The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating condition to keep the temperature of A/F sensor 1 element within the specified range.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
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
Start engine and let it idle for at least 10 seconds.
Check 1st trip DTC. Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NG >> Inspection END
YES >> GO TO 2.
NO >> Repair or replace ground connection. 2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
Turn ignition switch ON.
Check the voltage between A/F sensor 1 harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3. 3.DETECT MALFUNCTIONING PART
Check the following.
IPDM E/R harness connector F10
15 A fuse (No. 37)
Harness for open or short between A/F sensor 1 and fuse >> Repair or replace harness or connectors.
4.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check harness continuity between A/F sensor 1 harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 5.CHECK A/F SENSOR 1 HEATER
Refer to Component Inspection.
Is the Inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6. 6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:
Discard any A/F 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 A/F sensor, clean exhaust system threads using Oxygen Sensor ThreadCleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).
Component Inspection 1.CHECK AIR FUEL RATIO (A/F) SENSOR 1
Check resistance between A/F sensor terminals as per the following.
Is the Inspection result normal?
YES >> Inspection END
NO >> GO TO 2.
2.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:
Discard any (A/F) 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 (A/F) sensor, clean exhaust system threads using Heated Oxygen SensorThread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).