Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0078 EVT control solenoid valve
Diagnosis Procedure

1.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect exhaust valve timing (EVT) control solenoid valve harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between exhaust valve timing control solenoid valve harness connector and ground.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY

Is the inspection result normal?

YES >> GO TO 3.

NO >> GO TO 2.

2.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R harness connector.
  3. Check the continuity between EVT control solenoid valve harness connector and IPDM E/R harness connector.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

    4.   Also check harness for short to ground.

Is the inspection result normal?

YES >> Perform the trouble diagnosis for power supply circuit.

NO >> Repair or replace errordetected parts.

3.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between EVT control solenoid valve harness connector and ECM harness connector.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE GROUND CIRCUIT

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

Is the inspection result normal?

YES >> GO TO 4.

NO >> Repair or replace errordetected parts.

4.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE

Check the exhaust valve timing control solenoid valve. Refer to EM, "Exploded View".

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".

NO >> Replace exhaust valve timing control solenoid valve.

    More about «P0078 EVT control solenoid valve»:

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    Diagnosis Procedure

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