PR25DD engine
WARNING: This page is about a different variant/trim than selected.
- 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
F44
4
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 2.
NO
Repair or replace error-detected parts.
- 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
F44
3
F90
126
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK A/F SENSOR 1 HEATER
Check the A/F sensor 1 heater. Refer to DTC Description .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection ..
NO
GO TO 4.
- REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to CATALYST : Exploded View .
INSPECTION END