Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK EXHAUST VALVE TIMING (EVT) CONTROL MAGNET RETARDER POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect EVT control magnet retarder harness connector.
Turn ignition switch ON.
Check the voltage between EVT control magnet retarder harness connector and ground.

TERMINAL CONNECTOR REFERENCE CHART

DTC	EVT control magnet retarder			Ground	Voltage
	Bank	Connector	Terminal
P0078	1	F32	1	Ground	Battery voltage
P0084	2	F33	1

Fig 1: Checking Voltage Between EVT Control Magnet Retarder Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: GO TO 2.

NO: Repair open circuit, short to ground or short to power in harness or connectors.

CHECK EVT CONTROL MAGNET RETARDER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between EVT control magnet retarder harness connector and ECM harness connector.

TERMINAL CONNECTOR REFERENCE CHART

DTC	EVT control magnet retarder			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0078	1	F32	2	F13	79	Existed
P0084	2	F33	2	F13	80	Existed

Also check harness for short to ground and short to power.
Is the inspection result normal?

YES: GO TO 3.

NO: Repair open circuit, short to ground or short to power in harness or connectors.

CHECK EVT CONTROL MAGNET RETARDER
Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: GO TO 5.

NO: GO TO 6.
REPLACE EVT CONTROL MAGNET RETARDER
1. Replace malfunctioning EVT control magnet retarder.
2. Perform "EXHAUST VALVE TIMING CONTROL LEARNING: SPECIAL REPAIR REQUIREMENT ".
: INSPECTION END
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

: INSPECTION END