Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (The intake air temperature sensor circuit is open or shorted.)

• Intake air temperature sensor

FAIL-SAFE

Engine Control System

Not applicable

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

Confirmation Procedure

1. PRECONDITIONING

   If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

   >>

   GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

   1. Turn ignition switch ON and wait at least 5 seconds.

   2. 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 INTAKE AIR TEMPERATURE (IAT) SENSOR POWER SUPPLY-1

   1. Turn ignition switch OFF.

   2. Disconnect mass air flow (MAF) sensor (intake air temperature sensor is built-in) harness connector.

   3. Turn ignition switch ON.

   4. Check the voltage between MAF sensor harness connector terminals.

      MAF sensor			Voltage (Approx.)
      Connector	Terminal
      F31	1	3	5 V

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   GO TO 2.

2. CHECK IAT SENSOR POWER SUPPLY-2

   Check the voltage between MAF sensor harness connector and ground.

   +		−	Voltage (Approx.)
   MAF sensor
   Connector	Terminal
   F31	1	Ground	5 V

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   GO TO 3.

3. CHECK IAT SENSOR POWER SUPPLY CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

   3. Check the continuity between MAF sensor harness connector and ECM harness connector.

      MAF sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F31	1	F24	27	Existed

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

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure.

   NO >>

   Repair or replace malfunctioning part.

4. CHECK IAT SENSOR GROUND CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

   3. Check the continuity between MAF sensor harness connector and ECM harness connector.

      MAF sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F31	3	F24	23	Existed

   4. Also check harness for short to power.

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace malfunctioning part.

5. CHECK ECM GROUND CIRCUIT

   1. Check the continuity between ECM harness connector and ground.

      ECM		—	Continuity
      Connector	Terminal
      F24	5	Ground	Existed
      	65
      F25	69
      E16	157
      	159
      	162

   2. Also check harness for short to power.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Repair or replace malfunctioning part.

6. CHECK INTAKE AIR TEMPERATURE SENSOR

   Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Replace mass air flow (MAF) sensor (intake air temperature sensor is built-in). Refer to Exploded View.