P2A00
P2A00 A/F SENSOR 1
DTC Logic
DTC DETECTION LOGIC
To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be shifted to LEAN side or RICH side.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Clear the mixture ratio self-learning value. Work Procedure.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.
4. Let engine idle for 1 minute.
5. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Proceed to SEE Diagnosis Procedure.
NO - INSPECTION END
Diagnosis Procedure
1.CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check harness connector for water.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace harness connector.
2.RETIGHTEN A/F SENSOR 1
Loosen and retighten the A/F sensor 1. Exploded View.
- GO TO 3.
3.CHECK FOR INTAKE AIR LEAK
1. Reconnect A/F sensor 1 harness connector.
2. Start engine and run it at idle.
3. Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES - GO TO 4.
NO - Repair or replace malfunctioning parts.
4.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Work Procedure.
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?
YES - Perform trouble diagnosis for DTC P0171 or P0172. P0171 or P0172, "DTC Logic".
NO - GO TO 5.
5.CHECK A/F SENSOR 1 POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES - GO TO 7.
NO - GO TO 6.
6.CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
4. Also check harness for short to ground.
Is the inspection result normal?
YES - Perform the trouble diagnosis for power supply circuit.
NO - Repair or replace error-detected parts.
7.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
5. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 8.
NO - Repair or replace error-detected parts.
8.CHECK A/F SENSOR 1 HEATER
Check the A/F sensor 1 heater. P0031.
Is the inspection result normal?
YES - GO TO 9.
NO - GO TO 10.
9.CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident.
Is the inspection result normal?
YES - GO TO 10.
NO - Repair or replace.
10.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. Exploded View.
CAUTION:
- Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J-43897-12)] and approved Anti-seize Lubricant (commercial service tool).
Do you have CONSULT-III?
YES - GO TO 11.
NO - GO TO 12.
11.CONFIRM A/F ADJUSTMENT DATA
With CONSULT-III
1. Turn ignition switch ON.
2. Select "A/F ADJ-B1" in "DATA MONITOR" mode of "ENGINE" using CONSULT-III.
3. Make sure that "0.000" is displayed on CONSULT-III screen.
Is "0.000" displayed?
YES - INSPECTION END
NO - GO TO 12.
12.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
Clear the mixture ratio self-learning value. Work Procedure.
Do you have CONSULT-III?
YES - GO TO 13.
NO - INSPECTION END
13.CONFIRM A/F ADJUSTMENT DATA
With CONSULT-III
1. Turn ignition switch ON.
2. Select "A/F ADJ-B1" in "DATA MONITOR" mode of "ENGINE" using CONSULT-III.
3. Make sure that "0.000" is displayed on CONSULT-III screen.
- INSPECTION END