Diagnosis Procedure
- CHECK DTC PRIORITY
If DTC P0053 is displayed with DTC 0031, 0032 or P0130, first perform the confirmation procedure (trouble diagnosis) for DTC 0031, 0032 or P0130.
Is DTC P0031, P0032 or P0130 detected?
YES
Perform diagnosis of applicable.
- P0130: Refer to DTC Description .
- P0031: Refer to DTC Description .
- P0032: Refer to DTC Description .
NO
GO TO 2.
- CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
- 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
F12
1
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 4.
NO
GO TO 3.
- CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
A/F sensor 1
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F12
1
F50
52
Existed
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
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 harness continuity between A/F sensor 1 harness connector and ECM harness connector.
A/F sensor 1
ECM
Continuity
Connector
Terminal
Connector
Terminal
F12
2
F13
6
Existed
- 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.
- CHECK A/F SENSOR 1 HEATER
Check A/F sensor 1 heater. Refer to Component Inspection .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to Removal and Installation (bank 2) , Removal and Installation (bank 1) .