Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OVERALL FUNCTION
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select "ENGINE MOUNTING" in "ACTIVE TEST" mode with CONSULT-III and touch "ON/OFF" on the CONSULT-III screen.
3. Check that the motor operating sound is heard from front electronic controlled engine mount for about 0.5 seconds according to the switching condition of "ENGINE MOUNTING".
Without CONSULT-III
1. Make sure that gear position is P or N.
2. Start engine and let it idle.
3. Change the engine speed from idle to more than 1, 000 rpm and then return to idle (with vehicle stopped).
4. Check that the motor operating sound is heard from front electronic controlled engine mount for about 0.5 seconds when changing engine speed.
  It is better to hear the operating sound around the left side front wheel house.
OK or NG

OK: INSPECTION END

NG: GO TO 2.
CHECK ELECTRONIC CONTROLLED ENGINE MOUNT POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect electronic controlled engine mount harness connector.
  
  Fig 1: Identifying Electronic Controlled Engine Mount Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between electronic controlled engine mount terminal 3 and ground with CONSULT-III or tester.
  Voltage: Battery voltage
OK or NG

OK: GO TO 4.

NG: GO TO 3.

Fig 2: Checking Voltage Between Electronic Controlled Engine Mount Terminal 3 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E8, F17
- Fuse block (J/B) connector E30
- 15A fuse
- Harness for open and short between electronic controlled engine mount and battery
: Repair harness or connectors.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check harness continuity between ECM terminals and electronic engine mount terminals as follows. Refer to WIRING DIAGRAM .

CONNECTOR TERMINAL CONTINUITY SPECIFICATION

ECM terminal	Electronic controlled engine mount terminal
8	1
9	2

Continuity should exist.

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

OK or NG

OK: GO TO 5.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT
Visually check electronic controlled engine mount.

OK or NG

OK: GO TO 6.

NG: Replace electronic controlled engine mount.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END