Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)

• The A/F sensor 1 heater

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

1. CHECK DTC PRIORITY

   If DTC P0053 is displayed with DTC P0031, P0032 or P0130, first perform the confirmation procedure (trouble diagnosis) for DTC P0031, P0032 or P0130.

   Is DTC P0031, P0032 or P0130 detected?

   YES >>

   Perform diagnosis of applicable.

   • P0031: Refer to DTC Description.

   • P0032: Refer to DTC Description.

   • P0130: Refer to DTC Description.

   NO >>

   GO TO 2.

2. PRECONDITIONING

   When DTC Confirmation Procedure has been preciously conducted, always perform the following before conducting the next test.

   1. Turn ignition switch OFF and wait at least 10 seconds.

   2. Turn ignition switch ON.

   3. Turn ignition switch OFF and wait at least 10 seconds.

   TEST CONDITION:

   Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

   >>

   GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE

   1. Start the engine and warm it up until the engine coolant temperature reaches 25°C (77°F) or more.

   2. Keep the engine at idle at least 35 seconds.

   3. Check 1st trip DTC.

   Is 1st trip DTC detected?

   YES >>

   Proceed to DTC Diagnosis Procedure.

   NO-1 >>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO-2 >>

   Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

1. CHECK DTC PRIORITY

   If DTC P0053 is displayed with DTC P0031, P0032 or P0130, first perform the confirmation procedure (trouble diagnosis) for DTC P0031, P0032 or P0130.

   Is DTC P0031, P0032 or P0130 detected?

   YES >>

   Perform diagnosis of applicable.

   • P0031: Refer to DTC Description.

   • P0032: Refer to DTC Description.

   • P0130: Refer to DTC Description.

   NO >>

   GO TO 2.

2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

   1. Turn ignition switch OFF.

   2. Disconnect air fuel ratio (A/F) sensor 1 harness connector.

   3. Turn ignition switch ON.

   4. Check the voltage between A/F sensor 1 harness connector and ground.

      +		−	Voltage
      A/F sensor 1
      Connector	Terminal
      F12	4	Ground	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   GO TO 4.

3. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect IPDM E/R harness connector.

   3. 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	4	F96	75	Existed

   Is the inspection result normal?

   YES >>

   Perform the trouble diagnosis for power supply circuit.

   NO >>

   Repair or replace malfunctioning part.

4. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

   3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

      A/F sensor 1		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F12	3	F25	126	Existed

   4. Also check harness for short to ground and short to power.

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace malfunctioning part.

5. CHECK A/F SENSOR 1 HEATER

   Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 6.

6. REPLACE A/F SENSOR 1

   Replace A/F sensor 1. Refer to Exploded View.

   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.

   >>

   INSPECTION END