P0053

DTC P0053: Heated Oxygen Sensor Heater Resistance (bank 1, sensor 1)






















CIRCUIT OPERATION

- Power is supplied from the MFI relay (terminal No. 2) to the right bank heated oxygen sensor (front) heater.

- The ECM (terminal No. 33) controls continuity to the right bank heated oxygen sensor
(front) heater by turning the power transistor in the ECM "ON" and "OFF".

TECHNICAL DESCRIPTION

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

DESCRIPTIONS OF MONITOR METHODS

Right bank heated oxygen sensor heater (front) current is out of specified range.

MONITOR EXECUTION

Continuous

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)

- Not applicable

DTC SET CONDITION

Logic Flow Chart






Check Conditions

- More than 60 seconds have passed since the engine starting sequence was completed.

- While the right bank heated oxygen sensor (front) heater is on.

- Battery positive voltage is between 11 and 16.5 volts.

- Intake air temperature is more than -10°C (14°F).

- On duty cycle of the right bank heated oxygen sensor (front) heater is between 3 and 97 percent.
Judgement Criterion

- The right bank heated oxygen sensor (front) heater current has continued to be lower than average 0.6 ampere for 10 seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 Monitors, Trips, Drive Cycles and Readiness Codes.

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

- Connector damage.

- Right bank heated oxygen sensor (front) heater failed.

- Harness damage

- ECM failed.

DIAGNOSIS

Required Special Tools:

- MB991316: Test Harness

STEP 1. Check harness connector A-33X at the MFI relay, harness connector B-03 at the right bank heated oxygen sensor (front) and harness connector B-10 at the ECM for damage.

Q. Is the harness connector in good condition?

YES Go to Step 2.
NO Repair or replace it. Harness Connector Inspection.
Then go to Step 6.
STEP 2. Check the right bank heated oxygen sensor (front).





(1)Disconnect right bank heated oxygen sensor (front) connector B-03 and connect test harness special tool, MB991316, to the connector on the right bank heated oxygen sensor (front) side.
(2)Measure the resistance between right bank heated oxygen sensor (front) connector terminal No. 1 (red clip) and terminal No. 3 (blue clip).
Standard value: 4.5 - 8.0 ohms [at 20°C (68°F)]

Q. Is the measured resistance between 4.5 and 8.0 ohms [at 20°C (68°F)]?

YES Go to Step 3.

NO Replace the right bank heated oxygen sensor (front). Then go to Step 6.

STEP 3.Check for harness damage between MFI relay connector A-33X and right bank heated oxygen sensor (front) connector B-03.

NOTE:
Check harness after checking intermediate connector A-13. If intermediate connector is damaged, repair or replace it. Harness Connector Inspection.
Then go to Step 6 .

(1)Disconnect the MFI relay connector A-33X and the right bank heated oxygen sensor
(front) connector B-03.





(2)Measure the resistance between the MFI relay connector A-33X (terminal No. 2) and the right bank heated oxygen sensor (front) connector B-03 (terminal No. 1).

- Should be less than 2 ohms.

Q. Is the harness wire in good condition?

YES Go to Step 4.

NO Repair it. Then go to Step 6.

STEP 4.Check for harness damage between right bank heated oxygen sensor
(front) connector B-03 and ECM connector B-10.

(1)Disconnect the right bank heated oxygen sensor (front) connector B-03 and the ECM connector B-10.





(2)Measure the resistance between the right bank heated oxygen sensor (front) connector B-03
(terminal No. 3) and the ECM connector B-10 (terminal No. 33).

- Should be less than 2 ohms.

Q. Is the harness wire in good condition?

YES Go to Step 5.

NO Repair it. Then go to Step 6.

STEP 5. 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 Monitors, Trips, Drive Cycles and Readiness Codes.

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

Q. Is DTC P0053 set?

YES Replace the ECM. When the ECM is replaced, register the ID code. Refer to ID registration procedure manual - ID codes registration judgement table [Vehicles with KOS] or ID registration procedure manual - ID codes registration judgement table [Vehicles with WCM]. Then go to Step 6.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
STEP 6. 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 Monitors, Trips, Drive Cycles and Readiness Codes.

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

Q. Is DTC P0053 set?

YES Retry the troubleshooting.
NO The inspection is complete.