DTC Description

To judge malfunctions, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal fluctuates according to fuel feedback control.

DTC DETECTION LOGIC

DTC		CONSULT screen terms(Trouble diagnosis content)	DTC detection condition
P2252	00	O2 sensor bank 1 sensor 1(O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1)	Diagnosis condition	-
			Signal (terminal)	A/F sensor 1 signal
			Threshold	The output voltage computed by ECM according to the A/F sensor 1 signal is constant.
			Diagnosis delay time	-

POSSIBLE CAUSE

Harness or connectors (The A/F sensor 1 circuit is open or shorted.)
A/F sensor 1

FAIL-SAFE

Not applicable

PERFORM DTC CONFIRMATION PROCEDURE

PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

Will CONSULT be used?

>>

GO TO 2.

>>

GO TO 6.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT
1. Start the engine and warm it up to normal operating temperature.
2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode of "ENGINE" with CONSULT.
3. Check "A/F SEN1 (B1)" indication.
Does the indication constantly fluctuate around 2.2 V?

>>

GO TO 3.

>>

Proceed to Diagnosis Procedure .

PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT

Select "A/F SEN1 (B1) P1276" of "A/F SEN1" in "DTC WORK SUPPORT" mode of "ENGINE" using CONSULT.

"TESTING" is displayed on the CONSULT screen when the following conditions are met.

ENG SPEED	850 - 2, 300 rpm
VHCL SPEED SE	More than 64 km/h (40 mph)
B/FUEL SCHDL	1.0 - 8.0 msec
Selector lever	D position

CAUTION:

Always drive vehicle at a safe speed.

Is "TESTING" displayed on CONSULT screen?

GO TO 4.

If "TESTING" is not displayed after 20 seconds, GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-2
1. Release accelerator pedal fully.
  NOTE: Never operate brake pedal when releasing the accelerator pedal.
2. Confirm that "TESTING" change to "COMPLETED".
Is "COMPLETED" displayed on CONSULT screen?

>>

GO TO 5.

OUT OF CONDITION>>

GO TO 3.
PERFORM DTC CONFIRMATION PROCEDURE-3
Touch "SELF - DIAG RESULT".

Is "OK" displayed on CONSULT screen?

>>

To check malfunction symptom before repair: Refer to Intermittent Incident .

>>

Confirmation after repair: INSPECTION END

>>

"NG" proceed to Diagnosis Procedure .
PERFORM COMPONENT FUNCTION CHECK
Without CONSULT

NOTE: Use component function check to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC might not be confirmed.
1. Start the engine and warm it up to normal operating temperature.
2. Shift the lever to suitable position and drive for a few minutes at 80 km/h (50 MPH).
  CAUTION:
  Always drive vehicle at a safe speed.
3. Release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (31 MPH).
  NOTE: Never apply brake when releasing the accelerator pedal.
4. Repeat steps 2 and 3, 5 times.
5. Stop the vehicle, turn ignition switch OFF and wait at least 10 seconds.
6. Restart the engine.
7. Repeat steps 2 and 3, 5 times.
8. Stop the vehicle and Check 1st trip DTC.
Is 1st trip DTC detected?

>>

Proceed to Diagnosis Procedure .

>>

To check malfunction symptom before repair: Refer to Intermittent Incident .

>>

Confirmation after repair: INSPECTION END