DTC Logic
DTC DETECTION LOGIC
To judge the malfunction of A/F sensor 1, this diagnosis measures response time of the A/F signal computed by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or not.
DTC No. | CONSULT screen terms (Trouble diagnosis content) | DTC detecting condition | Possible cause |
P014C | A/F SENSOR1 (B1) (O2 sensor slow response - rich to lean bank 1 sensor 1) | The response time of a A/F sensor 1 signal delays more than the specified time computed by ECM. |
|
P014D | A/F SENSOR1 (B1) (O2 sensor slow response - lean to rich bank 1 sensor 1) |
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
Do you have CONSULT? YES >> GO TO 2.
NO >> GO TO 6.
2.PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
NOTE:
If “PRSNT” changed to “ABSNT”, refer to EC-211, "Component Function Check".
Is“PRSNT” displayed on CONSULT screen? YES >> GO TO 4
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
Perform DTC confirmation procedure-1 again.
Is “PRSNT” displayed on CONSULT screen? YES >> GO TO 4.
NO >> Proceed to EC-211, "Component Function Check".
4.PERFORM DTC CONFIRMATION PROCEDURE-3
With CONSULT
NOTE:
If “CMPLT” changed to “INCMP”, refer to EC-211, "Component Function Check".
Is “CMPLT” displayed on CONSULT screen? YES >> GO TO 5.
NO >> Refer to EC-211, "Component Function Check".
5.PERFORM SELF-DIAGNOSIS
With CONSULT
Check the “SELF-DIAG RESULT”.
Is any DTC detected? YES >> Proceed to EC-240, "Diagnosis Procedure".
NO >> INSPECTION END
6.CHECK AIR-FUEL RATIO SELF-LEARNING VALUE
With GST
Is the total percentage within В±15%? YES >> GO TO 8.
NO >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
>> Repair or replace malfunctioning part.
8.PERFORM DTC CONFIRMATION PROCEDURE
Is 1st trip DTC detected? YES >> Proceed to EC-240, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.RETIGHTEN A/F SENSOR 1
Loosen and retighten the A/F sensor 1. Refer to EM-30, "Exploded View".
>> GO TO 2.
2.CHECK EXHAUST GAS LEAK
Is exhaust gas leak detected? YES >> Repair or replace error-detected parts.
NO >> GO TO 3.
3.CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected? YES >> Repair or replace error-detected parts.
NO >> GO TO 4.
4.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? YES >> • Perform trouble diagnosis for DTC P0171. Refer to EC-246, "DTC Logic".
• Perform trouble diagnosis for DTC P0172. Refer to EC-250, "DTC Logic".
NO >> GO TO 5.
5.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
*1: Except California
*2: For California
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 11.
6.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
*1: Except California
*2: For California
*1: Except California
*2: For California
Is the inspection result normal? YES >> GO TO 7.
NO >> Repair or replace error-detected parts.
7.CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Check the air fuel ratio (A/F) sensor 1 heater. Refer to EC-242, "Component Inspection (A/F Sensor 1 Heater)".
Is the inspection result normal? YES >> GO TO 8.
NO >> Replace air fuel ratio (A/F) sensor 1. Refer to EM-30, "Exploded View".
8.CHECK MASS AIR FLOW SENSOR
Check the mass air flow sensor. Refer to EC-242, "Component Inspection (MAF Sensor)".
Is the inspection result normal? YES >> GO TO 9.
NO >> Replace mass air flow sensor. Refer to EM-25, "Exploded View".
9.CHECK PCV VALVE
Check the PCV valve. Refer to EC-484, "Inspection".
Is the inspection result normal? YES >> GO TO 10.
NO >> Repair or replace PCV valve. Refer to EC-15, "ENGINE CONTROL SYSTEM : Component Parts Location".
10.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to GI-39, "Intermittent Incident".
Is the inspection result normal? YES >> Replace air fuel ratio (A/F) sensor 1. Refer to EM-30, "Exploded View".
NO >> Repair or replace error-detected parts.
11.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
*1: Except California
*2: For California
Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
Component Inspection (A/F Sensor 1 Heater)
1.CHECK AIR FUEL RATIO (A/F) SENSOR 1
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace air fuel ratio (A/F) sensor 1. Refer to EM-30, "Exploded View".
Component Inspection (MAF Sensor)
1.CHECK MASS AIR FLOW SENSOR-1
With CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal? YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK FOR THE CAUSE OF UNEVEN AIR FLOW THROUGH MASS AIR FLOW SENSOR
Is the inspection result normal? YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK MASS AIR FLOW SENSOR-2
With CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal? YES >> INSPECTION END
NO >> GO TO 4.
4.CHECK MASS AIR FLOW SENSOR-3
With CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Without CONSULT
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
Is the inspection result normal? YES >> INSPECTION END
NO >> Clean or replace mass air flow sensor. Refer to EM-25, "Exploded View".
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