Diagnostic Procedure

1. Stop engine.
2. Disconnect IACV-AAC valve harness connector.
3. Turn ignition switch ON.
   Fig 1: Locating IACV-AAC Valve Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between terminal 2 and engine ground with CONSULT-II or tester.

   Voltage: Battery voltage 

OK or NG 

1. OK: GO TO  3.
2. NG: GO TO 2.
   Fig 2: Checking Voltage Between Terminal 2 And Engine Ground

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

Check the following.

• Harness connectors M81, F36
• Harness connectors F37, F101
• Fuse block (J/B) connector M27
• 10A fuse
• Harness for open or short between IACV-AAC valve and fuse

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

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 101 and IACV-AAC valve terminal 1.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

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

OK or NG 

1. OK: GO TO  5.
2. NG: GO TO 4.

Check the following.

• Harness connectors F101, F37
• Harness for open or short between IACV-AAC valve and ECM

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

1. Disconnect IACV-AAC valve harness connector.
2. Remove IACV-AAC valve.
   • Check IACV-AAC valve resistance.

     Resistance: Approximately 10Ω [at 20°C (68°F)] 

   • Check plunger for seizing or sticking.
   • Check for broken spring.
   Fig 3: Checking IACV-AAC Valve Resistance

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Supply battery voltage between IACV-AAC valve connector terminals.

   Plunger should move. 

OK or NG 

1. OK: GO TO 6.
2. NG: Replace IACV-AAC valve.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END