Diagnosis Procedure

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to "WORK PROCEDURE ".
2. Run engine for at least 10 minutes at idle speed.
  Is the 1st trip DTC P0171 detected? Is it difficult to start engine?
  
  YES: Perform trouble diagnosis for DTC P0171. Refer to "DTC LOGIC ".
  
  NO: GO TO 2.

CHECK HO2S2 GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
Disconnect ECM harness connector.

Check the continuity between HO2S2 harness connector and ECM harness connector.

+		-		Continuity
HO2S2		ECM
Connector	Terminal	Connector	Terminal
F69	1	F25	33	Existed

Also check harness for short to power.
Is the inspection result normal?

YES: GO TO 3.

NO: Repair or replace error-detected parts.

CHECK HO2S2 INPUT SIGNAL CIRCUIT

Check the continuity between HO2S2 harness connector and ECM harness connector.

+		-		Continuity
HO2S2		ECM
Connector	Terminal	Connector	Terminal
F69	4	F25	29	Existed

Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.

+		-	Continuity
HO2S2
Connector	Terminal
F69	4	Ground	Not existed

+		-	Continuity
ECM
Connector	Terminal
F25	29	Ground	Not existed

Also check harness for short to power.
Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace error-detected parts.

CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

NO: GO TO 5.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2.
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 J43897-12)] and approved Anti-seize Lubricant (commercial service tool).
: INSPECTION END