DTC Diagnosis Procedure
1.
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.
+
−
Voltage
A/F sensor 1
Connector
Terminal
F18
4
Ground
Battery voltage
Is the inspection result normal?
.
Repair or replace error-detected parts.
2.
CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
+
−
Continuity
A/F sensor 1
ECM
Connector
Terminal
Connector
Terminal
F18
3
F51
6
Existed
Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair open circuit, short to ground or short to power in harness or connectors.
3.
CHECK A/F SENSOR 1 HEATER
Check the A/F sensor 1 heater. Refer to
Component Inspection
.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent Incident
Intermittent Incident
.
.
4.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to
Exploded View
.
:
INSPECTION END