairing wiring faults are provided as solutions.

Uploaded by

Willie Austine
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.

Endeavor (3.8L 6G75) • MotoLogic

2005 Endeavor (3.8L 6G75)

DTC P0161: Heated Oxygen Sensor Heater Circuit (bank 2, sensor Report a problem with this article
2)

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

CIRCUIT OPERATION

Power is supplied from the MFI relay (terminal No. 4) to the left bank heated oxygen sensor (rear)
heater.
The PCM (terminal No. 137) controls continuity to the left bank heated oxygen sensor (rear) heater by
turning the power transistor in the PCM "ON" and "OFF".

TECHNICAL DESCRIPTION

The PCM checks whether the heater current is within a specified range when the heater is energized.

DESCRIPTIONS OF MONITOR METHODS

Left bank heated oxygen sensor heater (rear) current is out of specified range when engine coolant
temperature is over 20°C (68°F).

MONITOR EXECUTION

Continuous

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

Not applicable
Sensor (The sensor below is determined to be normal)

Engine coolant temperature sensor

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

60 seconds have elapsed from the start of the engine previous monitoring.
Engine coolant temperature is higher than 20°C (68°F).
While the left bank heated oxygen sensor (rear) heater is on.
Battery positive voltage is between 11 and 16.5 volts.
Judgment Criterion

The left bank heated oxygen sensor (rear) heater current has continued to be lower than 0.16 ampere
or higher than 5.0 ampere for 4 seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

Open or shorted left bank heated oxygen sensor (rear) heater circuit, or harness damage.
Open circuit in left bank heated oxygen sensor (rear) heater.
Connector damage.
Left bank heated oxygen sensor (rear) failed.
PCM failed.

DIAGNOSIS

Required Special Tools:

MB991316: Test Harness


MB991923: Power Plant ECU Check Harness

STEP 1. Check harness connector B-24 at the left


bank heated oxygen sensor (rear) for damage.

Q. Is the harness connector in good condition?


YesGo to Step 2.

NoRepair or replace it. Refer to GROUP 00E, Harness


Connector Inspection

. Then go to Step 12.

STEP 2. Check the left bank heated oxygen sensor


(rear).

(1)Disconnect left bank heated oxygen sensor (rear) connector


B-24 and connect test harness special tool, MB991316, to the
connector on the left bank heated oxygen (rear) sensor side.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

(2)Measure the resistance between heated oxygen sensor


connector terminal No. 1 (red clip) and terminal No. 3 (blue clip).
Standard value: 11 - 18 ohms [at 20°C (68°F)]

Q. Is the measured resistance between 11 and 18


ohms [at 20°C (68°F)]?
YesGo to Step 3.

NoReplace the left bank heated oxygen sensor (rear). Then go


to Step 12.

STEP 3. Measure the power supply voltage at left


bank heated oxygen sensor (rear) harness side
connector B-24.

(1)Disconnect the connector B-24 and measure at the harness


side.
(2)Turn the ignition switch to the "ON" position.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

(3)Measure the voltage between terminal No. 1 and ground.

Voltage should be battery positive voltage.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is battery positive voltage (approximately 12


volts) present?
YesGo to Step 5.

NoGo to Step 4.

STEP 4. Check harness connector B-15X at the MFI


relay for damage.

Q. Is the harness connector in good condition?


YesRepair harness wire between MFI relay connector B-15X
(terminal No. 4) and left bank heated oxygen sensor (rear)
connector B-24 (terminal No. 1) because of open circuit or short
circuit to ground. Then go to Step 12.

NoRepair or replace it. Refer to GROUP 00E, Harness


Connector Inspection

. Then go to Step 12.

STEP 5. Measure the power supply voltage at PCM


connector B-22 by using power plant ECU check
harness special tool MB991923.

(1)Disconnect the all PCM connectors and connect power plant


ECU check harness special tool MB991923 between the
separated connectors.
(2)Turn the ignition switch to the "ON" position.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

(3)Measure the voltage between terminal No. 137 and ground.

Voltage should be battery positive voltage.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is battery positive voltage (approximately 12


volts) present?
YesGo to Step 8.

NoGo to Step 6.

STEP 6. Check harness connector B-22 at PCM for


damage.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

Q. Is the harness connector in good condition?


YesGo to Step 7.

NoRepair or replace it. Refer to GROUP 00E, Harness


Connector Inspection

. Then go to Step 12.

STEP 7. Check for open circuit or short circuit to


ground between left bank heated oxygen sensor
(rear) connector B-24 (terminal No. 3) and PCM
connector B-22 (terminal No. 137).

Q. Is the harness wire in good condition?


YesReplace the PCM. Then go to Step 12.

NoRepair it. Then go to Step 12.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

STEP 8. Check harness connector B-22 at PCM for


damage.

Q. Is the harness connector in good condition?


YesGo to Step 9.

NoRepair or replace it. Refer to GROUP 00E, Harness


Connector Inspection

. Then go to Step 12.

STEP 9. Check for harness damage between MFI


relay connector B-15X (terminal No. 4) and left bank
heated oxygen sensor (rear) connector B-24
(terminal No. 1).

Q. Is the harness wire in good condition?


YesGo to Step 10.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

NoRepair it. Then go to Step 12.

STEP 10. Check for harness damage between left


bank heated oxygen sensor (rear) connector B-24
(terminal No. 3) and PCM connector B-22 (terminal
No. 137).

Q. Is the harness wire in good condition?


YesGo to Step 11.

NoRepair it. Then go to Step 12.

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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

STEP 11. Check the trouble symptoms.

(1)Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function - OBD-II Drive Cycle - Pattern 2

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P0161 set?

YesReplace the PCM. Then go to Step 12.

NoIt can be assumed that this malfunction is intermittent. Refer


to GROUP 00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunctions
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8/1/2018 DTC P0161: Heated Oxygen Sensor Heater Circuit<Bank 2 Sensor 2> • 2005 Mitsubishi Endeavor (3.8L 6G75) • MotoLogic

STEP 12. Test the OBD-II drive cycle.

(1)Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function - OBD-II Drive Cycle - Pattern 2

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P0161 set?

YesRetry the troubleshooting.

NoThe inspection is complete.

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