Diagnosis Procedure

Diagnosis Procedure

ECM supplies a voltage of 5 V to some of the sensors systematically divided into 2 groups, respectively.Accordingly, when a short circuit develops in a sensor power source, a malfunction may occur simultaneouslyin the sensors belonging to the same group as the short-circuited sensor.

Sensor power supply 1

• APP sensor 1

• Crankshaft position sensor

• EGR volume control valve position sensor

• Exhaust camshaft position sensor

• Intake manifold runner control valve position sensor

• Manifold absolute pressure sensor

• Throttle position sensor

If sensor power supply 1 circuit is malfunctioning, DTC P0643 is displayed.

Sensor power supply 2

• APP sensor 2

• Intake camshaft position sensor

• Engine oil pressure sensor

• Fuel rail pressure sensor

• Mass air flow sensor

• Refrigerant pressure sensor

1. CHECK ACCELERATOR PEDAL POSITION SENSOR 2 POWER SUPPLY CIRCUIT-1

   1. Turn ignition switch OFF.

   2. Disconnect accelerator pedal position (APP) sensor harness connector.

   3. Turn ignition switch ON.

   4. Check the voltage between APP sensor harness connector and ground.

      +		−	Voltage (Approx.)
      APP sensor
      Connector	Terminal
      E12	5	Ground	5 V

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 2.

2. CHECK ACCELERATOR PEDAL POSITION SENSOR 2 POWER SUPPLY CIRCUIT-2

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

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

      APP sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E12	5	E16	152	Existed

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair or replace malfunctioning part.

3. CHECK SENSOR POWER SUPPLY 2 CIRCUIT

   Check harness for short to power and short to ground, between the following terminals.

   ECM		Sensor
   Connector	Terminal	Name	Connector	Terminal
   E16	152	APP sensor 2	E12	5
   F24	24	Intake camshaft position sensor	F39	1
   	27	Mass air flow sensor	F31	1
   	43	Refrigerant pressure sensor	E35	3
   		Engine oil pressure sensor	F2	3
   		Fuel rail pressure sensor	F101	1

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair or replace malfunctioning part.

4. CHECK COMPONENTS

   Check the following.

   • Accelerator pedal position sensor 2 (Refer to Component Inspection.)

   • Intake camshaft position sensor (Refer to Component Inspection.)

   • Engine oil pressure sensor (Refer to Component Inspection.)

   • Fuel rail pressure sensor (Refer to Component Inspection.)

   • Mass air flow sensor (Refer to Component Inspection.)

   • Refrigerant pressure sensor (Refer to Diagnosis Procedure.)

   Is the inspection result normal?

   YES >>

   Refer to Intermittent Incident.

   NO >>

   Replace malfunctioning part.