Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0643 sensor power supply
DTC Logic

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause

P0643

 Sensor power supply circuit short ECM detects a voltage of power source for sensor is excessively low or high.
  • Harness or connectors (Accelerator pedal position 1 circuit is shorted.) (Throttle position sensor 1 circuit is shorted.) (Intake camshaft position sensor circuit is shorted.) (Exhaust camshaft position sensor circuit is shorted.) (Engine oil pressure sensor circuit is shorted.)
  • Accelerator pedal position sensor
  • Throttle position sensor
  • Intake camshaft position sensor
  • Exhaust camshaft position sensor
  • Engine oil pressure sensor

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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.

TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

  1. Start engine and let it idle for 1 second.
  2. Check DTC.

Is DTC detected?

YES >> Go to EC, "Diagnosis Procedure".

NO >> INSPECTION END

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