Start engine and warm to normal operating temperature. Set parking brake and let engine idle. While depressing brake pedal, shift transmission into Drive. Observe amount of body vibration. Increase engine speed to more than 1000 RPM. Disconnect front engine mount harness connector. See Fig 1.
Allow engine to idle. Observe amount of body vibration. If amount of body vibration does not increase to more than amount observed in step 1) , go to next step. If amount of body vibration increased to more than amount observed in step 1) , system is okay. Test is complete.
Turn ignition off. Measure voltage between ground and front engine mount harness connector White wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate diagram in WIRING DIAGRAMS article.
Disconnect PCM harness connector. See Figure. Check continuity of White/Red wire between front engine mount harness connector and PCM harness connector terminal No. 34. See Figure. Also check continuity of White/Blue wire between front engine mount harness connector and PCM harness connector terminal No. 33. If continuity exists, go to next step. If continuity does not exist, repair open circuit.
No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. Visually inspect front engine mount. Replace if damaged.

Fig 1: Locating Front Engine Mount Harness Connector (I30)

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

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Front Engine Mount Control - I30