PR25DD engine
- CHECK DTC PRIORITY
If DTC P0053 is displayed with the following DTC, perform the trouble diagnosis for the applicable DTC.
- P0130
- P0031
- P0032
If applicable DTC detected?
YES
Perform diagnosis of applicable.
- P0130: DTC Description
- P0031: DTC Description
- P0032: DTC Description
NO
GO TO 2.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9. Refer to Ground Inspection in Refer to Inspection .
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace ground connection.
- 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.
A/F sensor 1
Ground
Voltage
Connector
Terminal
F44
4
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 4.
- DETECT MALFUNCTIONING PART
Check the following.
- IPDM E/R harness connector F10
- 15A fuse (No. 55)
- Harness for open or short between A/F sensor 1 and fuse
Repair or replace harness or connectors.
- 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.
A/F sensor 1
ECM
Continuity
Connector
Terminal
Connector
Terminal
F44
3
F90
126
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 6.
NO
Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK A/F SENSOR 1 HEATER
Refer to Component Inspection .
Is the inspection result normal?
YES
GO TO 8.
NO
GO TO 7.
- REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. Refer to CATALYST : Exploded View .
INSPECTION END
- CHECK INTERMITTENT INCIDENT
Perform Refer to Inspection .
Repair or replace.